replaced Graziosi placeholders
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Rich Braman
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# GTBOP Moodle Quiz
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## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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### Dr. Ignazio Graziosi — January 15, 2026
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**Source:** Corrected SRT transcript (Stage 1) + Archive Package (Stage 2)
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**Questions:** 15
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**Difficulty Distribution:** 6 Recall (40%) | 6 Application (40%) | 3 Analysis (20%)
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**Coverage:** Disease triangle/decline spiral (Q1–Q3), EAB (Q4–Q8), CMBS (Q9–Q12), Orange-striped oakworm (Q13–Q15)
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---
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### Question 1
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**Timestamp Reference:** 1:28 – 2:32
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**Difficulty:** Recall
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According to Dr. Graziosi, the disease triangle describes the interaction of which three components that together cause tree damage?
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a) Pest, pathogen, and predator
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b) Pest, host tree, and environment
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c) Climate, soil, and genetics
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d) Insects, fungi, and nematodes
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**Correct Answer:** b
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**Explanation:** Dr. Graziosi introduced the disease triangle as the interaction of the pest, the tree (host), and the environment, emphasizing that the pest alone is not sufficient to cause damage.
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**Source in transcript:** ~2:04–2:32, blocks 33–35
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---
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### Question 2
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**Timestamp Reference:** 3:02 – 5:58
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**Difficulty:** Recall
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In the spiral of tree decline diagram, which of the following is classified as a predisposing factor?
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a) Defoliating insects
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b) Wood-boring insects
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c) Soil compaction
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d) Fungal pathogens
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi identified soil compaction as a predisposing factor in the outermost spiral, calling it "often the number one issue for many trees." Defoliating insects are inciting factors, and wood-boring insects and fungi are contributing factors.
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**Source in transcript:** ~4:08–4:31, blocks 49–52
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---
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### Question 3
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**Timestamp Reference:** 5:04 – 6:06
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**Difficulty:** Analysis
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Dr. Graziosi explained that in the spiral of tree decline, each spiral level contains factors that can "cut through" directly to tree death. What is the practical significance of this for a tree care professional?
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a) Only contributing factors can kill a tree
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b) A single stressor from any level can be severe enough to kill a tree on its own, without the other factors
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c) Trees can only die when all three levels of stressors are present simultaneously
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d) Predisposing factors must always precede inciting factors before decline begins
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**Correct Answer:** b
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**Explanation:** Dr. Graziosi specifically demonstrated that individual factors from any spiral level — for example, urban environment alone or soil compaction alone — can cut through the different layers and bring the tree directly to death, without requiring all other stressor levels to be present.
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**Source in transcript:** ~5:32–5:54, blocks 64–66
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---
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### Question 4
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**Timestamp Reference:** 8:23 – 9:10
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**Difficulty:** Recall
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Which of the following is a key diagnostic sign that a tree is being attacked by the emerald ash borer?
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a) Sooty mold on branches
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b) Skeletonized leaves
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c) Water sprouts on the trunk
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d) Pink egg masses on bark
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi described water sprouts as "a very important diagnostic feature in order to understand if a tree is attacked by the emerald ash borer," noting they are the tree's desperate attempt to produce new growth in response to larval damage under the bark.
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**Source in transcript:** ~8:56–9:10, blocks 98–100
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---
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### Question 5
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**Timestamp Reference:** 10:04 – 10:47
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**Difficulty:** Recall
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What is the characteristic shape of the exit hole left by an adult emerald ash borer emerging from a tree?
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a) Circular
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b) Oval
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c) D-shaped
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d) T-shaped
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi described the "very characteristic, the famous D-shaped exit hole" left when the adult beetle emerges from the tree.
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**Source in transcript:** ~10:11–10:15, block 110
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---
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### Question 6
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**Timestamp Reference:** 10:48 – 11:42
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**Difficulty:** Application
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A landscape manager in southern Georgia discovers EAB in local ash trees and plans a treatment schedule based on a single annual emergence. Based on Dr. Graziosi's presentation, what important consideration might this manager be overlooking?
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a) EAB only emerges every two years in all locations
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b) A portion of the local EAB population may require two years to develop, meaning adults could emerge in both years
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c) EAB does not complete its life cycle in southern climates
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d) EAB only feeds on ash trees in northern states
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**Correct Answer:** b
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**Explanation:** Dr. Graziosi explained that while EAB is mostly a one-generation-per-year insect, there is always a portion of the population that requires two years to develop. This is more pronounced at northern latitudes but occurs in any location, and it is important to know when planning control.
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**Source in transcript:** ~10:48–11:42, blocks 116–124
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---
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### Question 7
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**Timestamp Reference:** 13:02 – 13:46
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**Difficulty:** Recall
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According to the presentation, what was the single most important factor responsible for the rapid spread of the emerald ash borer across North America?
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a) Natural flight dispersal
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b) Nursery stock trade
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c) Movement of infested firewood
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d) Wind currents carrying adult beetles
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi identified firewood as the primary culprit, explaining that campers and travelers moved infested firewood, and researchers were able to connect the pattern of EAB spread closely with the highway and freeway system.
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**Source in transcript:** ~13:00–13:46, blocks 136–141
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---
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### Question 8
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**Timestamp Reference:** 15:26 – 16:44
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**Difficulty:** Application
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An arborist inventorying trees in a Georgia neighborhood finds that all the ash trees have been killed by EAB but notices white fringetrees appear healthy. Based on Dr. Graziosi's presentation, should the arborist be concerned about EAB affecting the white fringetrees?
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a) No, because white fringetrees are not in the same plant family as ash
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b) No, because EAB only attacks ash species
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c) Yes, because white fringetree was discovered to be an alternate host for EAB and could serve as a population reservoir
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d) Yes, but only if the white fringetrees are under drought stress
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi explained that in 2014 it was discovered that EAB could expand its host range to attack white fringetree (same family, Oleaceae). More importantly, white fringetree can function as a reservoir for EAB populations even after all ash trees in an area are gone.
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**Source in transcript:** ~15:26–16:44, blocks 162–172
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---
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### Question 9
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**Timestamp Reference:** 31:47 – 33:28
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**Difficulty:** Application
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A pest control operator inspects a crapemyrtle in December and finds both mature adult females and small mobile nymphs on the bark. Based on the presentation, is this finding unusual?
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a) Yes, all CMBS should be in a dormant stage during winter
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b) Yes, nymphs should only be present during summer months
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c) No, CMBS has overlapping generations, so multiple life stages can be present at any time of year
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d) No, but only adults should be present — the nymphs are likely a different insect
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi explained that CMBS can have up to five overlapping generations, meaning different stages of the insect can be found at any point. He showed a photo taken in Athens one month prior (winter) that contained both nymphs (crawlers) and adults.
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**Source in transcript:** ~33:10–33:47, blocks 327–329
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---
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### Question 10
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**Timestamp Reference:** 36:42 – 37:17
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**Difficulty:** Analysis
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Dr. Graziosi discussed urban heat island effects in relation to crapemyrtle bark scale. Which of the following best explains why urban heat islands create a "double advantage" for scale insects?
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a) Heat kills natural enemies while attracting more scales to the area
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b) Heat increases tree growth rate, providing more food for scales
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c) Heat stresses the host tree, increasing its susceptibility, while simultaneously accelerating the insect's development
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d) Heat causes scales to produce more sooty mold, which protects them from predators
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi described two specific effects of urban heat islands: first, it stresses trees, making them more susceptible to pests; second, it accelerates the development of the insect itself. He noted that scales are particularly good at taking advantage of urban heat.
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**Source in transcript:** ~36:57–37:21, blocks 363–368
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---
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### Question 11
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**Timestamp Reference:** 38:06 – 38:29
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**Difficulty:** Application
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A landscape company wants to use trunk injection of systemic insecticides to control a crapemyrtle bark scale infestation. Based on the presentation, what should they know?
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a) Trunk injection is the most effective method for CMBS control
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b) Trunk injection works but must be applied in fall
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c) Trunk injection is not a viable option because crapemyrtle absorbs systemic insecticides through the trunk very slowly
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d) Trunk injection is effective only on trees over 6 inches in diameter
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi specifically stated that chemical control of CMBS is complicated by the fact that crapemyrtle is not good at absorbing systemic insecticide through trunk injection, and that the chemical moves very slowly, making it not a viable option.
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**Source in transcript:** ~38:14–38:30, blocks 378–380
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---
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### Question 12
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**Timestamp Reference:** 38:31 – 41:44
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**Difficulty:** Recall
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Which of the following is NOT one of the native predators Dr. Graziosi identified as feeding on crapemyrtle bark scale?
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a) Twice-stabbed lady beetle
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b) Green lacewing
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c) Bigeminal lady beetle
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d) Parasitoid wasp specialist from Asia
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**Correct Answer:** d
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**Explanation:** Dr. Graziosi identified three lady beetle species (twice-stabbed, bigeminal, and Harlequin) and green lacewings (particularly the red-lipped green lacewing) as predators of CMBS in North America. He specifically noted that no effective parasitoid had yet been found for CMBS in the US, unlike the situation in Asia.
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**Source in transcript:** ~38:48–41:00, blocks 385–409
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---
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### Question 13
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**Timestamp Reference:** 42:25 – 43:35
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**Difficulty:** Recall
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According to the presentation, the orange-striped oakworm moth primarily feeds on which group of trees?
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a) Ash species
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b) Crapemyrtles
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c) Red oaks, but also hickory, birch, and maple
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d) Pines and other conifers
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi described the orange-striped oakworm as a well-known pest of oaks, especially red oaks, but noted it can also feed on hickory, birch, and maple.
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**Source in transcript:** ~42:43–42:59, blocks 422–423
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---
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### Question 14
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**Timestamp Reference:** 44:51 – 46:10
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**Difficulty:** Analysis
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Dr. Graziosi discussed Nuttall oaks on the UGA Athens campus as an example of vulnerability to the orange-striped oakworm. What underlying principle does this example illustrate about urban tree pest management?
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a) Nuttall oaks are a non-native species poorly adapted to Georgia
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b) Monoculture plantings of clonal nursery stock create genetically uniform populations where susceptibility in one tree means susceptibility in all
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c) Nuttall oaks are particularly attractive to oakworm moths due to their leaf chemistry
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d) Older trees are always more resistant to defoliating insects than younger ones
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**Correct Answer:** b
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**Explanation:** Dr. Graziosi explained that urban trees often come from nurseries as clonal trees with very low genetic variability — "they are basically the same tree." Therefore the susceptibility of one tree reflects the susceptibility of all trees of that clone on campus, making them uniformly vulnerable.
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**Source in transcript:** ~45:00–46:05, blocks 452–460
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---
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### Question 15
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**Timestamp Reference:** 47:56 – 49:05
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**Difficulty:** Application
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A homeowner calls about an oak tree losing leaves in late September to orange-striped oakworm caterpillars. About 30% of the canopy has been defoliated. Based on Dr. Graziosi's decision framework, what is the most appropriate recommendation?
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a) Immediately apply a broad-spectrum systemic insecticide via soil drench
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b) Apply Btk foliar spray urgently before the tree dies
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c) Consider that late-season defoliation is less harmful because the tree has already stored nutrients, and monitor rather than treat aggressively
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d) Remove and replace the tree, as 30% defoliation is always fatal
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi outlined two key considerations: the 25% defoliation threshold distinguishes aesthetic from actual damage, and late-season defoliation (even if substantial) is less harmful because the tree has already stored its nutrients. A mature oak at 30% defoliation in late September, while above the threshold, benefits from the seasonal timing, suggesting monitoring may be more appropriate than aggressive chemical intervention.
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**Source in transcript:** ~48:05–48:44, blocks 482–486
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---
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## Verification Checklist
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- [x] All 15 questions derived exclusively from presentation content
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- [x] Timestamp references verified against corrected transcript
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- [x] No external knowledge required to answer correctly
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- [x] Difficulty distribution: 6 Recall / 6 Application / 3 Analysis
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- [x] Coverage spans early (disease triangle), middle (EAB, CMBS), and late (oakworm) content
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- [x] Answer keys unambiguous based on speaker's statements
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- [x] Distractors plausible but clearly incorrect per presentation
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- [x] No "all of the above" or "none of the above" options used
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-82
@@ -1,82 +0,0 @@
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# GTBOP Moodle Review Prompts
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## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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### Dr. Ignazio Graziosi — January 15, 2026
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**Source:** Corrected SRT transcript (Stage 1) + Archive Package (Stage 2)
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**Prompts:** 6 timestamp-linked review tasks
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These short review tasks structure self-paced viewing by directing students to specific video segments and asking them to identify key points.
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---
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### Review Task 1
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**Watch:** 1:28 – 6:06
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**Task:** Identify the three components of the disease triangle and the three levels of the spiral of tree decline. For each spiral level, list one example factor that Dr. Graziosi names.
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**Key Points to Identify:**
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- Disease triangle: pest, host tree, environment
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- Predisposing factors (e.g., soil compaction, urban environment, genetic potential)
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- Inciting factors (e.g., defoliating insects, drought)
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- Contributing factors (e.g., wood-boring insects, nematodes, Armillaria)
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---
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### Review Task 2
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**Watch:** 8:23 – 10:47
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**Task:** Follow Dr. Graziosi's description of the emerald ash borer life cycle. List the diagnostic signs he describes for identifying an EAB-infested tree, and note the typical generation time.
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**Key Points to Identify:**
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- Larval galleries under bark disrupting phloem, cambium, and outer xylem
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- Water sprouts as a diagnostic feature
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- D-shaped exit holes from adult emergence
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- Primarily one generation per year, but a portion of the population takes two years
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---
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### Review Task 3
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**Watch:** 18:20 – 21:31
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**Task:** Dr. Graziosi presents the invasion curve diagram. Describe how pest prevalence changes over time and explain why early detection matters for control options and cost.
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**Key Points to Identify:**
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- Introduction → low prevalence → exponential growth → carrying capacity (plateau)
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- Early: eradication may be possible; prevention effective
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- Late: only local control (individual tree protection); costs increase dramatically
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- Land managers become aware before the general public
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---
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### Review Task 4
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**Watch:** 23:57 – 28:00
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**Task:** Describe the importation biological control program for EAB. Identify the three parasitoid wasp species' targets (what life stage each attacks) and explain why being specialists is an advantage.
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**Key Points to Identify:**
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- Two wasp species attack EAB larvae under bark (one uses vibrational cues and ovipositor to drill through bark)
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- One wasp species attacks EAB eggs
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- Specialists only attack EAB — won't waste their potential on other insects
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- Release technology: parasitized logs hung on trees; egg parasitoid released via small container ("O-binator")
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---
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### Review Task 5
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**Watch:** 29:42 – 38:30
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**Task:** Compare crapemyrtle bark scale to the emerald ash borer in terms of: (a) host specificity, (b) available biological control, and (c) effectiveness of trunk injection. Note specific differences Dr. Graziosi highlights.
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**Key Points to Identify:**
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- CMBS is a generalist (feeds on apple, soybean, fig, beautyberry, St. John's wort in addition to crapemyrtle); EAB is more host-specific (ash + white fringetree)
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- No effective specialist parasitoid found for CMBS in the US; EAB has imported specialist parasitoids
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- Trunk injection not viable for CMBS (crapemyrtle absorbs poorly); trunk injection is a viable option for EAB in ash
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---
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### Review Task 6
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**Watch:** 42:25 – 49:19
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**Task:** Explain Dr. Graziosi's two-part decision framework for determining whether to treat orange-striped oakworm. Then describe why clonal urban plantings are particularly vulnerable to this native pest.
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**Key Points to Identify:**
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- Part 1: Distinguish aesthetic vs. actual damage — threshold is ~25% defoliation
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- Part 2: Assess season — late-season defoliation less harmful (tree already stored nutrients)
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- Clonal nursery stock = low genetic variability = uniform susceptibility across all trees of the same clone
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- Urban heat island compounds the problem by accelerating insect development
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---
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## Verification Checklist
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- [x] All review tasks reference specific, verifiable video segments
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- [x] Key points match content actually presented in those segments
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- [x] No external knowledge needed to complete tasks
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- [x] Tasks progress through the full presentation (early → middle → late)
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@@ -1,7 +1,276 @@
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# Moodle Quiz — Graziosi, Tree Pests
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# GTBOP Moodle Quiz
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## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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### Dr. Ignazio Graziosi — January 15, 2026
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> **Placeholder** — Paste your Stage 4 pipeline output here.
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**Source:** Corrected SRT transcript (Stage 1) + Archive Package (Stage 2)
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**Questions:** 15
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**Difficulty Distribution:** 6 Recall (40%) | 6 Application (40%) | 3 Analysis (20%)
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**Coverage:** Disease triangle/decline spiral (Q1–Q3), EAB (Q4–Q8), CMBS (Q9–Q12), Orange-striped oakworm (Q13–Q15)
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---
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*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
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### Question 1
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**Timestamp Reference:** 1:28 – 2:32
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**Difficulty:** Recall
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According to Dr. Graziosi, the disease triangle describes the interaction of which three components that together cause tree damage?
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a) Pest, pathogen, and predator
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b) Pest, host tree, and environment
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c) Climate, soil, and genetics
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d) Insects, fungi, and nematodes
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**Correct Answer:** b
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**Explanation:** Dr. Graziosi introduced the disease triangle as the interaction of the pest, the tree (host), and the environment, emphasizing that the pest alone is not sufficient to cause damage.
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**Source in transcript:** ~2:04–2:32, blocks 33–35
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---
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### Question 2
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**Timestamp Reference:** 3:02 – 5:58
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**Difficulty:** Recall
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In the spiral of tree decline diagram, which of the following is classified as a predisposing factor?
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a) Defoliating insects
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b) Wood-boring insects
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c) Soil compaction
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d) Fungal pathogens
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**Correct Answer:** c
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**Explanation:** Dr. Graziosi identified soil compaction as a predisposing factor in the outermost spiral, calling it "often the number one issue for many trees." Defoliating insects are inciting factors, and wood-boring insects and fungi are contributing factors.
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||||
**Source in transcript:** ~4:08–4:31, blocks 49–52
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---
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### Question 3
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**Timestamp Reference:** 5:04 – 6:06
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**Difficulty:** Analysis
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|
||||
Dr. Graziosi explained that in the spiral of tree decline, each spiral level contains factors that can "cut through" directly to tree death. What is the practical significance of this for a tree care professional?
|
||||
|
||||
a) Only contributing factors can kill a tree
|
||||
b) A single stressor from any level can be severe enough to kill a tree on its own, without the other factors
|
||||
c) Trees can only die when all three levels of stressors are present simultaneously
|
||||
d) Predisposing factors must always precede inciting factors before decline begins
|
||||
|
||||
**Correct Answer:** b
|
||||
**Explanation:** Dr. Graziosi specifically demonstrated that individual factors from any spiral level — for example, urban environment alone or soil compaction alone — can cut through the different layers and bring the tree directly to death, without requiring all other stressor levels to be present.
|
||||
**Source in transcript:** ~5:32–5:54, blocks 64–66
|
||||
|
||||
---
|
||||
|
||||
### Question 4
|
||||
**Timestamp Reference:** 8:23 – 9:10
|
||||
**Difficulty:** Recall
|
||||
|
||||
Which of the following is a key diagnostic sign that a tree is being attacked by the emerald ash borer?
|
||||
|
||||
a) Sooty mold on branches
|
||||
b) Skeletonized leaves
|
||||
c) Water sprouts on the trunk
|
||||
d) Pink egg masses on bark
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi described water sprouts as "a very important diagnostic feature in order to understand if a tree is attacked by the emerald ash borer," noting they are the tree's desperate attempt to produce new growth in response to larval damage under the bark.
|
||||
**Source in transcript:** ~8:56–9:10, blocks 98–100
|
||||
|
||||
---
|
||||
|
||||
### Question 5
|
||||
**Timestamp Reference:** 10:04 – 10:47
|
||||
**Difficulty:** Recall
|
||||
|
||||
What is the characteristic shape of the exit hole left by an adult emerald ash borer emerging from a tree?
|
||||
|
||||
a) Circular
|
||||
b) Oval
|
||||
c) D-shaped
|
||||
d) T-shaped
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi described the "very characteristic, the famous D-shaped exit hole" left when the adult beetle emerges from the tree.
|
||||
**Source in transcript:** ~10:11–10:15, block 110
|
||||
|
||||
---
|
||||
|
||||
### Question 6
|
||||
**Timestamp Reference:** 10:48 – 11:42
|
||||
**Difficulty:** Application
|
||||
|
||||
A landscape manager in southern Georgia discovers EAB in local ash trees and plans a treatment schedule based on a single annual emergence. Based on Dr. Graziosi's presentation, what important consideration might this manager be overlooking?
|
||||
|
||||
a) EAB only emerges every two years in all locations
|
||||
b) A portion of the local EAB population may require two years to develop, meaning adults could emerge in both years
|
||||
c) EAB does not complete its life cycle in southern climates
|
||||
d) EAB only feeds on ash trees in northern states
|
||||
|
||||
**Correct Answer:** b
|
||||
**Explanation:** Dr. Graziosi explained that while EAB is mostly a one-generation-per-year insect, there is always a portion of the population that requires two years to develop. This is more pronounced at northern latitudes but occurs in any location, and it is important to know when planning control.
|
||||
**Source in transcript:** ~10:48–11:42, blocks 116–124
|
||||
|
||||
---
|
||||
|
||||
### Question 7
|
||||
**Timestamp Reference:** 13:02 – 13:46
|
||||
**Difficulty:** Recall
|
||||
|
||||
According to the presentation, what was the single most important factor responsible for the rapid spread of the emerald ash borer across North America?
|
||||
|
||||
a) Natural flight dispersal
|
||||
b) Nursery stock trade
|
||||
c) Movement of infested firewood
|
||||
d) Wind currents carrying adult beetles
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi identified firewood as the primary culprit, explaining that campers and travelers moved infested firewood, and researchers were able to connect the pattern of EAB spread closely with the highway and freeway system.
|
||||
**Source in transcript:** ~13:00–13:46, blocks 136–141
|
||||
|
||||
---
|
||||
|
||||
### Question 8
|
||||
**Timestamp Reference:** 15:26 – 16:44
|
||||
**Difficulty:** Application
|
||||
|
||||
An arborist inventorying trees in a Georgia neighborhood finds that all the ash trees have been killed by EAB but notices white fringetrees appear healthy. Based on Dr. Graziosi's presentation, should the arborist be concerned about EAB affecting the white fringetrees?
|
||||
|
||||
a) No, because white fringetrees are not in the same plant family as ash
|
||||
b) No, because EAB only attacks ash species
|
||||
c) Yes, because white fringetree was discovered to be an alternate host for EAB and could serve as a population reservoir
|
||||
d) Yes, but only if the white fringetrees are under drought stress
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi explained that in 2014 it was discovered that EAB could expand its host range to attack white fringetree (same family, Oleaceae). More importantly, white fringetree can function as a reservoir for EAB populations even after all ash trees in an area are gone.
|
||||
**Source in transcript:** ~15:26–16:44, blocks 162–172
|
||||
|
||||
---
|
||||
|
||||
### Question 9
|
||||
**Timestamp Reference:** 31:47 – 33:28
|
||||
**Difficulty:** Application
|
||||
|
||||
A pest control operator inspects a crapemyrtle in December and finds both mature adult females and small mobile nymphs on the bark. Based on the presentation, is this finding unusual?
|
||||
|
||||
a) Yes, all CMBS should be in a dormant stage during winter
|
||||
b) Yes, nymphs should only be present during summer months
|
||||
c) No, CMBS has overlapping generations, so multiple life stages can be present at any time of year
|
||||
d) No, but only adults should be present — the nymphs are likely a different insect
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi explained that CMBS can have up to five overlapping generations, meaning different stages of the insect can be found at any point. He showed a photo taken in Athens one month prior (winter) that contained both nymphs (crawlers) and adults.
|
||||
**Source in transcript:** ~33:10–33:47, blocks 327–329
|
||||
|
||||
---
|
||||
|
||||
### Question 10
|
||||
**Timestamp Reference:** 36:42 – 37:17
|
||||
**Difficulty:** Analysis
|
||||
|
||||
Dr. Graziosi discussed urban heat island effects in relation to crapemyrtle bark scale. Which of the following best explains why urban heat islands create a "double advantage" for scale insects?
|
||||
|
||||
a) Heat kills natural enemies while attracting more scales to the area
|
||||
b) Heat increases tree growth rate, providing more food for scales
|
||||
c) Heat stresses the host tree, increasing its susceptibility, while simultaneously accelerating the insect's development
|
||||
d) Heat causes scales to produce more sooty mold, which protects them from predators
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi described two specific effects of urban heat islands: first, it stresses trees, making them more susceptible to pests; second, it accelerates the development of the insect itself. He noted that scales are particularly good at taking advantage of urban heat.
|
||||
**Source in transcript:** ~36:57–37:21, blocks 363–368
|
||||
|
||||
---
|
||||
|
||||
### Question 11
|
||||
**Timestamp Reference:** 38:06 – 38:29
|
||||
**Difficulty:** Application
|
||||
|
||||
A landscape company wants to use trunk injection of systemic insecticides to control a crapemyrtle bark scale infestation. Based on the presentation, what should they know?
|
||||
|
||||
a) Trunk injection is the most effective method for CMBS control
|
||||
b) Trunk injection works but must be applied in fall
|
||||
c) Trunk injection is not a viable option because crapemyrtle absorbs systemic insecticides through the trunk very slowly
|
||||
d) Trunk injection is effective only on trees over 6 inches in diameter
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi specifically stated that chemical control of CMBS is complicated by the fact that crapemyrtle is not good at absorbing systemic insecticide through trunk injection, and that the chemical moves very slowly, making it not a viable option.
|
||||
**Source in transcript:** ~38:14–38:30, blocks 378–380
|
||||
|
||||
---
|
||||
|
||||
### Question 12
|
||||
**Timestamp Reference:** 38:31 – 41:44
|
||||
**Difficulty:** Recall
|
||||
|
||||
Which of the following is NOT one of the native predators Dr. Graziosi identified as feeding on crapemyrtle bark scale?
|
||||
|
||||
a) Twice-stabbed lady beetle
|
||||
b) Green lacewing
|
||||
c) Bigeminal lady beetle
|
||||
d) Parasitoid wasp specialist from Asia
|
||||
|
||||
**Correct Answer:** d
|
||||
**Explanation:** Dr. Graziosi identified three lady beetle species (twice-stabbed, bigeminal, and Harlequin) and green lacewings (particularly the red-lipped green lacewing) as predators of CMBS in North America. He specifically noted that no effective parasitoid had yet been found for CMBS in the US, unlike the situation in Asia.
|
||||
**Source in transcript:** ~38:48–41:00, blocks 385–409
|
||||
|
||||
---
|
||||
|
||||
### Question 13
|
||||
**Timestamp Reference:** 42:25 – 43:35
|
||||
**Difficulty:** Recall
|
||||
|
||||
According to the presentation, the orange-striped oakworm moth primarily feeds on which group of trees?
|
||||
|
||||
a) Ash species
|
||||
b) Crapemyrtles
|
||||
c) Red oaks, but also hickory, birch, and maple
|
||||
d) Pines and other conifers
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi described the orange-striped oakworm as a well-known pest of oaks, especially red oaks, but noted it can also feed on hickory, birch, and maple.
|
||||
**Source in transcript:** ~42:43–42:59, blocks 422–423
|
||||
|
||||
---
|
||||
|
||||
### Question 14
|
||||
**Timestamp Reference:** 44:51 – 46:10
|
||||
**Difficulty:** Analysis
|
||||
|
||||
Dr. Graziosi discussed Nuttall oaks on the UGA Athens campus as an example of vulnerability to the orange-striped oakworm. What underlying principle does this example illustrate about urban tree pest management?
|
||||
|
||||
a) Nuttall oaks are a non-native species poorly adapted to Georgia
|
||||
b) Monoculture plantings of clonal nursery stock create genetically uniform populations where susceptibility in one tree means susceptibility in all
|
||||
c) Nuttall oaks are particularly attractive to oakworm moths due to their leaf chemistry
|
||||
d) Older trees are always more resistant to defoliating insects than younger ones
|
||||
|
||||
**Correct Answer:** b
|
||||
**Explanation:** Dr. Graziosi explained that urban trees often come from nurseries as clonal trees with very low genetic variability — "they are basically the same tree." Therefore the susceptibility of one tree reflects the susceptibility of all trees of that clone on campus, making them uniformly vulnerable.
|
||||
**Source in transcript:** ~45:00–46:05, blocks 452–460
|
||||
|
||||
---
|
||||
|
||||
### Question 15
|
||||
**Timestamp Reference:** 47:56 – 49:05
|
||||
**Difficulty:** Application
|
||||
|
||||
A homeowner calls about an oak tree losing leaves in late September to orange-striped oakworm caterpillars. About 30% of the canopy has been defoliated. Based on Dr. Graziosi's decision framework, what is the most appropriate recommendation?
|
||||
|
||||
a) Immediately apply a broad-spectrum systemic insecticide via soil drench
|
||||
b) Apply Btk foliar spray urgently before the tree dies
|
||||
c) Consider that late-season defoliation is less harmful because the tree has already stored nutrients, and monitor rather than treat aggressively
|
||||
d) Remove and replace the tree, as 30% defoliation is always fatal
|
||||
|
||||
**Correct Answer:** c
|
||||
**Explanation:** Dr. Graziosi outlined two key considerations: the 25% defoliation threshold distinguishes aesthetic from actual damage, and late-season defoliation (even if substantial) is less harmful because the tree has already stored its nutrients. A mature oak at 30% defoliation in late September, while above the threshold, benefits from the seasonal timing, suggesting monitoring may be more appropriate than aggressive chemical intervention.
|
||||
**Source in transcript:** ~48:05–48:44, blocks 482–486
|
||||
|
||||
---
|
||||
|
||||
## Verification Checklist
|
||||
|
||||
- [x] All 15 questions derived exclusively from presentation content
|
||||
- [x] Timestamp references verified against corrected transcript
|
||||
- [x] No external knowledge required to answer correctly
|
||||
- [x] Difficulty distribution: 6 Recall / 6 Application / 3 Analysis
|
||||
- [x] Coverage spans early (disease triangle), middle (EAB, CMBS), and late (oakworm) content
|
||||
- [x] Answer keys unambiguous based on speaker's statements
|
||||
- [x] Distractors plausible but clearly incorrect per presentation
|
||||
- [x] No "all of the above" or "none of the above" options used
|
||||
|
||||
@@ -1,7 +1,82 @@
|
||||
# Review Prompts — Graziosi, Tree Pests
|
||||
# GTBOP Moodle Review Prompts
|
||||
## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
### Dr. Ignazio Graziosi — January 15, 2026
|
||||
|
||||
> **Placeholder** — Paste your Stage 4 pipeline output here.
|
||||
**Source:** Corrected SRT transcript (Stage 1) + Archive Package (Stage 2)
|
||||
**Prompts:** 6 timestamp-linked review tasks
|
||||
|
||||
These short review tasks structure self-paced viewing by directing students to specific video segments and asking them to identify key points.
|
||||
|
||||
---
|
||||
|
||||
*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
### Review Task 1
|
||||
**Watch:** 1:28 – 6:06
|
||||
**Task:** Identify the three components of the disease triangle and the three levels of the spiral of tree decline. For each spiral level, list one example factor that Dr. Graziosi names.
|
||||
**Key Points to Identify:**
|
||||
- Disease triangle: pest, host tree, environment
|
||||
- Predisposing factors (e.g., soil compaction, urban environment, genetic potential)
|
||||
- Inciting factors (e.g., defoliating insects, drought)
|
||||
- Contributing factors (e.g., wood-boring insects, nematodes, Armillaria)
|
||||
|
||||
---
|
||||
|
||||
### Review Task 2
|
||||
**Watch:** 8:23 – 10:47
|
||||
**Task:** Follow Dr. Graziosi's description of the emerald ash borer life cycle. List the diagnostic signs he describes for identifying an EAB-infested tree, and note the typical generation time.
|
||||
**Key Points to Identify:**
|
||||
- Larval galleries under bark disrupting phloem, cambium, and outer xylem
|
||||
- Water sprouts as a diagnostic feature
|
||||
- D-shaped exit holes from adult emergence
|
||||
- Primarily one generation per year, but a portion of the population takes two years
|
||||
|
||||
---
|
||||
|
||||
### Review Task 3
|
||||
**Watch:** 18:20 – 21:31
|
||||
**Task:** Dr. Graziosi presents the invasion curve diagram. Describe how pest prevalence changes over time and explain why early detection matters for control options and cost.
|
||||
**Key Points to Identify:**
|
||||
- Introduction → low prevalence → exponential growth → carrying capacity (plateau)
|
||||
- Early: eradication may be possible; prevention effective
|
||||
- Late: only local control (individual tree protection); costs increase dramatically
|
||||
- Land managers become aware before the general public
|
||||
|
||||
---
|
||||
|
||||
### Review Task 4
|
||||
**Watch:** 23:57 – 28:00
|
||||
**Task:** Describe the importation biological control program for EAB. Identify the three parasitoid wasp species' targets (what life stage each attacks) and explain why being specialists is an advantage.
|
||||
**Key Points to Identify:**
|
||||
- Two wasp species attack EAB larvae under bark (one uses vibrational cues and ovipositor to drill through bark)
|
||||
- One wasp species attacks EAB eggs
|
||||
- Specialists only attack EAB — won't waste their potential on other insects
|
||||
- Release technology: parasitized logs hung on trees; egg parasitoid released via small container ("O-binator")
|
||||
|
||||
---
|
||||
|
||||
### Review Task 5
|
||||
**Watch:** 29:42 – 38:30
|
||||
**Task:** Compare crapemyrtle bark scale to the emerald ash borer in terms of: (a) host specificity, (b) available biological control, and (c) effectiveness of trunk injection. Note specific differences Dr. Graziosi highlights.
|
||||
**Key Points to Identify:**
|
||||
- CMBS is a generalist (feeds on apple, soybean, fig, beautyberry, St. John's wort in addition to crapemyrtle); EAB is more host-specific (ash + white fringetree)
|
||||
- No effective specialist parasitoid found for CMBS in the US; EAB has imported specialist parasitoids
|
||||
- Trunk injection not viable for CMBS (crapemyrtle absorbs poorly); trunk injection is a viable option for EAB in ash
|
||||
|
||||
---
|
||||
|
||||
### Review Task 6
|
||||
**Watch:** 42:25 – 49:19
|
||||
**Task:** Explain Dr. Graziosi's two-part decision framework for determining whether to treat orange-striped oakworm. Then describe why clonal urban plantings are particularly vulnerable to this native pest.
|
||||
**Key Points to Identify:**
|
||||
- Part 1: Distinguish aesthetic vs. actual damage — threshold is ~25% defoliation
|
||||
- Part 2: Assess season — late-season defoliation less harmful (tree already stored nutrients)
|
||||
- Clonal nursery stock = low genetic variability = uniform susceptibility across all trees of the same clone
|
||||
- Urban heat island compounds the problem by accelerating insect development
|
||||
|
||||
---
|
||||
|
||||
## Verification Checklist
|
||||
|
||||
- [x] All review tasks reference specific, verifiable video segments
|
||||
- [x] Key points match content actually presented in those segments
|
||||
- [x] No external knowledge needed to complete tasks
|
||||
- [x] Tasks progress through the full presentation (early → middle → late)
|
||||
|
||||
@@ -1,6 +1,107 @@
|
||||
# Archive Summary — Graziosi, Tree Pests
|
||||
# GTBOP Webinar Archive Summary
|
||||
## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
> **Placeholder** — Paste your Stage 2 pipeline output here.
|
||||
**Webinar Date:** January 15, 2026
|
||||
**Speaker:** Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
**Moderator:** Dr. Bodie Pennisi, UGA Horticulturist
|
||||
**Duration:** 52:11
|
||||
**Series:** Green & Commercial
|
||||
**CEU Categories:** TBD
|
||||
|
||||
---
|
||||
|
||||
## NARRATIVE SUMMARY
|
||||
|
||||
Dr. Ignazio Graziosi, an assistant professor in the Warnell School of Forestry and Natural Resources at the University of Georgia, presented a framework for understanding tree pest damage through ecological interactions. He emphasized that damage results from the interplay of three components — the pest, the host tree, and the environment — known as the disease triangle. He extended this concept through the spiral of tree decline, illustrating how predisposing factors like soil compaction, inciting factors like drought, and contributing factors including wood-boring insects and fungi push trees toward death, particularly in urban environments.
|
||||
|
||||
Dr. Graziosi applied this framework to three case studies. The first examined the emerald ash borer (EAB), a non-native pest devastating native ash across North America. He reviewed the EAB life cycle, the role of firewood movement in spreading the invasion, and the diversity of ash species at risk in Georgia, including the white fringetree (family Oleaceae) as an alternate host and population reservoir. He explained how EAB populations remain low in Asia due to co-evolved resistant trees and specialist parasitoid wasps, which USDA has introduced to North America through importation biological control. Chemical protection via tree injection, bark spray, and soil drench remains critical for high-value landscape trees.
|
||||
|
||||
The second case study addressed crapemyrtle bark scale (CMBS), a non-native pest attacking crapemyrtle (*Lagerstroemia indica*) across the South. Dr. Graziosi described overlapping generations that complicate control timing, an expanding host range including American beautyberry and St. John's wort, and urban heat island effects that stress trees while accelerating insect development. Chemical options include soil drench, soil injection, and foliar sprays, though trunk injection is ineffective in crapemyrtle. Native predators such as lady beetles and green lacewings provide some control but lack the specialization needed for sustained suppression.
|
||||
|
||||
The third case study examined the orange-striped oakworm moth, a native pest of native oaks. Dr. Graziosi explained why clonal nursery stock in urban landscapes creates genetically uniform stands with low resistance, compounded by urban heat effects. He outlined a practical decision framework: managers should distinguish aesthetic damage from actual harm using a 25% defoliation threshold and recognize that late-season defoliation is less damaging. Btk (*Bacillus thuringiensis* kurstaki) as a foliar spray is effective against young larvae with minimal impact on natural enemies.
|
||||
|
||||
---
|
||||
|
||||
## YOUTUBE TIMESTAMPS
|
||||
|
||||
0:00 Introduction and speaker credentials
|
||||
1:28 The disease triangle: pest, tree, and environment
|
||||
3:02 The spiral of tree decline
|
||||
6:07 Native vs. non-native pest and tree interactions
|
||||
7:22 Example 1: Emerald ash borer (EAB) — overview
|
||||
8:23 EAB life cycle and damage symptoms
|
||||
10:48 EAB generation time and temperature effects
|
||||
11:57 EAB spread across North America and firewood
|
||||
13:47 EAB in Georgia and native ash species diversity
|
||||
15:26 White fringetree as alternate EAB host
|
||||
16:43 Global trade and non-native species introductions
|
||||
18:20 The invasion curve: detection, eradication, and control
|
||||
21:32 Why EAB is not a pest in Asia
|
||||
22:34 Chemical control methods for EAB
|
||||
23:57 Importation biological control: parasitoid wasps
|
||||
28:01 Native natural enemies and the goal of balance
|
||||
29:42 Example 2: Crapemyrtle bark scale (CMBS) — overview
|
||||
31:47 CMBS biology, life cycle, and overlapping generations
|
||||
33:47 CMBS invasion timeline and early detection
|
||||
35:02 CMBS and the invasion curve in Georgia
|
||||
36:06 CMBS host range expansion in North America
|
||||
36:42 Urban heat island effects on scales
|
||||
37:28 Chemical control options for CMBS
|
||||
38:31 Natural enemies: lady beetles and lacewings
|
||||
42:04 Balancing chemical and biological control for CMBS
|
||||
42:25 Example 3: Orange-striped oakworm moth — overview
|
||||
43:53 Oakworm life cycle and seasonal timing
|
||||
44:51 Why urban and clonal trees are vulnerable
|
||||
46:35 Natural enemies of the oakworm
|
||||
47:56 Control decisions: damage thresholds and Btk
|
||||
49:19 Presentation wrap-up and key takeaways
|
||||
50:01 Moderator comments on CMBS expansion in Georgia
|
||||
|
||||
---
|
||||
|
||||
## QUESTIONS & ANSWERS
|
||||
|
||||
**Q: What is the disease triangle, and why is it important for understanding tree pest damage?**
|
||||
A: The disease triangle describes how damage to a tree results from the interaction of three components: the pest, the host tree, and the environment. Damage is not caused by the pest alone — a susceptible tree in a stressful environment amplifies the impact. Dr. Graziosi emphasized that this framework helps professionals identify which factors they can influence when managing pest problems, particularly in urban settings where environmental stress is high.
|
||||
|
||||
**Q: What is the spiral of tree decline, and how does it relate to tree death in urban environments?**
|
||||
A: The spiral of tree decline is a diagram with three levels of stressors — predisposing factors (such as soil compaction and genetic potential), inciting factors (such as defoliating insects and drought), and contributing factors (such as wood-boring insects, nematodes, and Armillaria). Each level can independently bring a tree to death, and urban environments intensify these stressors. The key takeaway is that tree death typically results from multiple interacting factors rather than a single cause.
|
||||
|
||||
**Q: How does firewood movement contribute to the spread of the emerald ash borer?**
|
||||
A: The movement of infested firewood by campers and travelers was the primary pathway for EAB's rapid spread across North America. Researchers were able to connect the pattern of EAB spread closely with the highway and freeway system. This led to the "Don't Move Firewood" campaign, which also helps contain other invasive insects such as the Asian longhorned beetle.
|
||||
|
||||
**Q: Why is the emerald ash borer not considered a pest in its native range in Asia?**
|
||||
A: Two main reasons explain this. First, native Asian ash species co-evolved with the EAB and are resistant or less susceptible — only very weak, stressed trees are attacked there. Second, a community of specialist natural enemies, including parasitoid wasps, keeps EAB populations low in Asia. This understanding directly informed both the chemical protection approach (making North American trees artificially resistant) and the importation biological control program.
|
||||
|
||||
**Q: What are the chemical control options for protecting ash trees from the emerald ash borer?**
|
||||
A: Three main application methods are available: tree injection, bark spray, and soil drench. Some products can be applied by homeowners while others require a professional applicator. Timing is important — for example, soil drench needs to be applied in spring before leaves emerge. Dr. Graziosi noted that chemical protection remains critical for saving individual high-value trees, since biological control has not yet been fully successful for EAB in North America.
|
||||
|
||||
**Q: Why is trunk injection not effective for controlling crapemyrtle bark scale?**
|
||||
A: Crapemyrtle does not absorb systemic insecticides well through trunk injection — the chemical moves very slowly through the plant, making it an ineffective delivery method. Instead, soil drench, soil injection, and foliar sprays are the recommended chemical control approaches for CMBS. Soaps can also be used to target crawlers, the young mobile nymphs.
|
||||
|
||||
**Q: What native predators help control crapemyrtle bark scale, and what are their limitations?**
|
||||
A: Three lady beetle species — the twice-stabbed lady beetle, the bigeminal lady beetle, and the non-native Harlequin lady beetle — are active predators of CMBS, feeding on both nymphs and adults. Green lacewings, particularly the red-lipped green lacewing, also prey on CMBS nymphs and eggs and are commercially available. However, these predators are generalists that often arrive late in the season and do not build sustained populations on infested trees, limiting their effectiveness as standalone control agents.
|
||||
|
||||
**Q: How should a landscape professional decide whether to treat for orange-striped oakworm?**
|
||||
A: Dr. Graziosi outlined a two-part decision framework. First, distinguish between aesthetic damage and actual harm to the tree — the threshold is approximately 25% defoliation. Second, assess the season: late-season defoliation, even if substantial, is less harmful because the tree has already stored its nutrients. Treatment is most warranted for young or small trees experiencing significant early-season defoliation.
|
||||
|
||||
**Q: Why are urban landscape trees particularly vulnerable to the orange-striped oakworm?**
|
||||
A: Urban landscape trees are often clonal nursery stock with very low genetic variability. Dr. Graziosi used the example of Nuttall oaks on the UGA Athens campus — beautiful, high-quality trees that are essentially genetically identical, meaning the susceptibility of one tree is the susceptibility of all. Combined with urban heat island effects that accelerate insect development, this creates conditions favoring pest outbreaks.
|
||||
|
||||
**Q: What is importation biological control, and how has it been applied to the emerald ash borer?**
|
||||
A: Importation biological control involves studying the natural enemies that effectively control a pest in its native range and introducing them to the invaded region. USDA conducted risk assessments and introduced three specialist parasitoid wasp species from Asia to target EAB. Two species attack EAB larvae under the bark using ovipositors to locate them through vibrational cues, while the third parasitizes EAB eggs. These wasps are specialists that only attack EAB, ensuring they won't harm other insects.
|
||||
|
||||
**Q: What is the significance of the white fringetree for emerald ash borer management in Georgia?**
|
||||
A: The white fringetree, which belongs to the same family (Oleaceae) as ash, was discovered in 2014 to be an alternate host for the EAB. This is significant not only because it means another native plant species is at risk, but more importantly because white fringetree can serve as a population reservoir, allowing EAB to persist in an area even after all ash trees are gone. This has direct implications for long-term management strategies in Georgia.
|
||||
|
||||
---
|
||||
|
||||
## ADDITIONAL RESOURCES
|
||||
|
||||
- Dr. Graziosi referenced QR codes linking to UGA publications on EAB status and control in Georgia, the full insecticide protocol for EAB, and CMBS biology and management.
|
||||
- The iTree tool suite (mentioned for calculating ecosystem services and benefits of trees, and for right-tree-right-place selection) is available at itreetools.org.
|
||||
- Sign-in sheets for CEU credit should be submitted to gtbop@uga.edu or mailed to the address on the sign-in sheet.
|
||||
- The next GTBOP webinar was announced for March 2026.
|
||||
|
||||
---
|
||||
|
||||
|
||||
@@ -1,7 +1,183 @@
|
||||
# Transcript Corrections — Graziosi, Tree Pests
|
||||
# SRT Transcript Correction Summary
|
||||
## File: Tree Pests in the Landscape — Dr. Ignazio Graziosi
|
||||
|
||||
> **Placeholder** — Paste your Stage 1 pipeline output here.
|
||||
**Date Corrected:** February 8, 2026
|
||||
**Webinar Date:** January 15, 2026
|
||||
**Series:** Green & Commercial
|
||||
**Topic:** Entomology / Tree Health / Urban Forestry
|
||||
**Speaker:** Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
**Moderator:** Dr. Bodie Pennisi, UGA Horticulturist
|
||||
**Closing:** Rich Braman
|
||||
|
||||
---
|
||||
|
||||
*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
## SOURCE VERIFICATION
|
||||
- **Original blocks:** 529
|
||||
- **Corrected blocks:** 529 ✓ MATCH CONFIRMED
|
||||
- **Time range:** 00:00:01,100 to 00:52:11,580
|
||||
- **Runtime:** ~52 minutes
|
||||
- **File reading:** COMPLETE ✓
|
||||
- **Coverage proof:**
|
||||
- Early [~2:28]: Disease triangle concept — pest, tree, and environment interaction causes damage
|
||||
- Middle [~24:03]: Importation biological control for EAB — parasitoid wasps brought from Asia to North America
|
||||
- Late [~48:46]: Btk (Bacillus thuringiensis kurstaki) as foliar spray for orange-striped oakworm control; 25% defoliation threshold
|
||||
|
||||
---
|
||||
|
||||
## Corrections Applied
|
||||
|
||||
### Proper Nouns — Speaker Names
|
||||
- "Ignacio" → "Ignazio" (Blocks 2, 503)
|
||||
- "Bori" → "Bodie" (Blocks 15, 62)
|
||||
- "body" → "Bodie" (Block 502)
|
||||
- "Bodhi" → "Bodie" (Block 526)
|
||||
- "buddy" → "Bodie" (Block 519 — Graziosi farewell to Pennisi)
|
||||
|
||||
### Emerald Ash Borer — Name Corrections (extensive)
|
||||
|
||||
Whisper produced dozens of garbled variants of "emerald ash borer" and its abbreviation "EAB" throughout the transcript. All were corrected to the standard forms:
|
||||
|
||||
**Full name variants corrected → "emerald ash borer":**
|
||||
- "emeralish borer" (Blocks 84, 85)
|
||||
- "emeralash borer" (Blocks 87, 88)
|
||||
- "gemaralash borer" (Block 100)
|
||||
- "Emmerlash border" (Blocks 123, 124)
|
||||
- "emeralosh borer" (Block 91)
|
||||
- "Yemalash Bor" (Block 146)
|
||||
- "Ammonash war" (Block 150)
|
||||
- "MLA-Scheish border" (Block 163)
|
||||
- "Amaralash border" (Block 220)
|
||||
|
||||
**Abbreviation variants corrected → "EAB":**
|
||||
- "EAD" (Block 91)
|
||||
- "IAB" (Blocks 278, 280, 281)
|
||||
- "AAB" (Blocks 170, 171, 172, 173)
|
||||
- "EEA-B" (Block 229)
|
||||
- "AB" (Block 297)
|
||||
- "AEB" (Blocks 185, 186)
|
||||
- "yebby" / "yebe" / "yee-be" / "yeb" / "yebis" (Blocks 188, 193, 243, 254, 257, 263, 265, 266, 269, 270)
|
||||
- "the baby" (Block 243 — context: "the EAB there")
|
||||
- "the bee" (Block 264 — context: parasitoid drilling into bark)
|
||||
- "YB" (Block 170)
|
||||
|
||||
**Total EAB-related corrections: ~45+ individual instances**
|
||||
|
||||
### Crapemyrtle Bark Scale — Name Corrections
|
||||
|
||||
All variants standardized to "crapemyrtle bark scale" (one word, no hyphen per extension convention):
|
||||
- "crepe-mirtle bark scale" → "crapemyrtle bark scale" (multiple blocks)
|
||||
- "crepe-myrtle bark scale" → "crapemyrtle bark scale"
|
||||
- "crepe myrtle bark scale" → "crapemyrtle bark scale"
|
||||
- "crepe-mirtle bar scale" → "crapemyrtle bark scale"
|
||||
- "crepe myrtle bar scale" → "crapemyrtle bark scale"
|
||||
- "crab myrtle basket" → "crapemyrtle bark scale" (Block 337)
|
||||
- "capemir" → "crapemyrtle" (Block 404)
|
||||
- "bar scale" → "bark scale" (Blocks 334, 405)
|
||||
- All standalone "crepe myrtle" / "crepe-myrtle" / "crepe-mirtle" → "crapemyrtle"
|
||||
|
||||
### Scientific Names
|
||||
- "Lagerstrenia indica" → "*Lagerstroemia indica*" (Block 304)
|
||||
- "La Grestorhemia speciosa" → "*Lagerstroemia speciosa*" (Block 353)
|
||||
- "armillaria" → "Armillaria" (Block 57 — genus capitalized)
|
||||
- "oleese" → "Oleaceae" (Block 165)
|
||||
|
||||
### Technical Terms — Entomology
|
||||
- "four-inch star" → "fourth instar" (Block 102)
|
||||
- "pre-culture" → "prepupa" (Block 107)
|
||||
- "ovopositor" → "ovipositor" (Block 264, 2 instances)
|
||||
- "T's tail … T's ovipositor" → "Its tail … its ovipositor" (Block 264)
|
||||
- "BDK, Bacillus thuringiensis, Crustacea" → "Btk, Bacillus thuringiensis kurstaki" (Blocks 488–489)
|
||||
- "inseticides" → "insecticides" (Block 231)
|
||||
- "twice-tapped" → "twice-stabbed" (Block 392)
|
||||
- "ladybeadle" → "lady beetle" (Blocks 393, 394, multiple instances)
|
||||
- "Geminal" / "begeminal" → "bigeminal" (Blocks 392, 393)
|
||||
- "infuriate the biological control" → "interfere with the biological control" (Block 415)
|
||||
- "incident" → "insect" (Block 327 — "stages of the insect")
|
||||
|
||||
### Technical Terms — Tree Biology
|
||||
- "the camium, the artoxylem" → "the cambium, the outer xylem" (Block 92)
|
||||
- "are incapacity" → "carrying capacity" (Block 207)
|
||||
- "interesting trace" → "interesting tree" (Block 155 — about blue ash)
|
||||
|
||||
### Species Names
|
||||
- "orange-type wormoth" → "orange-striped oakworm moth" (Blocks 461, 464)
|
||||
- "orange-type oak wormoth" → "orange-striped oakworm moth" (Block 421 was correct; Block 461 corrected)
|
||||
- "orange stripe, / awkward mouth" → "orange-striped / oakworm moth" (Blocks 474–475)
|
||||
- "natal oaks" → "Nuttall oaks" (Block 456)
|
||||
- "Nuttal oak" → "Nuttall oak" (Block 460)
|
||||
- "white fring tree" → "white fringetree" (Blocks 165, 357)
|
||||
- "white fringe tree" → "white fringetree" (Blocks 168, 169, 172)
|
||||
- "four webworm" → "fall webworm" (Block 29)
|
||||
|
||||
### Pest Names / Other
|
||||
- "also can't send John's work" → "also on St. John's wort" (Block 358)
|
||||
- "in the festive fire" → "infested firewood" (Block 137)
|
||||
- "non-80 species" → "non-native species" (Block 181)
|
||||
- "expansion of the past" → "expansion of the pest" (Block 506)
|
||||
- "contain the incident to quarantine" → "contain the insect through quarantine" (Block 130)
|
||||
|
||||
### Grammar / Transcription Cleanup
|
||||
- "invasive invasive species" → "invasive species" (Block 5 — Whisper doubled word)
|
||||
- "those past" → "those pests" (Block 76)
|
||||
- "different tests" → "different pests" (Block 77)
|
||||
- "This is the map, is the trap" → "This is the trap" (Block 186)
|
||||
|
||||
---
|
||||
|
||||
## Flagged for Verification
|
||||
|
||||
- **Block 45:** [VERIFY: "Dr. Klein"] — Speaker references "Dr. Klein" as the previous presenter on the webinar. Confirm name against webinar program for January 15, 2026.
|
||||
|
||||
- **Block 161:** [VERIFY: "swamp white and small ash"] — Speaker lists Georgia ash species. "Swamp white ash" is not a standard species name. "Small ash" may refer to *Fraxinus smallii* (Small's ash). Verify species list against audio.
|
||||
|
||||
- **Block 176:** [VERIFY: "this not accidental introduction"] — Meaning is likely "this accidental introduction" (EAB was accidentally introduced via trade). Whisper may have misplaced "not" from later in the sentence. Verify against audio.
|
||||
|
||||
- **Block 277:** [VERIFY: "the O-binator"] — Name of egg parasitoid release device. Possibly "Oobinator" (a play on *Oobius agrili*, the egg parasitoid). Verify device name against audio and USDA-ARS biocontrol literature.
|
||||
|
||||
- **Block 392–393:** [VERIFY: "bigeminal lady beetle"] — Corrected from "begeminal" / "Geminal ladybeadle." Likely refers to *Hyperaspis bigeminata*, a documented predator of crapemyrtle bark scale. Confirm species name against audio.
|
||||
|
||||
- **Block 473–474:** [VERIFY: "pinnacle leaf"] — Speaker describes underside of a leaf with oakworm eggs. "Pinnacle" is not a standard botanical term. Possibly "pin oak leaf" spoken with Italian accent. Verify against audio.
|
||||
|
||||
- **Block 511:** [VERIFY: "the planet"] — Bodie Pennisi says "all across the areas around the planet." Context suggests she may have said "the plantings" (discussing CMBS in Savannah plantings). Verify against audio.
|
||||
|
||||
- **Block 528:** [VERIFY: "buddy"] — Rich Braman says "I'll see you soon, buddy." Could be the word "buddy" or a misheard "Bodie." Left as-is pending audio verification.
|
||||
|
||||
- **Blocks 13–14:** [VERIFY: "education and analysis. / outreach."] — These blocks have overlapping timestamps (13 ends at 01:01.380, 14 starts at 01:00.920). Block 13's "analysis" may actually be "outreach" (matching block 14). Verify against audio.
|
||||
|
||||
---
|
||||
|
||||
## SRT Format Compliance
|
||||
✅ All timestamps preserved exactly as original
|
||||
✅ All sequence numbers maintained (1–529)
|
||||
✅ Blank lines between segments preserved
|
||||
✅ Maximum 2 lines per subtitle segment maintained
|
||||
✅ No segments merged or split
|
||||
✅ Block count: 529 original = 529 corrected ✓
|
||||
|
||||
---
|
||||
|
||||
## New Patterns for Common Corrections Reference
|
||||
|
||||
The following Whisper error patterns are new to this webinar and should be added to the project reference:
|
||||
|
||||
| Whisper Output | Correct Form | Context |
|
||||
|----------------|-------------|---------|
|
||||
| emeralish/emeralash/gemaralash/Emmerlash/emeralosh borer | emerald ash borer | Multiple phonetic approximations |
|
||||
| yebby / yebe / yee-be / yeb | EAB | Whisper interpreting the abbreviation spoken with accent |
|
||||
| IAB / AAB / EAD / EEA-B / AEB / AB | EAB | Abbreviation variants |
|
||||
| four-inch star | fourth instar | Entomology life stage |
|
||||
| ovopositor | ovipositor | Entomology anatomy |
|
||||
| pre-culture | prepupa | Entomology life stage |
|
||||
| ladybeadle | lady beetle | Common name |
|
||||
| twice-tapped | twice-stabbed | Lady beetle common name |
|
||||
| BDK / Crustacea | Btk / kurstaki | *Bacillus thuringiensis* subspecies |
|
||||
| La Grestorhemia / Lagerstrenia | Lagerstroemia | Crapemyrtle genus |
|
||||
| natal oaks | Nuttall oaks | Oak species |
|
||||
| crab myrtle basket | crapemyrtle bark scale | Pest common name |
|
||||
| in the festive fire | infested firewood | EAB spread pathway |
|
||||
| can't send John's work | St. John's wort | CMBS alternate host |
|
||||
|
||||
---
|
||||
|
||||
**Total Corrections:** ~120+ individual corrections across 529 subtitle blocks
|
||||
**Processing:** Complete file (529 subtitle blocks, 2116 lines)
|
||||
|
||||
@@ -1,7 +1,70 @@
|
||||
# Extension Agent Version — Graziosi, Tree Pests
|
||||
|
||||
> **Placeholder** — Paste your Stage 3 pipeline output here.
|
||||
# GTBOP Webinar — Extension Agent Resource
|
||||
## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
---
|
||||
|
||||
*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
### Webinar Details
|
||||
|
||||
| Field | Details |
|
||||
|-------|---------|
|
||||
| **Date** | January 15, 2026 |
|
||||
| **Speaker** | Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia |
|
||||
| **Moderator** | Dr. Bodie Pennisi, UGA Horticulturist |
|
||||
| **Duration** | 52 minutes, 11 seconds |
|
||||
| **Series** | Green & Commercial |
|
||||
| **CEU Categories** | TBD |
|
||||
|
||||
---
|
||||
|
||||
### CEU Information
|
||||
|
||||
**Applicable License Categories (pending confirmation):**
|
||||
- Category 24 — Ornamental and Turf Pest Control (likely primary)
|
||||
- Category 27 — Right-of-Way Pest Control (possible secondary)
|
||||
|
||||
**Credit Hours:** TBD
|
||||
|
||||
**Viewing Instructions for Asynchronous CEU Delivery:**
|
||||
This archived webinar may be used for self-paced continuing education. Viewers should watch the full presentation (approximately 52 minutes), complete any required assessment activities, and submit documentation per county or program requirements. Sign-in sheets should be submitted to gtbop@uga.edu or mailed to the address printed at the top of the sign-in sheet.
|
||||
|
||||
---
|
||||
|
||||
### Content Summary
|
||||
|
||||
Dr. Ignazio Graziosi presents a framework for understanding tree pest damage using the disease triangle (pest, host tree, environment) and spiral of tree decline. The presentation is organized around three case studies that cover the major pest-host interaction scenarios landscape professionals encounter:
|
||||
|
||||
**Case Study 1 — Emerald Ash Borer (EAB): Non-native pest on native trees**
|
||||
Covers EAB life cycle and damage identification (water sprouts, D-shaped exit holes, canopy dieback), the role of firewood in spreading the invasion, Georgia's ash species diversity and the white fringetree as an alternate host, the invasion curve concept, importation biological control using specialist parasitoid wasps from Asia, and chemical protection methods (tree injection, bark spray, soil drench). Relevant for agents advising on ash tree conservation and urban forest management.
|
||||
|
||||
**Case Study 2 — Crapemyrtle Bark Scale (CMBS): Non-native pest on non-native trees**
|
||||
Covers CMBS identification (white females, pink eggs, sooty mold), overlapping generations, host range expansion to American beautyberry and St. John's wort, urban heat island effects, chemical control options (soil drench, soil injection, foliar spray — note trunk injection is not effective for crapemyrtle), and the role of lady beetles and green lacewings as predators. Particularly relevant for Georgia agents, as the invasion is still at an early stage in much of the state.
|
||||
|
||||
**Case Study 3 — Orange-Striped Oakworm Moth: Native pest on native trees**
|
||||
Covers life cycle and seasonal timing (late summer/fall, two generations in the South), vulnerability of clonal urban tree plantings with low genetic diversity, natural enemies, and a practical decision framework: 25% defoliation threshold for treatment, and the reduced harm of late-season defoliation. Btk (*Bacillus thuringiensis* kurstaki) as a selective foliar spray is the recommended first option.
|
||||
|
||||
---
|
||||
|
||||
### Key Concepts for Agent Programs
|
||||
|
||||
These concepts from the presentation are well-suited for county programming and client consultations:
|
||||
|
||||
**Disease Triangle** — Damage is an interaction of pest, host, and environment. Helps clients understand why the same pest causes different levels of damage in different settings.
|
||||
|
||||
**Spiral of Tree Decline** — Multiple stressor categories (predisposing, inciting, contributing) interact. Soil compaction alone can bring a tree to death. Useful for educating clients on urban tree care beyond pest control.
|
||||
|
||||
**Invasion Curve** — Early detection enables more effective and less costly control. Relevant for CMBS messaging in counties where the pest has not yet established at high levels.
|
||||
|
||||
**Urban Heat Island Effects** — Stresses trees while accelerating insect development. Relevant for any agent working in urban/suburban landscapes.
|
||||
|
||||
**Aesthetic vs. Actual Damage** — The 25% defoliation threshold and seasonal timing consideration help agents advise clients on when treatment is and isn't warranted.
|
||||
|
||||
---
|
||||
|
||||
### Suggested Pairings
|
||||
|
||||
This webinar complements other GTBOP content covering urban tree care, scale insect management, and integrated pest management principles. It pairs well with presentations on ornamental pest identification, systemic insecticide application, and biological control in landscape settings.
|
||||
|
||||
---
|
||||
|
||||
*Getting the Best of Pests (GTBOP) | UGA Center for Urban Agriculture*
|
||||
*For questions about CEU delivery or archived webinar use, contact gtbop@uga.edu*
|
||||
|
||||
@@ -1,7 +1,105 @@
|
||||
# Website Version — Graziosi, Tree Pests
|
||||
# GTBOP Webinar Archive
|
||||
## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
> **Placeholder** — Paste your Stage 3 pipeline output here.
|
||||
**Webinar Date:** January 15, 2026
|
||||
**Speaker:** Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
**Moderator:** Dr. Bodie Pennisi, UGA Horticulturist
|
||||
**Duration:** 52:11
|
||||
**Series:** Green & Commercial
|
||||
**CEU Categories:** TBD
|
||||
|
||||
---
|
||||
|
||||
### Summary
|
||||
|
||||
Dr. Ignazio Graziosi, an assistant professor in the Warnell School of Forestry and Natural Resources at the University of Georgia, presents a framework for understanding tree pest damage through ecological interactions. Using the disease triangle and spiral of tree decline, he examines how the pest, host tree, and environment interact to produce damage — particularly in stressful urban settings.
|
||||
|
||||
Three case studies illustrate different ecological scenarios. The emerald ash borer (EAB), a non-native pest devastating native ash, demonstrates the value of importation biological control using specialist parasitoid wasps from Asia, the invasion curve concept, and the continued importance of chemical protection for high-value trees. Crapemyrtle bark scale (CMBS), a non-native pest on non-native crapemyrtle (*Lagerstroemia indica*), highlights challenges including overlapping generations, expanding host range to American beautyberry and St. John's wort, urban heat island effects, and the limitations of generalist native predators. The orange-striped oakworm moth, a native pest of native oaks, illustrates how low genetic diversity in clonal urban plantings and environmental stress create vulnerability, with practical guidance on the 25% defoliation threshold and Btk (*Bacillus thuringiensis* kurstaki) as a selective foliar treatment.
|
||||
|
||||
---
|
||||
|
||||
### Video Chapters
|
||||
|
||||
0:00 Introduction and speaker credentials
|
||||
1:28 The disease triangle: pest, tree, and environment
|
||||
3:02 The spiral of tree decline
|
||||
6:07 Native vs. non-native pest and tree interactions
|
||||
7:22 Example 1: Emerald ash borer (EAB) — overview
|
||||
8:23 EAB life cycle and damage symptoms
|
||||
10:48 EAB generation time and temperature effects
|
||||
11:57 EAB spread across North America and firewood
|
||||
13:47 EAB in Georgia and native ash species diversity
|
||||
15:26 White fringetree as alternate EAB host
|
||||
16:43 Global trade and non-native species introductions
|
||||
18:20 The invasion curve: detection, eradication, and control
|
||||
21:32 Why EAB is not a pest in Asia
|
||||
22:34 Chemical control methods for EAB
|
||||
23:57 Importation biological control: parasitoid wasps
|
||||
28:01 Native natural enemies and the goal of balance
|
||||
29:42 Example 2: Crapemyrtle bark scale (CMBS) — overview
|
||||
31:47 CMBS biology, life cycle, and overlapping generations
|
||||
33:47 CMBS invasion timeline and early detection
|
||||
35:02 CMBS and the invasion curve in Georgia
|
||||
36:06 CMBS host range expansion in North America
|
||||
36:42 Urban heat island effects on scales
|
||||
37:28 Chemical control options for CMBS
|
||||
38:31 Natural enemies: lady beetles and lacewings
|
||||
42:04 Balancing chemical and biological control for CMBS
|
||||
42:25 Example 3: Orange-striped oakworm moth — overview
|
||||
43:53 Oakworm life cycle and seasonal timing
|
||||
44:51 Why urban and clonal trees are vulnerable
|
||||
46:35 Natural enemies of the oakworm
|
||||
47:56 Control decisions: damage thresholds and Btk
|
||||
49:19 Presentation wrap-up and key takeaways
|
||||
50:01 Moderator comments on CMBS expansion in Georgia
|
||||
|
||||
---
|
||||
|
||||
### Questions & Answers
|
||||
|
||||
**Q: What is the disease triangle, and why is it important for understanding tree pest damage?**
|
||||
A: The disease triangle describes how damage to a tree results from the interaction of three components: the pest, the host tree, and the environment. Damage is not caused by the pest alone — a susceptible tree in a stressful environment amplifies the impact. Dr. Graziosi emphasized that this framework helps professionals identify which factors they can influence when managing pest problems, particularly in urban settings where environmental stress is high.
|
||||
|
||||
**Q: What is the spiral of tree decline, and how does it relate to tree death in urban environments?**
|
||||
A: The spiral of tree decline is a diagram with three levels of stressors — predisposing factors (such as soil compaction and genetic potential), inciting factors (such as defoliating insects and drought), and contributing factors (such as wood-boring insects, nematodes, and Armillaria). Each level can independently bring a tree to death, and urban environments intensify these stressors. The key takeaway is that tree death typically results from multiple interacting factors rather than a single cause.
|
||||
|
||||
**Q: How does firewood movement contribute to the spread of the emerald ash borer?**
|
||||
A: The movement of infested firewood by campers and travelers was the primary pathway for EAB's rapid spread across North America. Researchers were able to connect the pattern of EAB spread closely with the highway and freeway system. This led to the "Don't Move Firewood" campaign, which also helps contain other invasive insects such as the Asian longhorned beetle.
|
||||
|
||||
**Q: Why is the emerald ash borer not considered a pest in its native range in Asia?**
|
||||
A: Two main reasons explain this. First, native Asian ash species co-evolved with the EAB and are resistant or less susceptible — only very weak, stressed trees are attacked there. Second, a community of specialist natural enemies, including parasitoid wasps, keeps EAB populations low in Asia. This understanding directly informed both the chemical protection approach (making North American trees artificially resistant) and the importation biological control program.
|
||||
|
||||
**Q: What are the chemical control options for protecting ash trees from the emerald ash borer?**
|
||||
A: Three main application methods are available: tree injection, bark spray, and soil drench. Some products can be applied by homeowners while others require a professional applicator. Timing is important — for example, soil drench needs to be applied in spring before leaves emerge. Dr. Graziosi noted that chemical protection remains critical for saving individual high-value trees, since biological control has not yet been fully successful for EAB in North America.
|
||||
|
||||
**Q: Why is trunk injection not effective for controlling crapemyrtle bark scale?**
|
||||
A: Crapemyrtle does not absorb systemic insecticides well through trunk injection — the chemical moves very slowly through the plant, making it an ineffective delivery method. Instead, soil drench, soil injection, and foliar sprays are the recommended chemical control approaches for CMBS. Soaps can also be used to target crawlers, the young mobile nymphs.
|
||||
|
||||
**Q: What native predators help control crapemyrtle bark scale, and what are their limitations?**
|
||||
A: Three lady beetle species — the twice-stabbed lady beetle, the bigeminal lady beetle, and the non-native Harlequin lady beetle — are active predators of CMBS, feeding on both nymphs and adults. Green lacewings, particularly the red-lipped green lacewing, also prey on CMBS nymphs and eggs and are commercially available. However, these predators are generalists that often arrive late in the season and do not build sustained populations on infested trees, limiting their effectiveness as standalone control agents.
|
||||
|
||||
**Q: How should a landscape professional decide whether to treat for orange-striped oakworm?**
|
||||
A: Dr. Graziosi outlined a two-part decision framework. First, distinguish between aesthetic damage and actual harm to the tree — the threshold is approximately 25% defoliation. Second, assess the season: late-season defoliation, even if substantial, is less harmful because the tree has already stored its nutrients. Treatment is most warranted for young or small trees experiencing significant early-season defoliation.
|
||||
|
||||
**Q: Why are urban landscape trees particularly vulnerable to the orange-striped oakworm?**
|
||||
A: Urban landscape trees are often clonal nursery stock with very low genetic variability. Dr. Graziosi used the example of Nuttall oaks on the UGA Athens campus — beautiful, high-quality trees that are essentially genetically identical, meaning the susceptibility of one tree is the susceptibility of all. Combined with urban heat island effects that accelerate insect development, this creates conditions favoring pest outbreaks.
|
||||
|
||||
**Q: What is importation biological control, and how has it been applied to the emerald ash borer?**
|
||||
A: Importation biological control involves studying the natural enemies that effectively control a pest in its native range and introducing them to the invaded region. USDA conducted risk assessments and introduced three specialist parasitoid wasp species from Asia to target EAB. Two species attack EAB larvae under the bark using ovipositors to locate them through vibrational cues, while the third parasitizes EAB eggs. These wasps are specialists that only attack EAB, ensuring they won't harm other insects.
|
||||
|
||||
**Q: What is the significance of the white fringetree for emerald ash borer management in Georgia?**
|
||||
A: The white fringetree, which belongs to the same family (Oleaceae) as ash, was discovered in 2014 to be an alternate host for the EAB. This is significant not only because it means another native plant species is at risk, but more importantly because white fringetree can serve as a population reservoir, allowing EAB to persist in an area even after all ash trees are gone. This has direct implications for long-term management strategies in Georgia.
|
||||
|
||||
---
|
||||
|
||||
### Additional Resources
|
||||
|
||||
- Dr. Graziosi referenced QR codes linking to UGA publications on EAB status and control in Georgia, the full insecticide protocol for EAB, and CMBS biology and management.
|
||||
- The iTree tool suite for calculating ecosystem services and benefits of trees, and for right-tree-right-place selection, is available at [itreetools.org](https://www.itreetools.org).
|
||||
- Submit sign-in sheets for CEU credit to gtbop@uga.edu or mail to the address on the sign-in sheet.
|
||||
|
||||
---
|
||||
|
||||
*Getting the Best of Pests (GTBOP) is a continuing education webinar series for pest management and Green Industry professionals, hosted by the University of Georgia Center for Urban Agriculture.*
|
||||
|
||||
*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
|
||||
@@ -1,7 +1,76 @@
|
||||
# YouTube Description — Graziosi, Tree Pests
|
||||
|
||||
> **Placeholder** — Paste your Stage 3 pipeline output here.
|
||||
# GTBOP YouTube Description
|
||||
## Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
---
|
||||
|
||||
*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
**Copy everything below this line into the YouTube description field:**
|
||||
|
||||
---
|
||||
|
||||
Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies | GTBOP Webinar Series
|
||||
|
||||
Dr. Ignazio Graziosi, Assistant Professor in the Warnell School of Forestry and Natural Resources at the University of Georgia, presents a framework for understanding tree pest damage through ecological interactions. Using the disease triangle and spiral of tree decline, he examines how the pest, host tree, and environment interact to produce damage — particularly in stressful urban settings.
|
||||
|
||||
Three case studies illustrate different ecological scenarios: the emerald ash borer (EAB), a non-native pest devastating native ash; crapemyrtle bark scale (CMBS), a non-native pest on non-native crapemyrtle; and the orange-striped oakworm moth, a native pest on native oaks. For each, Dr. Graziosi explores host susceptibility, environmental factors, natural enemies, and chemical and biological control strategies, providing a practical decision-making framework for landscape professionals.
|
||||
|
||||
Presented January 15, 2026 | Getting the Best of Pests (GTBOP) Webinar Series | Green & Commercial
|
||||
Hosted by the UGA Center for Urban Agriculture
|
||||
Moderator: Dr. Bodie Pennisi, UGA Horticulturist
|
||||
|
||||
⏱️ TIMESTAMPS
|
||||
0:00 Introduction and speaker credentials
|
||||
1:28 The disease triangle: pest, tree, and environment
|
||||
3:02 The spiral of tree decline
|
||||
6:07 Native vs. non-native pest and tree interactions
|
||||
7:22 Example 1: Emerald ash borer (EAB) — overview
|
||||
8:23 EAB life cycle and damage symptoms
|
||||
10:48 EAB generation time and temperature effects
|
||||
11:57 EAB spread across North America and firewood
|
||||
13:47 EAB in Georgia and native ash species diversity
|
||||
15:26 White fringetree as alternate EAB host
|
||||
16:43 Global trade and non-native species introductions
|
||||
18:20 The invasion curve: detection, eradication, and control
|
||||
21:32 Why EAB is not a pest in Asia
|
||||
22:34 Chemical control methods for EAB
|
||||
23:57 Importation biological control: parasitoid wasps
|
||||
28:01 Native natural enemies and the goal of balance
|
||||
29:42 Example 2: Crapemyrtle bark scale (CMBS) — overview
|
||||
31:47 CMBS biology, life cycle, and overlapping generations
|
||||
33:47 CMBS invasion timeline and early detection
|
||||
35:02 CMBS and the invasion curve in Georgia
|
||||
36:06 CMBS host range expansion in North America
|
||||
36:42 Urban heat island effects on scales
|
||||
37:28 Chemical control options for CMBS
|
||||
38:31 Natural enemies: lady beetles and lacewings
|
||||
42:04 Balancing chemical and biological control for CMBS
|
||||
42:25 Example 3: Orange-striped oakworm moth — overview
|
||||
43:53 Oakworm life cycle and seasonal timing
|
||||
44:51 Why urban and clonal trees are vulnerable
|
||||
46:35 Natural enemies of the oakworm
|
||||
47:56 Control decisions: damage thresholds and Btk
|
||||
49:19 Presentation wrap-up and key takeaways
|
||||
50:01 Moderator comments on CMBS expansion in Georgia
|
||||
|
||||
❓ Q&A HIGHLIGHTS
|
||||
|
||||
Q: What is the disease triangle?
|
||||
A: Damage results from the interaction of the pest, the host tree, and the environment — not the pest alone.
|
||||
|
||||
Q: How does firewood spread the emerald ash borer?
|
||||
A: Infested firewood was the primary pathway for EAB's rapid spread, closely matching the highway system and leading to the "Don't Move Firewood" campaign.
|
||||
|
||||
Q: Why is trunk injection ineffective for crapemyrtle bark scale?
|
||||
A: Crapemyrtle absorbs systemic insecticides very slowly. Soil drench, soil injection, and foliar sprays are recommended instead.
|
||||
|
||||
Q: When should you treat for orange-striped oakworm?
|
||||
A: The threshold is about 25% defoliation. Late-season defoliation is less harmful. Btk is effective against young larvae with minimal impact on natural enemies.
|
||||
|
||||
📚 RESOURCES
|
||||
• Submit sign-in sheets for CEU credit: gtbop@uga.edu
|
||||
• iTree tools for calculating tree benefits: itreetools.org
|
||||
• QR codes for UGA extension publications on EAB and CMBS were shown during the presentation
|
||||
|
||||
🔗 ABOUT GTBOP
|
||||
Getting the Best of Pests (GTBOP) is a continuing education webinar series for pest management and Green Industry professionals, hosted by the University of Georgia Center for Urban Agriculture.
|
||||
|
||||
#TreeHealth #EmeraldAshBorer #CrapemyrtleBarkScale #PestManagement #IPM #Arboriculture #UGA #GTBOP #ContinuingEducation #UrbanForestry #BiologicalControl
|
||||
|
||||
@@ -1,7 +1,239 @@
|
||||
# Prose Transcript — Graziosi, Tree Pests
|
||||
# Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
## GTBOP Green Industry Series — January 15, 2026
|
||||
|
||||
> **Placeholder** — Paste your Stage 5 pipeline output here.
|
||||
**Speaker:** Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
**Moderator:** Dr. Bodie Pennisi, Horticulturist, University of Georgia
|
||||
**Duration:** 52:11
|
||||
|
||||
---
|
||||
|
||||
*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
## Introduction
|
||||
|
||||
**Bodie Pennisi:** Welcome back, everyone. Our second speaker is Dr. Ignazio Graziosi, who is an assistant professor in Warnell School of Forestry at University of Georgia. Dr. Graziosi studies tree health and raises awareness of the benefits provided by trees. As a field biologist, he has studied the impact of invasive species — insects and microorganisms — on tree health and used this knowledge to develop management and surveillance tools while engaging land managers and the public in education programs. In his early career as a forester, he focused on the management of natural and urban trees. Dr. Graziosi has held positions with non-governmental and governmental organizations, universities, and private companies in different countries. His work involves field and laboratory studies, data collection and analysis, development of protocols, use of photography, team project and partnership coordination, capacity building, education, and outreach. And Dr. Graziosi, the floor is yours from Italy.
|
||||
|
||||
**Ignazio Graziosi:** Thank you. Thank you, Bodie. Good afternoon, everybody. Give me one sec that I'm going to click the magic button. All right. Can you hear me all right and see my screen? Fantastic. It's great to be here. Thank you again.
|
||||
|
||||
---
|
||||
|
||||
## The Disease Triangle
|
||||
|
||||
So we are all dealing with a variety of different tree pests. You can see on the screen a couple of examples. There is a woolly adelgid. We have fall webworm, caterpillar, beetles, scales — and we tend to concentrate on the pest itself because it's what produces damage to our trees. But it is important to remember that it is always a team result. We have the pest, yes, but there are other actors in the picture that cause the overall damage. Of course, we have the tree itself and we have the environment. And the damage on the tree, the damage from the pest and from the disease, is caused by the interaction of these three components. And this is the concept of the disease triangle. So the damage is not caused by just one component. The pest alone is not enough, but it is the interaction with the tree, which for example is susceptible, and the environment. And we are dealing with trees, especially in the landscape, for the focus of this webinar, and in urban environment. And in those environments, the situation gets worse.
|
||||
|
||||
---
|
||||
|
||||
## The Spiral of Tree Decline
|
||||
|
||||
And I introduce to you the spiral of tree decline. And this is a diagram that was developed in the 90s and is really useful to understand this concept one step more. So how does this diagram work? You see three different levels of spirals. Each spiral is a family of factors that add stress to the tree at different levels. A lot of those are similar to the stressors that Dr. Klein presented at the beginning of his presentation. And all these different families of stressors, they end up eventually with the death of the tree. And you see at the center of the death spiral, there is in fact the death of the tree.
|
||||
|
||||
And if we look at those three spirals one by one, we can see, for example, the first one that is called the predisposing factor — general stressors. The urban environment of course is stressful for the tree, there is the genetic potential of the tree itself, and again it's a demonstration that the disease triangle is really important. And then we have well-known stressors like soil compaction, which is often the number one issue for many trees. And then we have another spiral that is closer to the center of our death spiral, which is called here inciting factor, and we have defoliating insects, for example, we have drought. And then we have an even more internal spiral which is contributing factor, and you see a lot of biotic factors. You have fungi, wood-boring insects, nematodes, Armillaria for example.
|
||||
|
||||
The important thing to understand of this diagram is that each of the spirals — the predisposing factor, the inciting factor, and the contributing factor — contain factors that can directly bring the tree to death. If you see, I'm not sure if you are able to see my pointer that I'm using on the screen.
|
||||
|
||||
**Bodie Pennisi:** Yes, we are.
|
||||
|
||||
**Ignazio Graziosi:** Fantastic. Thank you, Bodie. And you can see these lines here. These lines mean that each of these factors — for example, urban environment alone or soil compaction alone — are able to cut through the different layers of the spiral and bring the tree directly to death. One important message to take home from this diagram is that the health of the tree and potentially the death of the tree is an interaction between many factors.
|
||||
|
||||
---
|
||||
|
||||
## Native and Non-Native Pest Interactions
|
||||
|
||||
And if we go back to our slide visualizing different pests that we have to deal with, we have here non-native pests. We have examples of native pests. We have examples of native trees, examples of also exotic trees. And understanding the interaction among those — native pests attacking native trees and vice versa, non-native attacking native and native attacking non-native — is really important because it allows us to understand the mechanism and to understand what are the general strategies we can use to manage and control those pests. And this is true for many different pests.
|
||||
|
||||
So I'm bringing to you three examples, three stories if you want, that investigate, explore different scenarios and present to us some important components of this interaction that will help us to deal in the future with a variety of different pests.
|
||||
|
||||
---
|
||||
|
||||
## Example 1: Emerald Ash Borer — A Non-Native Pest on Native Trees
|
||||
|
||||
So the first one, the first example, the first story for you is a native tree impacted by a non-native pest. And this is the very famous case, the superstar of insect pests, the emerald ash borer. So the emerald ash borer — I'm sure many of you are familiar with it — on the picture on the left is a canopy dieback caused by the insect. And remember, when you see canopy dieback caused by the emerald ash borer and you identify the problem to be that, the emerald ash borer, that means that the insect has been spreading in the area for at least 5 to 10 years. And then you see on the right that is the damage at a stand or forest level.
|
||||
|
||||
### EAB Life Cycle and Damage
|
||||
|
||||
So a very quick summary of what the EAB, emerald ash borer, is about. Larvae feed under the bark and doing so disrupt the phloem, the cambium, the outer xylem, and it cuts off the movement of nutrient and water. And trees, they can die very fast. This is an overview of how the damage happens. And if you start from the picture on the left, you see a young tree that is debarked, and you see the gallery caused by the feeding larvae, and you see that the tree is desperately trying to sprout. It has a reaction to the attack, and the water sprouts are actually a very important diagnostic feature in order to understand if a tree is attacked by the emerald ash borer.
|
||||
|
||||
And if you get closer to the tree, you can actually see the larvae, like here, that is feeding. This is a fourth instar, is a mature larva, is probably around two inches long. And by feeding, it basically disrupts all the cambium tissue and the outer xylem. And then, after the larva completes its development, which is usually at the end of the season, it folds in a J-shape and gets a little bit deeper in the outer wood, and it starts kind of sleeping, and overwinters as what is called a J-larva, or prepupa. And then at the end of the winter, it pupates and emerges in spring. You can see the shiny green beetle that is emerging from a tree. And while it emerges, it leaves a very characteristic, the famous D-shaped exit hole.
|
||||
|
||||
This is another way to represent the life cycle of the insect. We can start from here, where the insect again comes out from the tree, leaving the D-shaped hole, and then mates. The female lays eggs in the cracks of the bark. From the egg, a larva hatches, goes through the bark and starts feeding and causing the galleries you already saw in the previous photos. And then it pupates and will emerge again the following year.
|
||||
|
||||
### Generation Time and Temperature
|
||||
|
||||
Here it is important to remember that this is usually mostly a one-generation-per-year insect. But there is always a part of the population of the emerald ash borer in any location that requires two years instead of one to develop. And this is true especially in the northern part of North America, where temperatures are lower. As we know, temperature usually increases the development of insects. And so the colder it is, the slower it develops. So at northern latitudes in North America, a larger part of the local populations of emerald ash borer requires two years to develop. And it is important to know when we have to deal with this insect to control it.
|
||||
|
||||
### Spread Across North America
|
||||
|
||||
It was found, was discovered in 2002 in the Detroit area, which means again, as I pointed out earlier, it was present in the area already for at least 10 years. And then you see all the little red dots. Yes, it took North America, as we know, by storm. This is one of the last available maps from USDA. This is 2023, because in 2021, I believe, the quarantine was lifted at federal level. It was lifted because there was no hope to contain the insect through quarantine.
|
||||
|
||||
And then the invasion of North America by the EAB was caused by one single individual cause. There was one culprit that allowed the EAB to move so quickly all over the United States. And I let you guess — you can write your answer if you have an idea in the chat box. I will not be able to see it right now, but I will go later and check.
|
||||
|
||||
And this is, of course, firewood. Campers and travelers, they move infested firewood to the next city, to the next county, to the next state. And this really is what determined a lot of the pathways of the invasion in North America. They were able to connect very closely the pattern of the spread with the highway and freeway system. There is one good thing that came out from this disaster, which is the "Don't Move Firewood" campaign. This is a very effective and important campaign that helps, for example, contain other invasive insects, such as the Asian longhorned beetle.
|
||||
|
||||
### EAB in Georgia and Ash Species Diversity
|
||||
|
||||
Okay, so we know that as the EAB spread in North America, it attacked and impacted heavily the native species of ash. In Georgia, for example, there is of course the emerald ash borer, and this is a spread — I would say the southern edge of the invasion, so it's still spreading. This map is from 2020. So there is active surveillance, it's present in the Athens area of course, and even a little bit further south. So you may think that it's not very important, is not as important as fighting against the emerald ash borer in Georgia compared to other states. It's true, there are other states where there is a continuous presence and availability of ash, and Georgia is more scattered. But if we start looking at the distribution of ash species in Georgia, we see that it is really important for biodiversity and actually the state hosts multiple species of ash. We have green ash statewide, we have blue ash, which is an interesting tree because it shows a little bit of resistance against the emerald ash borer — it will die eventually, but it will take way longer compared to other species of ash. We have white ash, Carolina ash which is a southern ash, we have Biltmore ash which is a subspecies of white, we have pumpkin ash on the southern part of the state, swamp white and small ash.
|
||||
|
||||
### White Fringetree as Alternate Host
|
||||
|
||||
And then there is another plant that unfortunately is important for the ecology of the emerald ash borer, and it's a surprise that happened in 2014, when they discovered that the EAB was able to expand its host range and attack a native plant in North America, which is the white fringetree — which is the same family, Oleaceae, as ash. And this is present also in Georgia. It's important to know that because not only could it be a damage for the white fringetree, but more importantly, the white fringetree could function as a reservoir for the population of the EAB, even though all the other ash trees in the area are gone. So the EAB can stay in an area utilizing the white fringetree.
|
||||
|
||||
### Global Trade and Non-Native Species
|
||||
|
||||
Okay, so we know that the EAB is non-native and we know that it is from Asia. So if we look at the map where it was in Asia and where it is now in North America, spreading and causing damage, we may ask — how did it get there? Of course we know, through trade. This is a photo in the port of Savannah. And we know that this accidental introduction through trade of non-native species is not a new trend, but is an exponentially increasing trend. And you can see here an example from different parts of the world. So it is really exponentially increasing. One reason is that our ability to detect species has increased as well, improved. But trade is increasing, of course, and the introduction of non-native species is reflecting this globalization.
|
||||
|
||||
If you go near potential ports of entry, such as airports and ports, you may notice traps. This is a generic trap in the port of Savannah. This is another example since we are talking about the EAB. This is the trap that is designed to catch the EAB — it's a series of interconnected funnels. There is a pouch, which is the green pouch there, that is a lure that produces an attractant for the EAB. The EAB arrives, hits the funnel, and it falls in the cup. These types of traps, they are not designed to catch as many beetles as possible to remove them from the environment. It's just a detection, but it's a very important detection methodology.
|
||||
|
||||
---
|
||||
|
||||
## The Invasion Curve
|
||||
|
||||
Okay, we know of the damage, as the EAB spread in North America it caused immense damage to the native population of ash. And we have another tool here I want to present to you, because it's a useful tool to understand the strategy to manage non-native and native pests alike, which is the invasion curve. This is a diagram that illustrates the growth of a population of a pest, which here is called pest prevalence, over time.
|
||||
|
||||
So the story starts with the introduction, when the pest arrives in the area. After the introduction, of course, the population of the pest, the prevalence, is still low. And then it starts growing and start multiplying and feeding on the host. And then it enters exponential growth. And this is when land managers, for example, start to be aware. And it's a little bit more time before the public starts to be aware. And by the time the public starts to be aware, usually the population is already really high until it reaches a plateau which is the so-called carrying capacity — what is that, for example, is where or when all the ash trees in the area are gone, so the population of the pest cannot grow anymore.
|
||||
|
||||
This diagram is important because it can be connected with our ability to deal with and control the pest. When the population is really low, right after the introduction, we can even try to eradicate a pest. Of course, it's very difficult, but in some cases, for some pests, it's not impossible. We can do prevention, for example. But then as the pest prevalence starts to grow, it's really impossible to eradicate. And then the only control that is possible is a local control — for example, just trying to save individual trees. But as the prevalence and the difficulties of controlling a pest grow, the cost associated with the control grows as well. And this is really important to understand. And this is why detection is so important, and ideally we want to have effective tools to detect a pest as close to the introduction event as possible, because everything is easier and is possible.
|
||||
|
||||
---
|
||||
|
||||
## Why EAB Is Not a Pest in Asia
|
||||
|
||||
Okay, so as we understand how an invasion works, we can look at the map again and we can ask ourselves — okay, we know that the emerald ash borer is non-native, is from Asia. And it's a pest here, but what about in its native range? What about in Asia? Was it a pest? The answer is no. And there are multiple reasons for that, and they will relate to our disease triangle.
|
||||
|
||||
The first reason is that the native species of ash in Asia, they say, co-evolved with the pest, which means they are less susceptible or resistant. And the only ash trees — Asian species of ash trees — that can be attacked by the EAB in Asia are very weak and stressed trees. That's one important reason. And this is why one of the approaches to control the EAB is to artificially make them resistant through chemical protection.
|
||||
|
||||
### Chemical Control for EAB
|
||||
|
||||
Of course, this is just a visual summary of the technology that I'm sure you are familiar with. There is tree injection, bark spray, and soil drench. I want to give just a little flash and overview of the chemical control methodology for the EAB. And there are a few involving systemic insecticides. Some of them can be applied by homeowners. Some of them, of course, need a professional applicator. And you have to choose carefully which one, depending on the season — for example, soil drench needs to be applied in the spring before leaves are out. I leave you here two links, two QR codes. I encourage you to check them. One is an overview of the status and the control of the EAB in Georgia. And the one on the bottom on the left is the full protocol for insecticide control for the EAB.
|
||||
|
||||
### Importation Biological Control
|
||||
|
||||
Okay, we are still trying to answer our question — why is it not a problem in Asia? One reason is the trees are resistant, but there is another reason. The other reason is that the population of the EAB there is kept in check by a community of natural enemies. These are predators, are parasitoids — and we will see later what a parasitoid is — that are able to attack the EAB and to keep the population low.
|
||||
|
||||
Okay, so why don't we bring them over? That's exactly what we did. And this is called importation biological control, where you go there, you study the natural enemies that are effective in the native range, and you bring them over. USDA did that after risk assessment and introduced a few different species. And you see here three tiny wasps. Those wasps are parasitic wasps, or parasitoids. The first two, the one on the left and the one on the center, they attack the larvae of the EAB. The one on the right attacks the eggs. And those are specialists. What that means is that they only attack the EAB. They don't attack any other insect. And so this warrants success in a way, because they cannot start attacking another insect and kind of waste their potential.
|
||||
|
||||
How do they work? Okay, let's start with the first one here, the one on the left. And you see it's a small wasp and has a kind of a long tail. Its tail is an ovipositor, and it uses its ovipositor to find trees that are infested with the EAB and drill through the bark. It is able to use vibrational cues to understand if there is a larva under the bark and exactly where it is, and it stings the larvae of the EAB and it puts its own eggs in the larvae. Think about the movie Alien — Alien 1, not Alien 3, because the life cycle in Alien 3 gets very complicated — but in Alien 1 is exactly how it works. Inside, there will be the larvae of the wasp that feeds in the body of the larvae of the EAB, eventually consuming the whole animal.
|
||||
|
||||
The infographic that you see on the slide is the technology that is used to release it. This is a log prepared in the lab that is filled with larvae of the EAB infested with the parasitoid wasp. You hang them on a tree, the adult wasps will eventually fly out and find other trees infested with the EAB to be parasitized.
|
||||
|
||||
The second one is the egg parasitoid. I think you know the story now. It works exactly the same way — it attacks eggs. The technology is a small container. You can see in the picture on the bottom right, it's a drugstore container, called the O-binator. It contains a paper where there are eggs of the EAB that have been parasitized with this parasitic wasp. Look now at the picture in the center. These brown circles are the eggs of the EAB. If you look at the one on the bottom, you can see that inside there is actually a tiny baby larva of the EAB that is waiting to hatch. But if you look at the other two, the dark ones, you see that inside there is something different. That is the wasp that is ready to emerge.
|
||||
|
||||
### Native Natural Enemies and the Goal of Balance
|
||||
|
||||
Okay, so we understand about biological control now, the importation biological control, but you may ask — okay, so we are in North America. What about our native natural enemies? The answer is yes, we have some. There are many species that have been described of parasitic wasps or other types of insects, but those are not specialists. They can attack also other types of insects. So they are not effective in providing — they cannot be the only ones that can provide control. Alone, they are not enough.
|
||||
|
||||
So at the end of the story, what we want to reach for the EAB, and in general for many non-native pests attacking native trees, is balance between the susceptibility of the plant and the community of natural enemies — both native natural enemies and also biological control. But also in the picture there is the chemical protection that is really important, especially to save trees of great value. Because it's true that biological control in North America for the EAB hasn't been fully successful yet, but we can still save large trees of big value in the city and the landscape using chemical protection.
|
||||
|
||||
---
|
||||
|
||||
## Example 2: Crapemyrtle Bark Scale — A Non-Native Pest on Non-Native Trees
|
||||
|
||||
Okay, so we are ready for our second example — a non-native tree that is attacked by a non-native pest. And this is an example that may be relevant for us in the South, which is the crapemyrtle bark scale.
|
||||
|
||||
So the crapemyrtle bark scale — you can see here in the center — is of course a non-native scale attacking our beloved crapemyrtle. There is a huge crapemyrtle culture in the South. There are hundreds, I think, of different cultivars belonging to different species — it's not only *Lagerstroemia indica*, but there are hybrids of different species, different color, flower, texture of the bark, size. And of course, it's easy to be judgmental toward the crapemyrtle because it's so commonly used and you can say it's used too much. It's true. It's easy to be judgmental, but it's important to remember a couple of things. One is that crapemyrtles provide benefits. And you can see here a little report that has been prepared using this tool called iTree. If you are not familiar with iTree, it is a suite of different tools that can be extremely useful to calculate benefits, so-called ecosystem services of trees, but also can be used to select the right tree for the right place. The second reason is that regardless of how much the crapemyrtle is planted in the South, we have to deal with this pest because it will create damage. We will have to deal with removal of attacked trees or the control of the pest itself.
|
||||
|
||||
### CMBS Biology and Life Cycle
|
||||
|
||||
Okay, so the crapemyrtle bark scale, starting from the picture on the left. This is a twig of a crapemyrtle — of course you see the white specks, those are individual, mostly females, of the crapemyrtle bark scale, CMBS in short. Why is it black? Because like aphids, of course, scales while they feed secrete droplets of sugary sap. And so black sooty molds grow on that. On the picture in the center, different things. Those white lumps are mostly mature females of the scale, but you can also see here immature female nymphs. And this is important for the life cycle. On the right you see a female, and if you flip the female you see the eggs. Those very nice pink colored ones are eggs.
|
||||
|
||||
The life cycle involves both males and females. The male is actually winged; the female is not winged, and a mature female loses her legs and cannot move. One of the things that complicates control is that it's not clear how many generations there are. They describe up to five generations, but the problem is that they are overlapping. So at one point, at any point, you may find different stages of the insect. If I go back one slide, the picture in the middle here has been shot one month ago in Athens, so in the winter. And you can see there are nymphs and adults. The nymphs are called crawlers.
|
||||
|
||||
### CMBS Invasion Timeline
|
||||
|
||||
Okay, what is the situation? It was found in 2004 in Texas — of course a huge crapemyrtle culture state — and then in 2014 in Georgia, and only in 2018, unfortunately, was found in nurseries in Georgia. The QR code I put there is a summary of the status and the biology of the crapemyrtle bark scale from UGA. So if you are interested, please snatch that.
|
||||
|
||||
### CMBS and the Invasion Curve in Georgia
|
||||
|
||||
Okay, so we already know the invasion curve, what it means, and it's really important for the crapemyrtle bark scale. Even though it's already present in the South, even though it's already present in Georgia, to be able to detect it as soon as possible — it's not everywhere yet. In Athens, it got there, I think, in 2021. And you can see it in high numbers on some trees, but there are a lot of trees with very low infestation. So I would say we are at the beginning of the invasion in a lot of places in Georgia. So we are in the situation where we can do well because we are at the point on the invasion curve where the population is not so high that our control can mean something.
|
||||
|
||||
### CMBS Host Range in Asia and North America
|
||||
|
||||
Alrighty, let's go back to our well-known map. So we know that it is non-native, comes from Asia. So we may ask, okay, what about the host there? The bad news is that this insect in native Asia can feed on many different species of plants. It's not a specialist, so it can feed on apple in Asia, and soybean — it has been found on fig. One good news is that since there are so many, they were able to find some cultivars, some species of crapemyrtle that have low susceptibility. And for example, the species *Lagerstroemia speciosa* — they are studying this still, though.
|
||||
|
||||
Okay, so those are the plants in Asia. What about the plants in North America? We know that it attacks basically most of the cultivars of the crapemyrtle, but unfortunately, like the EAB was able to find the white fringetree, the crapemyrtle bark scale started to feed happily on American beautyberry and also on St. John's wort. So this can be a problem, of course, because it can go around attacking other plants.
|
||||
|
||||
### Urban Heat Island Effects
|
||||
|
||||
Okay, we are familiar with the disease triangle, so we may ask — okay, what about the role of the environment? What is the role of the environment here? Unfortunately, again, scales are one of the groups of insects that most take advantage of urban heat island. Urban heat island, of course, is the phenomenon that causes temperatures due to hardscape in the city to be even 10 degrees higher. And this has two effects. First of all, it stresses trees and they become more susceptible to pests. Second, it accelerates the development of the insect itself. And scales are very good at taking advantage of that.
|
||||
|
||||
### Chemical Control for CMBS
|
||||
|
||||
Okay, let's go to some good news — the tools, the weapons we have to control it. So this is an overview, again, of the chemical control available for the crapemyrtle bark scale. We have soil drench, we have soil injection, we have foliar sprays, and also some soaps — they can be used mostly to target crawlers, which again are the small, the young nymphs, like the pinkish one in the photo here. You can see in the table different product brand names and how they can be applied. And I encourage you again to snatch that QR code because it will give you the full protocol that you can use.
|
||||
|
||||
The control, the chemical control, is complicated by the fact that crapemyrtle is not good at absorbing systemic insecticide through trunk injection. The chemical moves very slowly, so that is not a viable option, unfortunately.
|
||||
|
||||
### Natural Enemies: Lady Beetles and Lacewings
|
||||
|
||||
Okay, we know about natural enemies, so we may ask now, looking at our map, what is the situation for this pest? Yes, in Asia, there is a healthy community of predators and parasitic wasps that worldwide and in Asia can attack it. In the US, they were not able yet to clearly find an effective parasitoid, but there are many predators that can feed on the crapemyrtle bark scale, and they are used to try to control it.
|
||||
|
||||
So this is my last question for you, if you have any idea of what this is. Okay, so those are eggs of lady beetles, because lady beetles — different species of lady beetles — are avid, hungry predators of the crapemyrtle bark scale. There are three main species: the twice-stabbed lady beetle, the bigeminal lady beetle, which looks like the twice-stabbed but is a completely different species, and also the non-native Harlequin lady beetle. These species will find trees infested with the crapemyrtle bark scale and they will feed on nymphs and adults alike.
|
||||
|
||||
So they help — yes, they do help — but often they arrive too late in the season and they are not specialists. They will feed on other prey, which means they will not stay for many generations on the tree, providing continuous control. And that is a problem.
|
||||
|
||||
So this is another question for you. This of course is an egg from another predator that would happily feed on the crapemyrtle bark scale. It's called a stalked egg. This is a beautiful egg of lacewings. One species in particular, the red-lipped green lacewing, feeds and predates on crapemyrtle bark scale nymphs and eggs as well. And you can see on the sequence on the right, this is a larva of the lacewing, which are the most voracious. Do they work? Yes, they are actually available commercially, of course, to control different pests including CMBS. But the problem is they don't build up a population on the plant, like the previous case. And also adults need to feed on sugar. And this means that you have to continuously, through the season, release them. So just one release at the beginning of the season is not enough. But they are commercially available and they can be used.
|
||||
|
||||
### Balancing Chemical and Biological Control
|
||||
|
||||
Of course, you need to do chemical control very carefully because it has the potential to interfere with the biological control. At the same way as for the EAB, what we want in the future is a balance. We want the population of the scale low because the community of natural enemies is healthy, but we want to use and we want to do additional research to find effective chemical control that maybe is more compatible with the natural enemies.
|
||||
|
||||
---
|
||||
|
||||
## Example 3: Orange-Striped Oakworm Moth — A Native Pest on Native Trees
|
||||
|
||||
Okay, this brings me to the last, I would say, five to eight minutes, which is the last story in my presentation — a native tree impacted by a native pest. And our example is the orange-striped oakworm moth.
|
||||
|
||||
So this, of course, is a very well-known pest of oaks, especially red oaks in the group of the red oaks, but can feed on other plants including hickory, birch, and maple. On the left, it's interesting because you can see that the skeletonizing damage is the one that is done by the baby larvae after hatching. And then as they grow, they start feeding on the entirety of the leaf lamina. And in some cases, extreme cases, especially for small trees, they can completely strip a tree. And this tree, the photo on the right, is in early August. And it's a young, but not super young tree. It's a willow oak that was completely defoliated.
|
||||
|
||||
### Oakworm Life Cycle and Seasonal Timing
|
||||
|
||||
Okay, a little summary — I know a lot of you are already familiar with it — it is of course a late summer and fall season pest that overwinters as a pupa and produces in the South two generations per year. So we can start here. The adults mate and the female lays eggs on the underside of leaves in late summer. And then young larvae initially feed all together on the same branch where they hatched. And then as they grow, they disperse a little bit because they need a lot of leaves. And then again, they can defoliate — in some cases they can defoliate completely a tree, but those cases are quite rare and exclusively for small trees. And at the end of the season, after, for example for the South, the second generation is complete in the fall, with the first cold the larvae drop to the ground and they will pupate in the first five inches in the ground.
|
||||
|
||||
### Why Urban and Clonal Trees Are Vulnerable
|
||||
|
||||
Okay, so we can use our map as a tool to ask questions. Okay, it's a native pest. Why does it cause or can it cause so much damage? What about the plant? What about the other factors we looked at together earlier for the other two pests?
|
||||
|
||||
First of all, of course, it's a pest of particular relevance for urban and landscape trees and young trees. Why? Remembering this triangle — what is the role of the plant? This is an example. A lot of the trees in urban environments are trees that come from the nursery, and so are often clonal trees. The genetic variability of those trees is very low. For example, on the UGA campus in Athens, there are a lot of beautiful Nuttall oaks. But those — they come from, they are very high quality trees, but they are basically the same tree. And so the susceptibility is low. One tree means the susceptibility for all the trees on campus of the Nuttall oak is low. And so they are heavily attacked by the orange-striped oakworm moth.
|
||||
|
||||
Okay, what about the environment? An example, again — yes, in urban environments, we have the problem of heat. Again, and we know that it will stress trees, but will help the development of the orange-striped oakworm moth as well. These are some of the reasons why it can be a pest.
|
||||
|
||||
### Natural Enemies of the Oakworm
|
||||
|
||||
Okay, what about natural enemies? So right now we know all the questions we should ask. Yes, there are natural enemies that have been described. We know of them. There are various predators that feed on larvae — for example, yellow jackets and other wasps. There are various parasitoids and fungal diseases that kill the pupae, up to 10 or in some cases 20% of the pupae. And there are a lot of parasitoids that parasitize the eggs.
|
||||
|
||||
And this is important — this is an example. On the picture on the left, this is the underside of a pinnacle leaf full of eggs from the orange-striped oakworm moth. But if we look closely, we see that some of those eggs are yellow. Those eggs are empty eggs. You can see the opening here on the side. They open like a wallet, and the baby larvae already came out, so they hatched. But some other eggs — you can see this one, for example, the dark ones — they have circular openings. That means they have been parasitized. So that is a parasitoid, that is an egg parasitoid, a wasp that emerged from that egg.
|
||||
|
||||
### Control Decisions: Damage Thresholds and Btk
|
||||
|
||||
Okay, let's talk about control. So since this pest can be a pest but in some cases the damage is not so high, it's important to understand the need for control. First of all, we need to distinguish between aesthetic damage and actual damage for the plant. The threshold is around 25% of defoliation. And then we need to assess the season. Why? Because late defoliation, even if it's very substantial defoliation but occurs late in the season, is not really harmful to the tree, because the tree already stores all the nutrients. So it's not very harmful. So it's important to kind of judge the severity of the situation.
|
||||
|
||||
What can we use, though? So we can use Btk, *Bacillus thuringiensis* kurstaki, as a foliar spray, which is effective, but mostly on young instars — on young larvae. It has very little impact on natural enemies, which is good, but often needs to be reapplied. But there are also other options for contact and also systemic insecticides. I encourage you also here to take a look at the publication linked to the QR code here if you are interested.
|
||||
|
||||
---
|
||||
|
||||
## Wrap-Up
|
||||
|
||||
With that, I came to the end of my presentation. And I hope I was able to provide you some insight on what are the biological parameters and the ecological interactions you have to look at to understand what is the damage and the control that can be applied to a pest. With that, I think I will stop my sharing and I will take any question you may have. And I will ask your help, Bodie, to summarize any questions that came.
|
||||
|
||||
---
|
||||
|
||||
## Audience Discussion
|
||||
|
||||
**Bodie Pennisi:** Thank you, Ignazio. That was great. Lots of really, really excellent information. There hasn't been a question in the chat. There's lots of really good comments. Thank you. I do want to mention something. When you were talking about the crapemyrtle bark scale, unfortunately I have seen much expansion of the pest in landscapes — especially new landscapes, but even established landscapes. I mean, I was in Savannah last year, same tree. At that height, there was no evidence. I mean, again, the tree was pretty high. But this year, we were just there like two weeks ago, and it was right there. And, you know, it was a large tree too. And all across the areas around the plantings, I have visited pretty much — I would say maybe about 60 to 70% of plantings have evidence. So yeah, it's pretty bad.
|
||||
|
||||
Yeah, we just have lots of really happy people. So thank you so much again. I know you stayed late to entertain us and share with us your expertise and knowledge. So have fun, be safe, and have a safe trip back to the U.S.
|
||||
|
||||
**Ignazio Graziosi:** Thank you, Bodie. It was my pleasure. I really enjoyed it. And yeah, I'm looking forward to being in touch. Thank you. Bye-bye.
|
||||
|
||||
---
|
||||
|
||||
## Closing
|
||||
|
||||
**Rich Braman:** All right, everybody. Thanks for joining us again for the first one of these this year. And we'll see everyone in March. And just make sure you get your sign-in sheets to us at gtbop@uga.edu. And if you need to mail those to us, you'll find that mailing address at the top of the sign-in sheet. I think that's it for me, Bodie.
|
||||
|
||||
**Bodie Pennisi:** Thank you, Richie.
|
||||
|
||||
**Rich Braman:** I'm going to hang around for just a minute to make sure we don't have any procedural questions, but I'll see you soon, Bodie.
|
||||
|
||||
**Bodie Pennisi:** All righty.
|
||||
|
||||
---
|
||||
|
||||
*Transcript processed for UGA Center for Urban Agriculture / GTBOP Archives*
|
||||
*Source: Corrected SRT (Stage 1) — GTBOP_Transcript_2026-01-15_TreePests_Graziosi.srt (529 blocks)*
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Dr. Ignazio Graziosi — January 15, 2026
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<h1 id="moodle-quiz-graziosi-tree-pests">Moodle Quiz — Graziosi, Tree Pests<a class="headerlink" href="#moodle-quiz-graziosi-tree-pests" title="Permanent link">¶</a></h1>
|
||||
<blockquote>
|
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<p><strong>Placeholder</strong> — Paste your Stage 4 pipeline output here.</p>
|
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</blockquote>
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<h1 id="gtbop-moodle-quiz">GTBOP Moodle Quiz<a class="headerlink" href="#gtbop-moodle-quiz" title="Permanent link">¶</a></h1>
|
||||
<h2 id="understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies">Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies<a class="headerlink" href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" title="Permanent link">¶</a></h2>
|
||||
<h3 id="dr-ignazio-graziosi-january-15-2026">Dr. Ignazio Graziosi — January 15, 2026<a class="headerlink" href="#dr-ignazio-graziosi-january-15-2026" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Source:</strong> Corrected SRT transcript (Stage 1) + Archive Package (Stage 2)
|
||||
<strong>Questions:</strong> 15
|
||||
<strong>Difficulty Distribution:</strong> 6 Recall (40%) | 6 Application (40%) | 3 Analysis (20%)
|
||||
<strong>Coverage:</strong> Disease triangle/decline spiral (Q1–Q3), EAB (Q4–Q8), CMBS (Q9–Q12), Orange-striped oakworm (Q13–Q15)</p>
|
||||
<hr />
|
||||
<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
|
||||
<h3 id="question-1">Question 1<a class="headerlink" href="#question-1" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 1:28 – 2:32
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>According to Dr. Graziosi, the disease triangle describes the interaction of which three components that together cause tree damage?</p>
|
||||
<p>a) Pest, pathogen, and predator
|
||||
b) Pest, host tree, and environment
|
||||
c) Climate, soil, and genetics
|
||||
d) Insects, fungi, and nematodes</p>
|
||||
<p><strong>Correct Answer:</strong> b
|
||||
<strong>Explanation:</strong> Dr. Graziosi introduced the disease triangle as the interaction of the pest, the tree (host), and the environment, emphasizing that the pest alone is not sufficient to cause damage.
|
||||
<strong>Source in transcript:</strong> ~2:04–2:32, blocks 33–35</p>
|
||||
<hr />
|
||||
<h3 id="question-2">Question 2<a class="headerlink" href="#question-2" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 3:02 – 5:58
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>In the spiral of tree decline diagram, which of the following is classified as a predisposing factor?</p>
|
||||
<p>a) Defoliating insects
|
||||
b) Wood-boring insects
|
||||
c) Soil compaction
|
||||
d) Fungal pathogens</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi identified soil compaction as a predisposing factor in the outermost spiral, calling it "often the number one issue for many trees." Defoliating insects are inciting factors, and wood-boring insects and fungi are contributing factors.
|
||||
<strong>Source in transcript:</strong> ~4:08–4:31, blocks 49–52</p>
|
||||
<hr />
|
||||
<h3 id="question-3">Question 3<a class="headerlink" href="#question-3" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 5:04 – 6:06
|
||||
<strong>Difficulty:</strong> Analysis</p>
|
||||
<p>Dr. Graziosi explained that in the spiral of tree decline, each spiral level contains factors that can "cut through" directly to tree death. What is the practical significance of this for a tree care professional?</p>
|
||||
<p>a) Only contributing factors can kill a tree
|
||||
b) A single stressor from any level can be severe enough to kill a tree on its own, without the other factors
|
||||
c) Trees can only die when all three levels of stressors are present simultaneously
|
||||
d) Predisposing factors must always precede inciting factors before decline begins</p>
|
||||
<p><strong>Correct Answer:</strong> b
|
||||
<strong>Explanation:</strong> Dr. Graziosi specifically demonstrated that individual factors from any spiral level — for example, urban environment alone or soil compaction alone — can cut through the different layers and bring the tree directly to death, without requiring all other stressor levels to be present.
|
||||
<strong>Source in transcript:</strong> ~5:32–5:54, blocks 64–66</p>
|
||||
<hr />
|
||||
<h3 id="question-4">Question 4<a class="headerlink" href="#question-4" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 8:23 – 9:10
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>Which of the following is a key diagnostic sign that a tree is being attacked by the emerald ash borer?</p>
|
||||
<p>a) Sooty mold on branches
|
||||
b) Skeletonized leaves
|
||||
c) Water sprouts on the trunk
|
||||
d) Pink egg masses on bark</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi described water sprouts as "a very important diagnostic feature in order to understand if a tree is attacked by the emerald ash borer," noting they are the tree's desperate attempt to produce new growth in response to larval damage under the bark.
|
||||
<strong>Source in transcript:</strong> ~8:56–9:10, blocks 98–100</p>
|
||||
<hr />
|
||||
<h3 id="question-5">Question 5<a class="headerlink" href="#question-5" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 10:04 – 10:47
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>What is the characteristic shape of the exit hole left by an adult emerald ash borer emerging from a tree?</p>
|
||||
<p>a) Circular
|
||||
b) Oval
|
||||
c) D-shaped
|
||||
d) T-shaped</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi described the "very characteristic, the famous D-shaped exit hole" left when the adult beetle emerges from the tree.
|
||||
<strong>Source in transcript:</strong> ~10:11–10:15, block 110</p>
|
||||
<hr />
|
||||
<h3 id="question-6">Question 6<a class="headerlink" href="#question-6" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 10:48 – 11:42
|
||||
<strong>Difficulty:</strong> Application</p>
|
||||
<p>A landscape manager in southern Georgia discovers EAB in local ash trees and plans a treatment schedule based on a single annual emergence. Based on Dr. Graziosi's presentation, what important consideration might this manager be overlooking?</p>
|
||||
<p>a) EAB only emerges every two years in all locations
|
||||
b) A portion of the local EAB population may require two years to develop, meaning adults could emerge in both years
|
||||
c) EAB does not complete its life cycle in southern climates
|
||||
d) EAB only feeds on ash trees in northern states</p>
|
||||
<p><strong>Correct Answer:</strong> b
|
||||
<strong>Explanation:</strong> Dr. Graziosi explained that while EAB is mostly a one-generation-per-year insect, there is always a portion of the population that requires two years to develop. This is more pronounced at northern latitudes but occurs in any location, and it is important to know when planning control.
|
||||
<strong>Source in transcript:</strong> ~10:48–11:42, blocks 116–124</p>
|
||||
<hr />
|
||||
<h3 id="question-7">Question 7<a class="headerlink" href="#question-7" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 13:02 – 13:46
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>According to the presentation, what was the single most important factor responsible for the rapid spread of the emerald ash borer across North America?</p>
|
||||
<p>a) Natural flight dispersal
|
||||
b) Nursery stock trade
|
||||
c) Movement of infested firewood
|
||||
d) Wind currents carrying adult beetles</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi identified firewood as the primary culprit, explaining that campers and travelers moved infested firewood, and researchers were able to connect the pattern of EAB spread closely with the highway and freeway system.
|
||||
<strong>Source in transcript:</strong> ~13:00–13:46, blocks 136–141</p>
|
||||
<hr />
|
||||
<h3 id="question-8">Question 8<a class="headerlink" href="#question-8" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 15:26 – 16:44
|
||||
<strong>Difficulty:</strong> Application</p>
|
||||
<p>An arborist inventorying trees in a Georgia neighborhood finds that all the ash trees have been killed by EAB but notices white fringetrees appear healthy. Based on Dr. Graziosi's presentation, should the arborist be concerned about EAB affecting the white fringetrees?</p>
|
||||
<p>a) No, because white fringetrees are not in the same plant family as ash
|
||||
b) No, because EAB only attacks ash species
|
||||
c) Yes, because white fringetree was discovered to be an alternate host for EAB and could serve as a population reservoir
|
||||
d) Yes, but only if the white fringetrees are under drought stress</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi explained that in 2014 it was discovered that EAB could expand its host range to attack white fringetree (same family, Oleaceae). More importantly, white fringetree can function as a reservoir for EAB populations even after all ash trees in an area are gone.
|
||||
<strong>Source in transcript:</strong> ~15:26–16:44, blocks 162–172</p>
|
||||
<hr />
|
||||
<h3 id="question-9">Question 9<a class="headerlink" href="#question-9" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 31:47 – 33:28
|
||||
<strong>Difficulty:</strong> Application</p>
|
||||
<p>A pest control operator inspects a crapemyrtle in December and finds both mature adult females and small mobile nymphs on the bark. Based on the presentation, is this finding unusual?</p>
|
||||
<p>a) Yes, all CMBS should be in a dormant stage during winter
|
||||
b) Yes, nymphs should only be present during summer months
|
||||
c) No, CMBS has overlapping generations, so multiple life stages can be present at any time of year
|
||||
d) No, but only adults should be present — the nymphs are likely a different insect</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi explained that CMBS can have up to five overlapping generations, meaning different stages of the insect can be found at any point. He showed a photo taken in Athens one month prior (winter) that contained both nymphs (crawlers) and adults.
|
||||
<strong>Source in transcript:</strong> ~33:10–33:47, blocks 327–329</p>
|
||||
<hr />
|
||||
<h3 id="question-10">Question 10<a class="headerlink" href="#question-10" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 36:42 – 37:17
|
||||
<strong>Difficulty:</strong> Analysis</p>
|
||||
<p>Dr. Graziosi discussed urban heat island effects in relation to crapemyrtle bark scale. Which of the following best explains why urban heat islands create a "double advantage" for scale insects?</p>
|
||||
<p>a) Heat kills natural enemies while attracting more scales to the area
|
||||
b) Heat increases tree growth rate, providing more food for scales
|
||||
c) Heat stresses the host tree, increasing its susceptibility, while simultaneously accelerating the insect's development
|
||||
d) Heat causes scales to produce more sooty mold, which protects them from predators</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi described two specific effects of urban heat islands: first, it stresses trees, making them more susceptible to pests; second, it accelerates the development of the insect itself. He noted that scales are particularly good at taking advantage of urban heat.
|
||||
<strong>Source in transcript:</strong> ~36:57–37:21, blocks 363–368</p>
|
||||
<hr />
|
||||
<h3 id="question-11">Question 11<a class="headerlink" href="#question-11" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 38:06 – 38:29
|
||||
<strong>Difficulty:</strong> Application</p>
|
||||
<p>A landscape company wants to use trunk injection of systemic insecticides to control a crapemyrtle bark scale infestation. Based on the presentation, what should they know?</p>
|
||||
<p>a) Trunk injection is the most effective method for CMBS control
|
||||
b) Trunk injection works but must be applied in fall
|
||||
c) Trunk injection is not a viable option because crapemyrtle absorbs systemic insecticides through the trunk very slowly
|
||||
d) Trunk injection is effective only on trees over 6 inches in diameter</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi specifically stated that chemical control of CMBS is complicated by the fact that crapemyrtle is not good at absorbing systemic insecticide through trunk injection, and that the chemical moves very slowly, making it not a viable option.
|
||||
<strong>Source in transcript:</strong> ~38:14–38:30, blocks 378–380</p>
|
||||
<hr />
|
||||
<h3 id="question-12">Question 12<a class="headerlink" href="#question-12" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 38:31 – 41:44
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>Which of the following is NOT one of the native predators Dr. Graziosi identified as feeding on crapemyrtle bark scale?</p>
|
||||
<p>a) Twice-stabbed lady beetle
|
||||
b) Green lacewing
|
||||
c) Bigeminal lady beetle
|
||||
d) Parasitoid wasp specialist from Asia</p>
|
||||
<p><strong>Correct Answer:</strong> d
|
||||
<strong>Explanation:</strong> Dr. Graziosi identified three lady beetle species (twice-stabbed, bigeminal, and Harlequin) and green lacewings (particularly the red-lipped green lacewing) as predators of CMBS in North America. He specifically noted that no effective parasitoid had yet been found for CMBS in the US, unlike the situation in Asia.
|
||||
<strong>Source in transcript:</strong> ~38:48–41:00, blocks 385–409</p>
|
||||
<hr />
|
||||
<h3 id="question-13">Question 13<a class="headerlink" href="#question-13" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 42:25 – 43:35
|
||||
<strong>Difficulty:</strong> Recall</p>
|
||||
<p>According to the presentation, the orange-striped oakworm moth primarily feeds on which group of trees?</p>
|
||||
<p>a) Ash species
|
||||
b) Crapemyrtles
|
||||
c) Red oaks, but also hickory, birch, and maple
|
||||
d) Pines and other conifers</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi described the orange-striped oakworm as a well-known pest of oaks, especially red oaks, but noted it can also feed on hickory, birch, and maple.
|
||||
<strong>Source in transcript:</strong> ~42:43–42:59, blocks 422–423</p>
|
||||
<hr />
|
||||
<h3 id="question-14">Question 14<a class="headerlink" href="#question-14" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 44:51 – 46:10
|
||||
<strong>Difficulty:</strong> Analysis</p>
|
||||
<p>Dr. Graziosi discussed Nuttall oaks on the UGA Athens campus as an example of vulnerability to the orange-striped oakworm. What underlying principle does this example illustrate about urban tree pest management?</p>
|
||||
<p>a) Nuttall oaks are a non-native species poorly adapted to Georgia
|
||||
b) Monoculture plantings of clonal nursery stock create genetically uniform populations where susceptibility in one tree means susceptibility in all
|
||||
c) Nuttall oaks are particularly attractive to oakworm moths due to their leaf chemistry
|
||||
d) Older trees are always more resistant to defoliating insects than younger ones</p>
|
||||
<p><strong>Correct Answer:</strong> b
|
||||
<strong>Explanation:</strong> Dr. Graziosi explained that urban trees often come from nurseries as clonal trees with very low genetic variability — "they are basically the same tree." Therefore the susceptibility of one tree reflects the susceptibility of all trees of that clone on campus, making them uniformly vulnerable.
|
||||
<strong>Source in transcript:</strong> ~45:00–46:05, blocks 452–460</p>
|
||||
<hr />
|
||||
<h3 id="question-15">Question 15<a class="headerlink" href="#question-15" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Timestamp Reference:</strong> 47:56 – 49:05
|
||||
<strong>Difficulty:</strong> Application</p>
|
||||
<p>A homeowner calls about an oak tree losing leaves in late September to orange-striped oakworm caterpillars. About 30% of the canopy has been defoliated. Based on Dr. Graziosi's decision framework, what is the most appropriate recommendation?</p>
|
||||
<p>a) Immediately apply a broad-spectrum systemic insecticide via soil drench
|
||||
b) Apply Btk foliar spray urgently before the tree dies
|
||||
c) Consider that late-season defoliation is less harmful because the tree has already stored nutrients, and monitor rather than treat aggressively
|
||||
d) Remove and replace the tree, as 30% defoliation is always fatal</p>
|
||||
<p><strong>Correct Answer:</strong> c
|
||||
<strong>Explanation:</strong> Dr. Graziosi outlined two key considerations: the 25% defoliation threshold distinguishes aesthetic from actual damage, and late-season defoliation (even if substantial) is less harmful because the tree has already stored its nutrients. A mature oak at 30% defoliation in late September, while above the threshold, benefits from the seasonal timing, suggesting monitoring may be more appropriate than aggressive chemical intervention.
|
||||
<strong>Source in transcript:</strong> ~48:05–48:44, blocks 482–486</p>
|
||||
<hr />
|
||||
<h2 id="verification-checklist">Verification Checklist<a class="headerlink" href="#verification-checklist" title="Permanent link">¶</a></h2>
|
||||
<ul>
|
||||
<li>[x] All 15 questions derived exclusively from presentation content</li>
|
||||
<li>[x] Timestamp references verified against corrected transcript</li>
|
||||
<li>[x] No external knowledge required to answer correctly</li>
|
||||
<li>[x] Difficulty distribution: 6 Recall / 6 Application / 3 Analysis</li>
|
||||
<li>[x] Coverage spans early (disease triangle), middle (EAB, CMBS), and late (oakworm) content</li>
|
||||
<li>[x] Answer keys unambiguous based on speaker's statements</li>
|
||||
<li>[x] Distractors plausible but clearly incorrect per presentation</li>
|
||||
<li>[x] No "all of the above" or "none of the above" options used</li>
|
||||
</ul>
|
||||
|
||||
|
||||
|
||||
|
||||
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|
||||
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|
||||
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||||
|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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Dr. Ignazio Graziosi — January 15, 2026
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Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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Dr. Ignazio Graziosi — January 15, 2026
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|
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|
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|
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||||
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|
||||
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||||
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|
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||||
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||||
|
||||
<h1 id="review-prompts-graziosi-tree-pests">Review Prompts — Graziosi, Tree Pests<a class="headerlink" href="#review-prompts-graziosi-tree-pests" title="Permanent link">¶</a></h1>
|
||||
<blockquote>
|
||||
<p><strong>Placeholder</strong> — Paste your Stage 4 pipeline output here.</p>
|
||||
</blockquote>
|
||||
<h1 id="gtbop-moodle-review-prompts">GTBOP Moodle Review Prompts<a class="headerlink" href="#gtbop-moodle-review-prompts" title="Permanent link">¶</a></h1>
|
||||
<h2 id="understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies">Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies<a class="headerlink" href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" title="Permanent link">¶</a></h2>
|
||||
<h3 id="dr-ignazio-graziosi-january-15-2026">Dr. Ignazio Graziosi — January 15, 2026<a class="headerlink" href="#dr-ignazio-graziosi-january-15-2026" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Source:</strong> Corrected SRT transcript (Stage 1) + Archive Package (Stage 2)
|
||||
<strong>Prompts:</strong> 6 timestamp-linked review tasks</p>
|
||||
<p>These short review tasks structure self-paced viewing by directing students to specific video segments and asking them to identify key points.</p>
|
||||
<hr />
|
||||
<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
|
||||
<h3 id="review-task-1">Review Task 1<a class="headerlink" href="#review-task-1" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Watch:</strong> 1:28 – 6:06
|
||||
<strong>Task:</strong> Identify the three components of the disease triangle and the three levels of the spiral of tree decline. For each spiral level, list one example factor that Dr. Graziosi names.
|
||||
<strong>Key Points to Identify:</strong>
|
||||
- Disease triangle: pest, host tree, environment
|
||||
- Predisposing factors (e.g., soil compaction, urban environment, genetic potential)
|
||||
- Inciting factors (e.g., defoliating insects, drought)
|
||||
- Contributing factors (e.g., wood-boring insects, nematodes, Armillaria)</p>
|
||||
<hr />
|
||||
<h3 id="review-task-2">Review Task 2<a class="headerlink" href="#review-task-2" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Watch:</strong> 8:23 – 10:47
|
||||
<strong>Task:</strong> Follow Dr. Graziosi's description of the emerald ash borer life cycle. List the diagnostic signs he describes for identifying an EAB-infested tree, and note the typical generation time.
|
||||
<strong>Key Points to Identify:</strong>
|
||||
- Larval galleries under bark disrupting phloem, cambium, and outer xylem
|
||||
- Water sprouts as a diagnostic feature
|
||||
- D-shaped exit holes from adult emergence
|
||||
- Primarily one generation per year, but a portion of the population takes two years</p>
|
||||
<hr />
|
||||
<h3 id="review-task-3">Review Task 3<a class="headerlink" href="#review-task-3" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Watch:</strong> 18:20 – 21:31
|
||||
<strong>Task:</strong> Dr. Graziosi presents the invasion curve diagram. Describe how pest prevalence changes over time and explain why early detection matters for control options and cost.
|
||||
<strong>Key Points to Identify:</strong>
|
||||
- Introduction → low prevalence → exponential growth → carrying capacity (plateau)
|
||||
- Early: eradication may be possible; prevention effective
|
||||
- Late: only local control (individual tree protection); costs increase dramatically
|
||||
- Land managers become aware before the general public</p>
|
||||
<hr />
|
||||
<h3 id="review-task-4">Review Task 4<a class="headerlink" href="#review-task-4" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Watch:</strong> 23:57 – 28:00
|
||||
<strong>Task:</strong> Describe the importation biological control program for EAB. Identify the three parasitoid wasp species' targets (what life stage each attacks) and explain why being specialists is an advantage.
|
||||
<strong>Key Points to Identify:</strong>
|
||||
- Two wasp species attack EAB larvae under bark (one uses vibrational cues and ovipositor to drill through bark)
|
||||
- One wasp species attacks EAB eggs
|
||||
- Specialists only attack EAB — won't waste their potential on other insects
|
||||
- Release technology: parasitized logs hung on trees; egg parasitoid released via small container ("O-binator")</p>
|
||||
<hr />
|
||||
<h3 id="review-task-5">Review Task 5<a class="headerlink" href="#review-task-5" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Watch:</strong> 29:42 – 38:30
|
||||
<strong>Task:</strong> Compare crapemyrtle bark scale to the emerald ash borer in terms of: (a) host specificity, (b) available biological control, and (c) effectiveness of trunk injection. Note specific differences Dr. Graziosi highlights.
|
||||
<strong>Key Points to Identify:</strong>
|
||||
- CMBS is a generalist (feeds on apple, soybean, fig, beautyberry, St. John's wort in addition to crapemyrtle); EAB is more host-specific (ash + white fringetree)
|
||||
- No effective specialist parasitoid found for CMBS in the US; EAB has imported specialist parasitoids
|
||||
- Trunk injection not viable for CMBS (crapemyrtle absorbs poorly); trunk injection is a viable option for EAB in ash</p>
|
||||
<hr />
|
||||
<h3 id="review-task-6">Review Task 6<a class="headerlink" href="#review-task-6" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Watch:</strong> 42:25 – 49:19
|
||||
<strong>Task:</strong> Explain Dr. Graziosi's two-part decision framework for determining whether to treat orange-striped oakworm. Then describe why clonal urban plantings are particularly vulnerable to this native pest.
|
||||
<strong>Key Points to Identify:</strong>
|
||||
- Part 1: Distinguish aesthetic vs. actual damage — threshold is ~25% defoliation
|
||||
- Part 2: Assess season — late-season defoliation less harmful (tree already stored nutrients)
|
||||
- Clonal nursery stock = low genetic variability = uniform susceptibility across all trees of the same clone
|
||||
- Urban heat island compounds the problem by accelerating insect development</p>
|
||||
<hr />
|
||||
<h2 id="verification-checklist">Verification Checklist<a class="headerlink" href="#verification-checklist" title="Permanent link">¶</a></h2>
|
||||
<ul>
|
||||
<li>[x] All review tasks reference specific, verifiable video segments</li>
|
||||
<li>[x] Key points match content actually presented in those segments</li>
|
||||
<li>[x] No external knowledge needed to complete tasks</li>
|
||||
<li>[x] Tasks progress through the full presentation (early → middle → late)</li>
|
||||
</ul>
|
||||
|
||||
|
||||
|
||||
|
||||
@@ -78,7 +78,7 @@
|
||||
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|
||||
|
||||
|
||||
<a href="#archive-summary-graziosi-tree-pests" class="md-skip">
|
||||
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|
||||
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|
||||
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|
||||
|
||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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|
||||
|
||||
|
||||
Archive Summary
|
||||
|
||||
|
||||
|
||||
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|
||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
|
||||
Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
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|
||||
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|
||||
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||||
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NARRATIVE SUMMARY
|
||||
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YOUTUBE TIMESTAMPS
|
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QUESTIONS & ANSWERS
|
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|
||||
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||||
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|
||||
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|
||||
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|
||||
|
||||
ADDITIONAL RESOURCES
|
||||
|
||||
</span>
|
||||
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|
||||
|
||||
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||||
|
||||
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|
||||
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|
||||
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||||
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|
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|
||||
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|
||||
|
||||
Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
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|
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NARRATIVE SUMMARY
|
||||
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|
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YOUTUBE TIMESTAMPS
|
||||
|
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|
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|
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|
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QUESTIONS & ANSWERS
|
||||
|
||||
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|
||||
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|
||||
|
||||
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||||
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|
||||
<a href="#additional-resources" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
ADDITIONAL RESOURCES
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
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|
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||||
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|
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|
||||
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|
||||
@@ -2554,10 +2709,86 @@
|
||||
|
||||
|
||||
|
||||
<h1 id="archive-summary-graziosi-tree-pests">Archive Summary — Graziosi, Tree Pests<a class="headerlink" href="#archive-summary-graziosi-tree-pests" title="Permanent link">¶</a></h1>
|
||||
<blockquote>
|
||||
<p><strong>Placeholder</strong> — Paste your Stage 2 pipeline output here.</p>
|
||||
</blockquote>
|
||||
<h1 id="gtbop-webinar-archive-summary">GTBOP Webinar Archive Summary<a class="headerlink" href="#gtbop-webinar-archive-summary" title="Permanent link">¶</a></h1>
|
||||
<h2 id="understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies">Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies<a class="headerlink" href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" title="Permanent link">¶</a></h2>
|
||||
<p><strong>Webinar Date:</strong> January 15, 2026
|
||||
<strong>Speaker:</strong> Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
<strong>Moderator:</strong> Dr. Bodie Pennisi, UGA Horticulturist
|
||||
<strong>Duration:</strong> 52:11
|
||||
<strong>Series:</strong> Green & Commercial
|
||||
<strong>CEU Categories:</strong> TBD</p>
|
||||
<hr />
|
||||
<h2 id="narrative-summary">NARRATIVE SUMMARY<a class="headerlink" href="#narrative-summary" title="Permanent link">¶</a></h2>
|
||||
<p>Dr. Ignazio Graziosi, an assistant professor in the Warnell School of Forestry and Natural Resources at the University of Georgia, presented a framework for understanding tree pest damage through ecological interactions. He emphasized that damage results from the interplay of three components — the pest, the host tree, and the environment — known as the disease triangle. He extended this concept through the spiral of tree decline, illustrating how predisposing factors like soil compaction, inciting factors like drought, and contributing factors including wood-boring insects and fungi push trees toward death, particularly in urban environments.</p>
|
||||
<p>Dr. Graziosi applied this framework to three case studies. The first examined the emerald ash borer (EAB), a non-native pest devastating native ash across North America. He reviewed the EAB life cycle, the role of firewood movement in spreading the invasion, and the diversity of ash species at risk in Georgia, including the white fringetree (family Oleaceae) as an alternate host and population reservoir. He explained how EAB populations remain low in Asia due to co-evolved resistant trees and specialist parasitoid wasps, which USDA has introduced to North America through importation biological control. Chemical protection via tree injection, bark spray, and soil drench remains critical for high-value landscape trees.</p>
|
||||
<p>The second case study addressed crapemyrtle bark scale (CMBS), a non-native pest attacking crapemyrtle (<em>Lagerstroemia indica</em>) across the South. Dr. Graziosi described overlapping generations that complicate control timing, an expanding host range including American beautyberry and St. John's wort, and urban heat island effects that stress trees while accelerating insect development. Chemical options include soil drench, soil injection, and foliar sprays, though trunk injection is ineffective in crapemyrtle. Native predators such as lady beetles and green lacewings provide some control but lack the specialization needed for sustained suppression.</p>
|
||||
<p>The third case study examined the orange-striped oakworm moth, a native pest of native oaks. Dr. Graziosi explained why clonal nursery stock in urban landscapes creates genetically uniform stands with low resistance, compounded by urban heat effects. He outlined a practical decision framework: managers should distinguish aesthetic damage from actual harm using a 25% defoliation threshold and recognize that late-season defoliation is less damaging. Btk (<em>Bacillus thuringiensis</em> kurstaki) as a foliar spray is effective against young larvae with minimal impact on natural enemies.</p>
|
||||
<hr />
|
||||
<h2 id="youtube-timestamps">YOUTUBE TIMESTAMPS<a class="headerlink" href="#youtube-timestamps" title="Permanent link">¶</a></h2>
|
||||
<p>0:00 Introduction and speaker credentials
|
||||
1:28 The disease triangle: pest, tree, and environment
|
||||
3:02 The spiral of tree decline
|
||||
6:07 Native vs. non-native pest and tree interactions
|
||||
7:22 Example 1: Emerald ash borer (EAB) — overview
|
||||
8:23 EAB life cycle and damage symptoms
|
||||
10:48 EAB generation time and temperature effects
|
||||
11:57 EAB spread across North America and firewood
|
||||
13:47 EAB in Georgia and native ash species diversity
|
||||
15:26 White fringetree as alternate EAB host
|
||||
16:43 Global trade and non-native species introductions
|
||||
18:20 The invasion curve: detection, eradication, and control
|
||||
21:32 Why EAB is not a pest in Asia
|
||||
22:34 Chemical control methods for EAB
|
||||
23:57 Importation biological control: parasitoid wasps
|
||||
28:01 Native natural enemies and the goal of balance
|
||||
29:42 Example 2: Crapemyrtle bark scale (CMBS) — overview
|
||||
31:47 CMBS biology, life cycle, and overlapping generations
|
||||
33:47 CMBS invasion timeline and early detection
|
||||
35:02 CMBS and the invasion curve in Georgia
|
||||
36:06 CMBS host range expansion in North America
|
||||
36:42 Urban heat island effects on scales
|
||||
37:28 Chemical control options for CMBS
|
||||
38:31 Natural enemies: lady beetles and lacewings
|
||||
42:04 Balancing chemical and biological control for CMBS
|
||||
42:25 Example 3: Orange-striped oakworm moth — overview
|
||||
43:53 Oakworm life cycle and seasonal timing
|
||||
44:51 Why urban and clonal trees are vulnerable
|
||||
46:35 Natural enemies of the oakworm
|
||||
47:56 Control decisions: damage thresholds and Btk
|
||||
49:19 Presentation wrap-up and key takeaways
|
||||
50:01 Moderator comments on CMBS expansion in Georgia</p>
|
||||
<hr />
|
||||
<h2 id="questions-answers">QUESTIONS & ANSWERS<a class="headerlink" href="#questions-answers" title="Permanent link">¶</a></h2>
|
||||
<p><strong>Q: What is the disease triangle, and why is it important for understanding tree pest damage?</strong>
|
||||
A: The disease triangle describes how damage to a tree results from the interaction of three components: the pest, the host tree, and the environment. Damage is not caused by the pest alone — a susceptible tree in a stressful environment amplifies the impact. Dr. Graziosi emphasized that this framework helps professionals identify which factors they can influence when managing pest problems, particularly in urban settings where environmental stress is high.</p>
|
||||
<p><strong>Q: What is the spiral of tree decline, and how does it relate to tree death in urban environments?</strong>
|
||||
A: The spiral of tree decline is a diagram with three levels of stressors — predisposing factors (such as soil compaction and genetic potential), inciting factors (such as defoliating insects and drought), and contributing factors (such as wood-boring insects, nematodes, and Armillaria). Each level can independently bring a tree to death, and urban environments intensify these stressors. The key takeaway is that tree death typically results from multiple interacting factors rather than a single cause.</p>
|
||||
<p><strong>Q: How does firewood movement contribute to the spread of the emerald ash borer?</strong>
|
||||
A: The movement of infested firewood by campers and travelers was the primary pathway for EAB's rapid spread across North America. Researchers were able to connect the pattern of EAB spread closely with the highway and freeway system. This led to the "Don't Move Firewood" campaign, which also helps contain other invasive insects such as the Asian longhorned beetle.</p>
|
||||
<p><strong>Q: Why is the emerald ash borer not considered a pest in its native range in Asia?</strong>
|
||||
A: Two main reasons explain this. First, native Asian ash species co-evolved with the EAB and are resistant or less susceptible — only very weak, stressed trees are attacked there. Second, a community of specialist natural enemies, including parasitoid wasps, keeps EAB populations low in Asia. This understanding directly informed both the chemical protection approach (making North American trees artificially resistant) and the importation biological control program.</p>
|
||||
<p><strong>Q: What are the chemical control options for protecting ash trees from the emerald ash borer?</strong>
|
||||
A: Three main application methods are available: tree injection, bark spray, and soil drench. Some products can be applied by homeowners while others require a professional applicator. Timing is important — for example, soil drench needs to be applied in spring before leaves emerge. Dr. Graziosi noted that chemical protection remains critical for saving individual high-value trees, since biological control has not yet been fully successful for EAB in North America.</p>
|
||||
<p><strong>Q: Why is trunk injection not effective for controlling crapemyrtle bark scale?</strong>
|
||||
A: Crapemyrtle does not absorb systemic insecticides well through trunk injection — the chemical moves very slowly through the plant, making it an ineffective delivery method. Instead, soil drench, soil injection, and foliar sprays are the recommended chemical control approaches for CMBS. Soaps can also be used to target crawlers, the young mobile nymphs.</p>
|
||||
<p><strong>Q: What native predators help control crapemyrtle bark scale, and what are their limitations?</strong>
|
||||
A: Three lady beetle species — the twice-stabbed lady beetle, the bigeminal lady beetle, and the non-native Harlequin lady beetle — are active predators of CMBS, feeding on both nymphs and adults. Green lacewings, particularly the red-lipped green lacewing, also prey on CMBS nymphs and eggs and are commercially available. However, these predators are generalists that often arrive late in the season and do not build sustained populations on infested trees, limiting their effectiveness as standalone control agents.</p>
|
||||
<p><strong>Q: How should a landscape professional decide whether to treat for orange-striped oakworm?</strong>
|
||||
A: Dr. Graziosi outlined a two-part decision framework. First, distinguish between aesthetic damage and actual harm to the tree — the threshold is approximately 25% defoliation. Second, assess the season: late-season defoliation, even if substantial, is less harmful because the tree has already stored its nutrients. Treatment is most warranted for young or small trees experiencing significant early-season defoliation.</p>
|
||||
<p><strong>Q: Why are urban landscape trees particularly vulnerable to the orange-striped oakworm?</strong>
|
||||
A: Urban landscape trees are often clonal nursery stock with very low genetic variability. Dr. Graziosi used the example of Nuttall oaks on the UGA Athens campus — beautiful, high-quality trees that are essentially genetically identical, meaning the susceptibility of one tree is the susceptibility of all. Combined with urban heat island effects that accelerate insect development, this creates conditions favoring pest outbreaks.</p>
|
||||
<p><strong>Q: What is importation biological control, and how has it been applied to the emerald ash borer?</strong>
|
||||
A: Importation biological control involves studying the natural enemies that effectively control a pest in its native range and introducing them to the invaded region. USDA conducted risk assessments and introduced three specialist parasitoid wasp species from Asia to target EAB. Two species attack EAB larvae under the bark using ovipositors to locate them through vibrational cues, while the third parasitizes EAB eggs. These wasps are specialists that only attack EAB, ensuring they won't harm other insects.</p>
|
||||
<p><strong>Q: What is the significance of the white fringetree for emerald ash borer management in Georgia?</strong>
|
||||
A: The white fringetree, which belongs to the same family (Oleaceae) as ash, was discovered in 2014 to be an alternate host for the EAB. This is significant not only because it means another native plant species is at risk, but more importantly because white fringetree can serve as a population reservoir, allowing EAB to persist in an area even after all ash trees are gone. This has direct implications for long-term management strategies in Georgia.</p>
|
||||
<hr />
|
||||
<h2 id="additional-resources">ADDITIONAL RESOURCES<a class="headerlink" href="#additional-resources" title="Permanent link">¶</a></h2>
|
||||
<ul>
|
||||
<li>Dr. Graziosi referenced QR codes linking to UGA publications on EAB status and control in Georgia, the full insecticide protocol for EAB, and CMBS biology and management.</li>
|
||||
<li>The iTree tool suite (mentioned for calculating ecosystem services and benefits of trees, and for right-tree-right-place selection) is available at itreetools.org.</li>
|
||||
<li>Sign-in sheets for CEU credit should be submitted to gtbop@uga.edu or mailed to the address on the sign-in sheet.</li>
|
||||
<li>The next GTBOP webinar was announced for March 2026.</li>
|
||||
</ul>
|
||||
<hr />
|
||||
<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
|
||||
|
||||
|
||||
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|
||||
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|
||||
|
||||
|
||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
|
||||
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|
||||
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||||
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||||
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||||
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||||
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File: Tree Pests in the Landscape — Dr. Ignazio Graziosi
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Emerald Ash Borer — Name Corrections (extensive)
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Crapemyrtle Bark Scale — Name Corrections
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|
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|
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|
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|
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|
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File: Tree Pests in the Landscape — Dr. Ignazio Graziosi
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|
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Emerald Ash Borer — Name Corrections (extensive)
|
||||
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||||
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|
||||
|
||||
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||||
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||||
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|
||||
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||||
|
||||
Crapemyrtle Bark Scale — Name Corrections
|
||||
|
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|
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||||
|
||||
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||||
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||||
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||||
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|
||||
|
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||||
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|
||||
|
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|
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|
||||
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||||
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|
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Technical Terms — Tree Biology
|
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|
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|
||||
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||||
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||||
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||||
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|
||||
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|
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||||
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|
||||
|
||||
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|
||||
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|
||||
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||||
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|
||||
|
||||
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|
||||
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|
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|
||||
|
||||
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|
||||
|
||||
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|
||||
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|
||||
|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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||||
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|
||||
|
||||
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|
||||
|
||||
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|
||||
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|
||||
|
||||
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||||
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|
||||
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|
||||
|
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|
||||
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|
||||
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|
||||
|
||||
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|
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|
||||
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|
||||
|
||||
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|
||||
|
||||
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|
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|
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|
||||
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@@ -2554,12 +2941,252 @@
|
||||
|
||||
|
||||
|
||||
<h1 id="transcript-corrections-graziosi-tree-pests">Transcript Corrections — Graziosi, Tree Pests<a class="headerlink" href="#transcript-corrections-graziosi-tree-pests" title="Permanent link">¶</a></h1>
|
||||
<blockquote>
|
||||
<p><strong>Placeholder</strong> — Paste your Stage 1 pipeline output here.</p>
|
||||
</blockquote>
|
||||
<h1 id="srt-transcript-correction-summary">SRT Transcript Correction Summary<a class="headerlink" href="#srt-transcript-correction-summary" title="Permanent link">¶</a></h1>
|
||||
<h2 id="file-tree-pests-in-the-landscape-dr-ignazio-graziosi">File: Tree Pests in the Landscape — Dr. Ignazio Graziosi<a class="headerlink" href="#file-tree-pests-in-the-landscape-dr-ignazio-graziosi" title="Permanent link">¶</a></h2>
|
||||
<p><strong>Date Corrected:</strong> February 8, 2026
|
||||
<strong>Webinar Date:</strong> January 15, 2026
|
||||
<strong>Series:</strong> Green & Commercial
|
||||
<strong>Topic:</strong> Entomology / Tree Health / Urban Forestry
|
||||
<strong>Speaker:</strong> Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
<strong>Moderator:</strong> Dr. Bodie Pennisi, UGA Horticulturist
|
||||
<strong>Closing:</strong> Rich Braman</p>
|
||||
<hr />
|
||||
<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
|
||||
<h2 id="source-verification">SOURCE VERIFICATION<a class="headerlink" href="#source-verification" title="Permanent link">¶</a></h2>
|
||||
<ul>
|
||||
<li><strong>Original blocks:</strong> 529</li>
|
||||
<li><strong>Corrected blocks:</strong> 529 ✓ MATCH CONFIRMED</li>
|
||||
<li><strong>Time range:</strong> 00:00:01,100 to 00:52:11,580</li>
|
||||
<li><strong>Runtime:</strong> ~52 minutes</li>
|
||||
<li><strong>File reading:</strong> COMPLETE ✓</li>
|
||||
<li><strong>Coverage proof:</strong></li>
|
||||
<li>Early [~2:28]: Disease triangle concept — pest, tree, and environment interaction causes damage</li>
|
||||
<li>Middle [~24:03]: Importation biological control for EAB — parasitoid wasps brought from Asia to North America</li>
|
||||
<li>Late [~48:46]: Btk (Bacillus thuringiensis kurstaki) as foliar spray for orange-striped oakworm control; 25% defoliation threshold</li>
|
||||
</ul>
|
||||
<hr />
|
||||
<h2 id="corrections-applied">Corrections Applied<a class="headerlink" href="#corrections-applied" title="Permanent link">¶</a></h2>
|
||||
<h3 id="proper-nouns-speaker-names">Proper Nouns — Speaker Names<a class="headerlink" href="#proper-nouns-speaker-names" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"Ignacio" → "Ignazio" (Blocks 2, 503)</li>
|
||||
<li>"Bori" → "Bodie" (Blocks 15, 62)</li>
|
||||
<li>"body" → "Bodie" (Block 502)</li>
|
||||
<li>"Bodhi" → "Bodie" (Block 526)</li>
|
||||
<li>"buddy" → "Bodie" (Block 519 — Graziosi farewell to Pennisi)</li>
|
||||
</ul>
|
||||
<h3 id="emerald-ash-borer-name-corrections-extensive">Emerald Ash Borer — Name Corrections (extensive)<a class="headerlink" href="#emerald-ash-borer-name-corrections-extensive" title="Permanent link">¶</a></h3>
|
||||
<p>Whisper produced dozens of garbled variants of "emerald ash borer" and its abbreviation "EAB" throughout the transcript. All were corrected to the standard forms:</p>
|
||||
<p><strong>Full name variants corrected → "emerald ash borer":</strong>
|
||||
- "emeralish borer" (Blocks 84, 85)
|
||||
- "emeralash borer" (Blocks 87, 88)
|
||||
- "gemaralash borer" (Block 100)
|
||||
- "Emmerlash border" (Blocks 123, 124)
|
||||
- "emeralosh borer" (Block 91)
|
||||
- "Yemalash Bor" (Block 146)
|
||||
- "Ammonash war" (Block 150)
|
||||
- "MLA-Scheish border" (Block 163)
|
||||
- "Amaralash border" (Block 220)</p>
|
||||
<p><strong>Abbreviation variants corrected → "EAB":</strong>
|
||||
- "EAD" (Block 91)
|
||||
- "IAB" (Blocks 278, 280, 281)
|
||||
- "AAB" (Blocks 170, 171, 172, 173)
|
||||
- "EEA-B" (Block 229)
|
||||
- "AB" (Block 297)
|
||||
- "AEB" (Blocks 185, 186)
|
||||
- "yebby" / "yebe" / "yee-be" / "yeb" / "yebis" (Blocks 188, 193, 243, 254, 257, 263, 265, 266, 269, 270)
|
||||
- "the baby" (Block 243 — context: "the EAB there")
|
||||
- "the bee" (Block 264 — context: parasitoid drilling into bark)
|
||||
- "YB" (Block 170)</p>
|
||||
<p><strong>Total EAB-related corrections: ~45+ individual instances</strong></p>
|
||||
<h3 id="crapemyrtle-bark-scale-name-corrections">Crapemyrtle Bark Scale — Name Corrections<a class="headerlink" href="#crapemyrtle-bark-scale-name-corrections" title="Permanent link">¶</a></h3>
|
||||
<p>All variants standardized to "crapemyrtle bark scale" (one word, no hyphen per extension convention):
|
||||
- "crepe-mirtle bark scale" → "crapemyrtle bark scale" (multiple blocks)
|
||||
- "crepe-myrtle bark scale" → "crapemyrtle bark scale"
|
||||
- "crepe myrtle bark scale" → "crapemyrtle bark scale"
|
||||
- "crepe-mirtle bar scale" → "crapemyrtle bark scale"
|
||||
- "crepe myrtle bar scale" → "crapemyrtle bark scale"
|
||||
- "crab myrtle basket" → "crapemyrtle bark scale" (Block 337)
|
||||
- "capemir" → "crapemyrtle" (Block 404)
|
||||
- "bar scale" → "bark scale" (Blocks 334, 405)
|
||||
- All standalone "crepe myrtle" / "crepe-myrtle" / "crepe-mirtle" → "crapemyrtle"</p>
|
||||
<h3 id="scientific-names">Scientific Names<a class="headerlink" href="#scientific-names" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"Lagerstrenia indica" → "<em>Lagerstroemia indica</em>" (Block 304)</li>
|
||||
<li>"La Grestorhemia speciosa" → "<em>Lagerstroemia speciosa</em>" (Block 353)</li>
|
||||
<li>"armillaria" → "Armillaria" (Block 57 — genus capitalized)</li>
|
||||
<li>"oleese" → "Oleaceae" (Block 165)</li>
|
||||
</ul>
|
||||
<h3 id="technical-terms-entomology">Technical Terms — Entomology<a class="headerlink" href="#technical-terms-entomology" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"four-inch star" → "fourth instar" (Block 102)</li>
|
||||
<li>"pre-culture" → "prepupa" (Block 107)</li>
|
||||
<li>"ovopositor" → "ovipositor" (Block 264, 2 instances)</li>
|
||||
<li>"T's tail … T's ovipositor" → "Its tail … its ovipositor" (Block 264)</li>
|
||||
<li>"BDK, Bacillus thuringiensis, Crustacea" → "Btk, Bacillus thuringiensis kurstaki" (Blocks 488–489)</li>
|
||||
<li>"inseticides" → "insecticides" (Block 231)</li>
|
||||
<li>"twice-tapped" → "twice-stabbed" (Block 392)</li>
|
||||
<li>"ladybeadle" → "lady beetle" (Blocks 393, 394, multiple instances)</li>
|
||||
<li>"Geminal" / "begeminal" → "bigeminal" (Blocks 392, 393)</li>
|
||||
<li>"infuriate the biological control" → "interfere with the biological control" (Block 415)</li>
|
||||
<li>"incident" → "insect" (Block 327 — "stages of the insect")</li>
|
||||
</ul>
|
||||
<h3 id="technical-terms-tree-biology">Technical Terms — Tree Biology<a class="headerlink" href="#technical-terms-tree-biology" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"the camium, the artoxylem" → "the cambium, the outer xylem" (Block 92)</li>
|
||||
<li>"are incapacity" → "carrying capacity" (Block 207)</li>
|
||||
<li>"interesting trace" → "interesting tree" (Block 155 — about blue ash)</li>
|
||||
</ul>
|
||||
<h3 id="species-names">Species Names<a class="headerlink" href="#species-names" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"orange-type wormoth" → "orange-striped oakworm moth" (Blocks 461, 464)</li>
|
||||
<li>"orange-type oak wormoth" → "orange-striped oakworm moth" (Block 421 was correct; Block 461 corrected)</li>
|
||||
<li>"orange stripe, / awkward mouth" → "orange-striped / oakworm moth" (Blocks 474–475)</li>
|
||||
<li>"natal oaks" → "Nuttall oaks" (Block 456)</li>
|
||||
<li>"Nuttal oak" → "Nuttall oak" (Block 460)</li>
|
||||
<li>"white fring tree" → "white fringetree" (Blocks 165, 357)</li>
|
||||
<li>"white fringe tree" → "white fringetree" (Blocks 168, 169, 172)</li>
|
||||
<li>"four webworm" → "fall webworm" (Block 29)</li>
|
||||
</ul>
|
||||
<h3 id="pest-names-other">Pest Names / Other<a class="headerlink" href="#pest-names-other" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"also can't send John's work" → "also on St. John's wort" (Block 358)</li>
|
||||
<li>"in the festive fire" → "infested firewood" (Block 137)</li>
|
||||
<li>"non-80 species" → "non-native species" (Block 181)</li>
|
||||
<li>"expansion of the past" → "expansion of the pest" (Block 506)</li>
|
||||
<li>"contain the incident to quarantine" → "contain the insect through quarantine" (Block 130)</li>
|
||||
</ul>
|
||||
<h3 id="grammar-transcription-cleanup">Grammar / Transcription Cleanup<a class="headerlink" href="#grammar-transcription-cleanup" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>"invasive invasive species" → "invasive species" (Block 5 — Whisper doubled word)</li>
|
||||
<li>"those past" → "those pests" (Block 76)</li>
|
||||
<li>"different tests" → "different pests" (Block 77)</li>
|
||||
<li>"This is the map, is the trap" → "This is the trap" (Block 186)</li>
|
||||
</ul>
|
||||
<hr />
|
||||
<h2 id="flagged-for-verification">Flagged for Verification<a class="headerlink" href="#flagged-for-verification" title="Permanent link">¶</a></h2>
|
||||
<ul>
|
||||
<li>
|
||||
<p><strong>Block 45:</strong> [VERIFY: "Dr. Klein"] — Speaker references "Dr. Klein" as the previous presenter on the webinar. Confirm name against webinar program for January 15, 2026.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 161:</strong> [VERIFY: "swamp white and small ash"] — Speaker lists Georgia ash species. "Swamp white ash" is not a standard species name. "Small ash" may refer to <em>Fraxinus smallii</em> (Small's ash). Verify species list against audio.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 176:</strong> [VERIFY: "this not accidental introduction"] — Meaning is likely "this accidental introduction" (EAB was accidentally introduced via trade). Whisper may have misplaced "not" from later in the sentence. Verify against audio.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 277:</strong> [VERIFY: "the O-binator"] — Name of egg parasitoid release device. Possibly "Oobinator" (a play on <em>Oobius agrili</em>, the egg parasitoid). Verify device name against audio and USDA-ARS biocontrol literature.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 392–393:</strong> [VERIFY: "bigeminal lady beetle"] — Corrected from "begeminal" / "Geminal ladybeadle." Likely refers to <em>Hyperaspis bigeminata</em>, a documented predator of crapemyrtle bark scale. Confirm species name against audio.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 473–474:</strong> [VERIFY: "pinnacle leaf"] — Speaker describes underside of a leaf with oakworm eggs. "Pinnacle" is not a standard botanical term. Possibly "pin oak leaf" spoken with Italian accent. Verify against audio.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 511:</strong> [VERIFY: "the planet"] — Bodie Pennisi says "all across the areas around the planet." Context suggests she may have said "the plantings" (discussing CMBS in Savannah plantings). Verify against audio.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Block 528:</strong> [VERIFY: "buddy"] — Rich Braman says "I'll see you soon, buddy." Could be the word "buddy" or a misheard "Bodie." Left as-is pending audio verification.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p><strong>Blocks 13–14:</strong> [VERIFY: "education and analysis. / outreach."] — These blocks have overlapping timestamps (13 ends at 01:01.380, 14 starts at 01:00.920). Block 13's "analysis" may actually be "outreach" (matching block 14). Verify against audio.</p>
|
||||
</li>
|
||||
</ul>
|
||||
<hr />
|
||||
<h2 id="srt-format-compliance">SRT Format Compliance<a class="headerlink" href="#srt-format-compliance" title="Permanent link">¶</a></h2>
|
||||
<p>✅ All timestamps preserved exactly as original
|
||||
✅ All sequence numbers maintained (1–529)
|
||||
✅ Blank lines between segments preserved
|
||||
✅ Maximum 2 lines per subtitle segment maintained
|
||||
✅ No segments merged or split
|
||||
✅ Block count: 529 original = 529 corrected ✓</p>
|
||||
<hr />
|
||||
<h2 id="new-patterns-for-common-corrections-reference">New Patterns for Common Corrections Reference<a class="headerlink" href="#new-patterns-for-common-corrections-reference" title="Permanent link">¶</a></h2>
|
||||
<p>The following Whisper error patterns are new to this webinar and should be added to the project reference:</p>
|
||||
<table>
|
||||
<thead>
|
||||
<tr>
|
||||
<th>Whisper Output</th>
|
||||
<th>Correct Form</th>
|
||||
<th>Context</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>emeralish/emeralash/gemaralash/Emmerlash/emeralosh borer</td>
|
||||
<td>emerald ash borer</td>
|
||||
<td>Multiple phonetic approximations</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>yebby / yebe / yee-be / yeb</td>
|
||||
<td>EAB</td>
|
||||
<td>Whisper interpreting the abbreviation spoken with accent</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>IAB / AAB / EAD / EEA-B / AEB / AB</td>
|
||||
<td>EAB</td>
|
||||
<td>Abbreviation variants</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>four-inch star</td>
|
||||
<td>fourth instar</td>
|
||||
<td>Entomology life stage</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>ovopositor</td>
|
||||
<td>ovipositor</td>
|
||||
<td>Entomology anatomy</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>pre-culture</td>
|
||||
<td>prepupa</td>
|
||||
<td>Entomology life stage</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>ladybeadle</td>
|
||||
<td>lady beetle</td>
|
||||
<td>Common name</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>twice-tapped</td>
|
||||
<td>twice-stabbed</td>
|
||||
<td>Lady beetle common name</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>BDK / Crustacea</td>
|
||||
<td>Btk / kurstaki</td>
|
||||
<td><em>Bacillus thuringiensis</em> subspecies</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>La Grestorhemia / Lagerstrenia</td>
|
||||
<td>Lagerstroemia</td>
|
||||
<td>Crapemyrtle genus</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>natal oaks</td>
|
||||
<td>Nuttall oaks</td>
|
||||
<td>Oak species</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>crab myrtle basket</td>
|
||||
<td>crapemyrtle bark scale</td>
|
||||
<td>Pest common name</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>in the festive fire</td>
|
||||
<td>infested firewood</td>
|
||||
<td>EAB spread pathway</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>can't send John's work</td>
|
||||
<td>St. John's wort</td>
|
||||
<td>CMBS alternate host</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<hr />
|
||||
<p><strong>Total Corrections:</strong> ~120+ individual corrections across 529 subtitle blocks
|
||||
<strong>Processing:</strong> Complete file (529 subtitle blocks, 2116 lines)</p>
|
||||
|
||||
|
||||
|
||||
|
||||
+258
-6
@@ -78,7 +78,7 @@
|
||||
<div data-md-component="skip">
|
||||
|
||||
|
||||
<a href="#extension-agent-version-graziosi-tree-pests" class="md-skip">
|
||||
<a href="#gtbop-webinar-extension-agent-resource" class="md-skip">
|
||||
Skip to content
|
||||
</a>
|
||||
|
||||
@@ -780,6 +780,24 @@
|
||||
|
||||
|
||||
|
||||
<label class="md-nav__link md-nav__link--active" for="__toc">
|
||||
|
||||
|
||||
|
||||
<span class="md-ellipsis">
|
||||
|
||||
|
||||
Extension Agent
|
||||
|
||||
|
||||
|
||||
</span>
|
||||
|
||||
|
||||
|
||||
<span class="md-nav__icon md-icon"></span>
|
||||
</label>
|
||||
|
||||
<a href="./" class="md-nav__link md-nav__link--active">
|
||||
|
||||
|
||||
@@ -797,6 +815,97 @@
|
||||
|
||||
</a>
|
||||
|
||||
|
||||
|
||||
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
<label class="md-nav__title" for="__toc">
|
||||
<span class="md-nav__icon md-icon"></span>
|
||||
Table of contents
|
||||
</label>
|
||||
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
<nav class="md-nav" aria-label="Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies">
|
||||
<ul class="md-nav__list">
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#webinar-details" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Webinar Details
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#ceu-information" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
CEU Information
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#content-summary" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Content Summary
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#key-concepts-for-agent-programs" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Key Concepts for Agent Programs
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#suggested-pairings" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Suggested Pairings
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
</nav>
|
||||
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
|
||||
</nav>
|
||||
|
||||
</li>
|
||||
|
||||
|
||||
@@ -2539,6 +2648,86 @@
|
||||
|
||||
|
||||
|
||||
<label class="md-nav__title" for="__toc">
|
||||
<span class="md-nav__icon md-icon"></span>
|
||||
Table of contents
|
||||
</label>
|
||||
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
<nav class="md-nav" aria-label="Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies">
|
||||
<ul class="md-nav__list">
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#webinar-details" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Webinar Details
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#ceu-information" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
CEU Information
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#content-summary" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Content Summary
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#key-concepts-for-agent-programs" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Key Concepts for Agent Programs
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
<li class="md-nav__item">
|
||||
<a href="#suggested-pairings" class="md-nav__link">
|
||||
<span class="md-ellipsis">
|
||||
|
||||
Suggested Pairings
|
||||
|
||||
</span>
|
||||
</a>
|
||||
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
</nav>
|
||||
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
|
||||
</nav>
|
||||
</div>
|
||||
</div>
|
||||
@@ -2554,12 +2743,75 @@
|
||||
|
||||
|
||||
|
||||
<h1 id="extension-agent-version-graziosi-tree-pests">Extension Agent Version — Graziosi, Tree Pests<a class="headerlink" href="#extension-agent-version-graziosi-tree-pests" title="Permanent link">¶</a></h1>
|
||||
<blockquote>
|
||||
<p><strong>Placeholder</strong> — Paste your Stage 3 pipeline output here.</p>
|
||||
</blockquote>
|
||||
<h1 id="gtbop-webinar-extension-agent-resource">GTBOP Webinar — Extension Agent Resource<a class="headerlink" href="#gtbop-webinar-extension-agent-resource" title="Permanent link">¶</a></h1>
|
||||
<h2 id="understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies">Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies<a class="headerlink" href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" title="Permanent link">¶</a></h2>
|
||||
<hr />
|
||||
<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
|
||||
<h3 id="webinar-details">Webinar Details<a class="headerlink" href="#webinar-details" title="Permanent link">¶</a></h3>
|
||||
<table>
|
||||
<thead>
|
||||
<tr>
|
||||
<th>Field</th>
|
||||
<th>Details</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td><strong>Date</strong></td>
|
||||
<td>January 15, 2026</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><strong>Speaker</strong></td>
|
||||
<td>Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><strong>Moderator</strong></td>
|
||||
<td>Dr. Bodie Pennisi, UGA Horticulturist</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><strong>Duration</strong></td>
|
||||
<td>52 minutes, 11 seconds</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><strong>Series</strong></td>
|
||||
<td>Green & Commercial</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><strong>CEU Categories</strong></td>
|
||||
<td>TBD</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<hr />
|
||||
<h3 id="ceu-information">CEU Information<a class="headerlink" href="#ceu-information" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Applicable License Categories (pending confirmation):</strong>
|
||||
- Category 24 — Ornamental and Turf Pest Control (likely primary)
|
||||
- Category 27 — Right-of-Way Pest Control (possible secondary)</p>
|
||||
<p><strong>Credit Hours:</strong> TBD</p>
|
||||
<p><strong>Viewing Instructions for Asynchronous CEU Delivery:</strong>
|
||||
This archived webinar may be used for self-paced continuing education. Viewers should watch the full presentation (approximately 52 minutes), complete any required assessment activities, and submit documentation per county or program requirements. Sign-in sheets should be submitted to gtbop@uga.edu or mailed to the address printed at the top of the sign-in sheet.</p>
|
||||
<hr />
|
||||
<h3 id="content-summary">Content Summary<a class="headerlink" href="#content-summary" title="Permanent link">¶</a></h3>
|
||||
<p>Dr. Ignazio Graziosi presents a framework for understanding tree pest damage using the disease triangle (pest, host tree, environment) and spiral of tree decline. The presentation is organized around three case studies that cover the major pest-host interaction scenarios landscape professionals encounter:</p>
|
||||
<p><strong>Case Study 1 — Emerald Ash Borer (EAB): Non-native pest on native trees</strong>
|
||||
Covers EAB life cycle and damage identification (water sprouts, D-shaped exit holes, canopy dieback), the role of firewood in spreading the invasion, Georgia's ash species diversity and the white fringetree as an alternate host, the invasion curve concept, importation biological control using specialist parasitoid wasps from Asia, and chemical protection methods (tree injection, bark spray, soil drench). Relevant for agents advising on ash tree conservation and urban forest management.</p>
|
||||
<p><strong>Case Study 2 — Crapemyrtle Bark Scale (CMBS): Non-native pest on non-native trees</strong>
|
||||
Covers CMBS identification (white females, pink eggs, sooty mold), overlapping generations, host range expansion to American beautyberry and St. John's wort, urban heat island effects, chemical control options (soil drench, soil injection, foliar spray — note trunk injection is not effective for crapemyrtle), and the role of lady beetles and green lacewings as predators. Particularly relevant for Georgia agents, as the invasion is still at an early stage in much of the state.</p>
|
||||
<p><strong>Case Study 3 — Orange-Striped Oakworm Moth: Native pest on native trees</strong>
|
||||
Covers life cycle and seasonal timing (late summer/fall, two generations in the South), vulnerability of clonal urban tree plantings with low genetic diversity, natural enemies, and a practical decision framework: 25% defoliation threshold for treatment, and the reduced harm of late-season defoliation. Btk (<em>Bacillus thuringiensis</em> kurstaki) as a selective foliar spray is the recommended first option.</p>
|
||||
<hr />
|
||||
<h3 id="key-concepts-for-agent-programs">Key Concepts for Agent Programs<a class="headerlink" href="#key-concepts-for-agent-programs" title="Permanent link">¶</a></h3>
|
||||
<p>These concepts from the presentation are well-suited for county programming and client consultations:</p>
|
||||
<p><strong>Disease Triangle</strong> — Damage is an interaction of pest, host, and environment. Helps clients understand why the same pest causes different levels of damage in different settings.</p>
|
||||
<p><strong>Spiral of Tree Decline</strong> — Multiple stressor categories (predisposing, inciting, contributing) interact. Soil compaction alone can bring a tree to death. Useful for educating clients on urban tree care beyond pest control.</p>
|
||||
<p><strong>Invasion Curve</strong> — Early detection enables more effective and less costly control. Relevant for CMBS messaging in counties where the pest has not yet established at high levels.</p>
|
||||
<p><strong>Urban Heat Island Effects</strong> — Stresses trees while accelerating insect development. Relevant for any agent working in urban/suburban landscapes.</p>
|
||||
<p><strong>Aesthetic vs. Actual Damage</strong> — The 25% defoliation threshold and seasonal timing consideration help agents advise clients on when treatment is and isn't warranted.</p>
|
||||
<hr />
|
||||
<h3 id="suggested-pairings">Suggested Pairings<a class="headerlink" href="#suggested-pairings" title="Permanent link">¶</a></h3>
|
||||
<p>This webinar complements other GTBOP content covering urban tree care, scale insect management, and integrated pest management principles. It pairs well with presentations on ornamental pest identification, systemic insecticide application, and biological control in landscape settings.</p>
|
||||
<hr />
|
||||
<p><em>Getting the Best of Pests (GTBOP) | UGA Center for Urban Agriculture</em>
|
||||
<em>For questions about CEU delivery or archived webinar use, contact gtbop@uga.edu</em></p>
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<h1 id="website-version-graziosi-tree-pests">Website Version — Graziosi, Tree Pests<a class="headerlink" href="#website-version-graziosi-tree-pests" title="Permanent link">¶</a></h1>
|
||||
<blockquote>
|
||||
<p><strong>Placeholder</strong> — Paste your Stage 3 pipeline output here.</p>
|
||||
</blockquote>
|
||||
<h1 id="gtbop-webinar-archive">GTBOP Webinar Archive<a class="headerlink" href="#gtbop-webinar-archive" title="Permanent link">¶</a></h1>
|
||||
<h2 id="understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies">Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies<a class="headerlink" href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" title="Permanent link">¶</a></h2>
|
||||
<p><strong>Webinar Date:</strong> January 15, 2026
|
||||
<strong>Speaker:</strong> Dr. Ignazio Graziosi, Assistant Professor, Warnell School of Forestry and Natural Resources, University of Georgia
|
||||
<strong>Moderator:</strong> Dr. Bodie Pennisi, UGA Horticulturist
|
||||
<strong>Duration:</strong> 52:11
|
||||
<strong>Series:</strong> Green & Commercial
|
||||
<strong>CEU Categories:</strong> TBD</p>
|
||||
<hr />
|
||||
<h3 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">¶</a></h3>
|
||||
<p>Dr. Ignazio Graziosi, an assistant professor in the Warnell School of Forestry and Natural Resources at the University of Georgia, presents a framework for understanding tree pest damage through ecological interactions. Using the disease triangle and spiral of tree decline, he examines how the pest, host tree, and environment interact to produce damage — particularly in stressful urban settings.</p>
|
||||
<p>Three case studies illustrate different ecological scenarios. The emerald ash borer (EAB), a non-native pest devastating native ash, demonstrates the value of importation biological control using specialist parasitoid wasps from Asia, the invasion curve concept, and the continued importance of chemical protection for high-value trees. Crapemyrtle bark scale (CMBS), a non-native pest on non-native crapemyrtle (<em>Lagerstroemia indica</em>), highlights challenges including overlapping generations, expanding host range to American beautyberry and St. John's wort, urban heat island effects, and the limitations of generalist native predators. The orange-striped oakworm moth, a native pest of native oaks, illustrates how low genetic diversity in clonal urban plantings and environmental stress create vulnerability, with practical guidance on the 25% defoliation threshold and Btk (<em>Bacillus thuringiensis</em> kurstaki) as a selective foliar treatment.</p>
|
||||
<hr />
|
||||
<h3 id="video-chapters">Video Chapters<a class="headerlink" href="#video-chapters" title="Permanent link">¶</a></h3>
|
||||
<p>0:00 Introduction and speaker credentials
|
||||
1:28 The disease triangle: pest, tree, and environment
|
||||
3:02 The spiral of tree decline
|
||||
6:07 Native vs. non-native pest and tree interactions
|
||||
7:22 Example 1: Emerald ash borer (EAB) — overview
|
||||
8:23 EAB life cycle and damage symptoms
|
||||
10:48 EAB generation time and temperature effects
|
||||
11:57 EAB spread across North America and firewood
|
||||
13:47 EAB in Georgia and native ash species diversity
|
||||
15:26 White fringetree as alternate EAB host
|
||||
16:43 Global trade and non-native species introductions
|
||||
18:20 The invasion curve: detection, eradication, and control
|
||||
21:32 Why EAB is not a pest in Asia
|
||||
22:34 Chemical control methods for EAB
|
||||
23:57 Importation biological control: parasitoid wasps
|
||||
28:01 Native natural enemies and the goal of balance
|
||||
29:42 Example 2: Crapemyrtle bark scale (CMBS) — overview
|
||||
31:47 CMBS biology, life cycle, and overlapping generations
|
||||
33:47 CMBS invasion timeline and early detection
|
||||
35:02 CMBS and the invasion curve in Georgia
|
||||
36:06 CMBS host range expansion in North America
|
||||
36:42 Urban heat island effects on scales
|
||||
37:28 Chemical control options for CMBS
|
||||
38:31 Natural enemies: lady beetles and lacewings
|
||||
42:04 Balancing chemical and biological control for CMBS
|
||||
42:25 Example 3: Orange-striped oakworm moth — overview
|
||||
43:53 Oakworm life cycle and seasonal timing
|
||||
44:51 Why urban and clonal trees are vulnerable
|
||||
46:35 Natural enemies of the oakworm
|
||||
47:56 Control decisions: damage thresholds and Btk
|
||||
49:19 Presentation wrap-up and key takeaways
|
||||
50:01 Moderator comments on CMBS expansion in Georgia</p>
|
||||
<hr />
|
||||
<h3 id="questions-answers">Questions & Answers<a class="headerlink" href="#questions-answers" title="Permanent link">¶</a></h3>
|
||||
<p><strong>Q: What is the disease triangle, and why is it important for understanding tree pest damage?</strong>
|
||||
A: The disease triangle describes how damage to a tree results from the interaction of three components: the pest, the host tree, and the environment. Damage is not caused by the pest alone — a susceptible tree in a stressful environment amplifies the impact. Dr. Graziosi emphasized that this framework helps professionals identify which factors they can influence when managing pest problems, particularly in urban settings where environmental stress is high.</p>
|
||||
<p><strong>Q: What is the spiral of tree decline, and how does it relate to tree death in urban environments?</strong>
|
||||
A: The spiral of tree decline is a diagram with three levels of stressors — predisposing factors (such as soil compaction and genetic potential), inciting factors (such as defoliating insects and drought), and contributing factors (such as wood-boring insects, nematodes, and Armillaria). Each level can independently bring a tree to death, and urban environments intensify these stressors. The key takeaway is that tree death typically results from multiple interacting factors rather than a single cause.</p>
|
||||
<p><strong>Q: How does firewood movement contribute to the spread of the emerald ash borer?</strong>
|
||||
A: The movement of infested firewood by campers and travelers was the primary pathway for EAB's rapid spread across North America. Researchers were able to connect the pattern of EAB spread closely with the highway and freeway system. This led to the "Don't Move Firewood" campaign, which also helps contain other invasive insects such as the Asian longhorned beetle.</p>
|
||||
<p><strong>Q: Why is the emerald ash borer not considered a pest in its native range in Asia?</strong>
|
||||
A: Two main reasons explain this. First, native Asian ash species co-evolved with the EAB and are resistant or less susceptible — only very weak, stressed trees are attacked there. Second, a community of specialist natural enemies, including parasitoid wasps, keeps EAB populations low in Asia. This understanding directly informed both the chemical protection approach (making North American trees artificially resistant) and the importation biological control program.</p>
|
||||
<p><strong>Q: What are the chemical control options for protecting ash trees from the emerald ash borer?</strong>
|
||||
A: Three main application methods are available: tree injection, bark spray, and soil drench. Some products can be applied by homeowners while others require a professional applicator. Timing is important — for example, soil drench needs to be applied in spring before leaves emerge. Dr. Graziosi noted that chemical protection remains critical for saving individual high-value trees, since biological control has not yet been fully successful for EAB in North America.</p>
|
||||
<p><strong>Q: Why is trunk injection not effective for controlling crapemyrtle bark scale?</strong>
|
||||
A: Crapemyrtle does not absorb systemic insecticides well through trunk injection — the chemical moves very slowly through the plant, making it an ineffective delivery method. Instead, soil drench, soil injection, and foliar sprays are the recommended chemical control approaches for CMBS. Soaps can also be used to target crawlers, the young mobile nymphs.</p>
|
||||
<p><strong>Q: What native predators help control crapemyrtle bark scale, and what are their limitations?</strong>
|
||||
A: Three lady beetle species — the twice-stabbed lady beetle, the bigeminal lady beetle, and the non-native Harlequin lady beetle — are active predators of CMBS, feeding on both nymphs and adults. Green lacewings, particularly the red-lipped green lacewing, also prey on CMBS nymphs and eggs and are commercially available. However, these predators are generalists that often arrive late in the season and do not build sustained populations on infested trees, limiting their effectiveness as standalone control agents.</p>
|
||||
<p><strong>Q: How should a landscape professional decide whether to treat for orange-striped oakworm?</strong>
|
||||
A: Dr. Graziosi outlined a two-part decision framework. First, distinguish between aesthetic damage and actual harm to the tree — the threshold is approximately 25% defoliation. Second, assess the season: late-season defoliation, even if substantial, is less harmful because the tree has already stored its nutrients. Treatment is most warranted for young or small trees experiencing significant early-season defoliation.</p>
|
||||
<p><strong>Q: Why are urban landscape trees particularly vulnerable to the orange-striped oakworm?</strong>
|
||||
A: Urban landscape trees are often clonal nursery stock with very low genetic variability. Dr. Graziosi used the example of Nuttall oaks on the UGA Athens campus — beautiful, high-quality trees that are essentially genetically identical, meaning the susceptibility of one tree is the susceptibility of all. Combined with urban heat island effects that accelerate insect development, this creates conditions favoring pest outbreaks.</p>
|
||||
<p><strong>Q: What is importation biological control, and how has it been applied to the emerald ash borer?</strong>
|
||||
A: Importation biological control involves studying the natural enemies that effectively control a pest in its native range and introducing them to the invaded region. USDA conducted risk assessments and introduced three specialist parasitoid wasp species from Asia to target EAB. Two species attack EAB larvae under the bark using ovipositors to locate them through vibrational cues, while the third parasitizes EAB eggs. These wasps are specialists that only attack EAB, ensuring they won't harm other insects.</p>
|
||||
<p><strong>Q: What is the significance of the white fringetree for emerald ash borer management in Georgia?</strong>
|
||||
A: The white fringetree, which belongs to the same family (Oleaceae) as ash, was discovered in 2014 to be an alternate host for the EAB. This is significant not only because it means another native plant species is at risk, but more importantly because white fringetree can serve as a population reservoir, allowing EAB to persist in an area even after all ash trees are gone. This has direct implications for long-term management strategies in Georgia.</p>
|
||||
<hr />
|
||||
<h3 id="additional-resources">Additional Resources<a class="headerlink" href="#additional-resources" title="Permanent link">¶</a></h3>
|
||||
<ul>
|
||||
<li>Dr. Graziosi referenced QR codes linking to UGA publications on EAB status and control in Georgia, the full insecticide protocol for EAB, and CMBS biology and management.</li>
|
||||
<li>The iTree tool suite for calculating ecosystem services and benefits of trees, and for right-tree-right-place selection, is available at <a href="https://www.itreetools.org">itreetools.org</a>.</li>
|
||||
<li>Submit sign-in sheets for CEU credit to gtbop@uga.edu or mail to the address on the sign-in sheet.</li>
|
||||
</ul>
|
||||
<hr />
|
||||
<p><em>Getting the Best of Pests (GTBOP) is a continuing education webinar series for pest management and Green Industry professionals, hosted by the University of Georgia Center for Urban Agriculture.</em></p>
|
||||
<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
|
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Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies
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<h1 id="youtube-description-graziosi-tree-pests">YouTube Description — Graziosi, Tree Pests<a class="headerlink" href="#youtube-description-graziosi-tree-pests" title="Permanent link">¶</a></h1>
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<blockquote>
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<p><strong>Placeholder</strong> — Paste your Stage 3 pipeline output here.</p>
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</blockquote>
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<h1 id="gtbop-youtube-description">GTBOP YouTube Description<a class="headerlink" href="#gtbop-youtube-description" title="Permanent link">¶</a></h1>
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<h2 id="understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies">Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies<a class="headerlink" href="#understanding-tree-pests-disease-interactions-invasive-threats-and-management-strategies" title="Permanent link">¶</a></h2>
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<hr />
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<p><em>Processed for UGA Center for Urban Agriculture / GTBOP Archives</em></p>
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<p><strong>Copy everything below this line into the YouTube description field:</strong></p>
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<hr />
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<p>Understanding Tree Pests: Disease Interactions, Invasive Threats, and Management Strategies | GTBOP Webinar Series</p>
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<p>Dr. Ignazio Graziosi, Assistant Professor in the Warnell School of Forestry and Natural Resources at the University of Georgia, presents a framework for understanding tree pest damage through ecological interactions. Using the disease triangle and spiral of tree decline, he examines how the pest, host tree, and environment interact to produce damage — particularly in stressful urban settings.</p>
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<p>Three case studies illustrate different ecological scenarios: the emerald ash borer (EAB), a non-native pest devastating native ash; crapemyrtle bark scale (CMBS), a non-native pest on non-native crapemyrtle; and the orange-striped oakworm moth, a native pest on native oaks. For each, Dr. Graziosi explores host susceptibility, environmental factors, natural enemies, and chemical and biological control strategies, providing a practical decision-making framework for landscape professionals.</p>
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<p>Presented January 15, 2026 | Getting the Best of Pests (GTBOP) Webinar Series | Green & Commercial
|
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Hosted by the UGA Center for Urban Agriculture
|
||||
Moderator: Dr. Bodie Pennisi, UGA Horticulturist</p>
|
||||
<p>⏱️ TIMESTAMPS
|
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0:00 Introduction and speaker credentials
|
||||
1:28 The disease triangle: pest, tree, and environment
|
||||
3:02 The spiral of tree decline
|
||||
6:07 Native vs. non-native pest and tree interactions
|
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7:22 Example 1: Emerald ash borer (EAB) — overview
|
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8:23 EAB life cycle and damage symptoms
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10:48 EAB generation time and temperature effects
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||||
11:57 EAB spread across North America and firewood
|
||||
13:47 EAB in Georgia and native ash species diversity
|
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15:26 White fringetree as alternate EAB host
|
||||
16:43 Global trade and non-native species introductions
|
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18:20 The invasion curve: detection, eradication, and control
|
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21:32 Why EAB is not a pest in Asia
|
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22:34 Chemical control methods for EAB
|
||||
23:57 Importation biological control: parasitoid wasps
|
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28:01 Native natural enemies and the goal of balance
|
||||
29:42 Example 2: Crapemyrtle bark scale (CMBS) — overview
|
||||
31:47 CMBS biology, life cycle, and overlapping generations
|
||||
33:47 CMBS invasion timeline and early detection
|
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35:02 CMBS and the invasion curve in Georgia
|
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36:06 CMBS host range expansion in North America
|
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36:42 Urban heat island effects on scales
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37:28 Chemical control options for CMBS
|
||||
38:31 Natural enemies: lady beetles and lacewings
|
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42:04 Balancing chemical and biological control for CMBS
|
||||
42:25 Example 3: Orange-striped oakworm moth — overview
|
||||
43:53 Oakworm life cycle and seasonal timing
|
||||
44:51 Why urban and clonal trees are vulnerable
|
||||
46:35 Natural enemies of the oakworm
|
||||
47:56 Control decisions: damage thresholds and Btk
|
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49:19 Presentation wrap-up and key takeaways
|
||||
50:01 Moderator comments on CMBS expansion in Georgia</p>
|
||||
<p>❓ Q&A HIGHLIGHTS</p>
|
||||
<p>Q: What is the disease triangle?
|
||||
A: Damage results from the interaction of the pest, the host tree, and the environment — not the pest alone.</p>
|
||||
<p>Q: How does firewood spread the emerald ash borer?
|
||||
A: Infested firewood was the primary pathway for EAB's rapid spread, closely matching the highway system and leading to the "Don't Move Firewood" campaign.</p>
|
||||
<p>Q: Why is trunk injection ineffective for crapemyrtle bark scale?
|
||||
A: Crapemyrtle absorbs systemic insecticides very slowly. Soil drench, soil injection, and foliar sprays are recommended instead.</p>
|
||||
<p>Q: When should you treat for orange-striped oakworm?
|
||||
A: The threshold is about 25% defoliation. Late-season defoliation is less harmful. Btk is effective against young larvae with minimal impact on natural enemies.</p>
|
||||
<p>📚 RESOURCES
|
||||
• Submit sign-in sheets for CEU credit: gtbop@uga.edu
|
||||
• iTree tools for calculating tree benefits: itreetools.org
|
||||
• QR codes for UGA extension publications on EAB and CMBS were shown during the presentation</p>
|
||||
<p>🔗 ABOUT GTBOP
|
||||
Getting the Best of Pests (GTBOP) is a continuing education webinar series for pest management and Green Industry professionals, hosted by the University of Georgia Center for Urban Agriculture.</p>
|
||||
<h1 id="treehealth-emeraldashborer-crapemyrtlebarkscale-pestmanagement-ipm-arboriculture-uga-gtbop-continuingeducation-urbanforestry-biologicalcontrol">TreeHealth #EmeraldAshBorer #CrapemyrtleBarkScale #PestManagement #IPM #Arboriculture #UGA #GTBOP #ContinuingEducation #UrbanForestry #BiologicalControl<a class="headerlink" href="#treehealth-emeraldashborer-crapemyrtlebarkscale-pestmanagement-ipm-arboriculture-uga-gtbop-continuingeducation-urbanforestry-biologicalcontrol" title="Permanent link">¶</a></h1>
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<loc>https://docs.gtbop.com/green-commercial/2026-01-15-graziosi-tree-pests/prose-transcript/</loc>
|
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<lastmod>2026-03-17</lastmod>
|
||||
</url>
|
||||
<url>
|
||||
<loc>https://docs.gtbop.com/green-commercial/2026-01-15-graziosi-tree-pests/activities/GTBOP_Quiz_2026-01-15_TreePests_Graziosi/</loc>
|
||||
<lastmod>2026-03-17</lastmod>
|
||||
</url>
|
||||
<url>
|
||||
<loc>https://docs.gtbop.com/green-commercial/2026-01-15-graziosi-tree-pests/activities/GTBOP_ReviewPrompts_2026-01-15_TreePests_Graziosi/</loc>
|
||||
<lastmod>2026-03-17</lastmod>
|
||||
</url>
|
||||
<url>
|
||||
<loc>https://docs.gtbop.com/green-commercial/2026-01-15-graziosi-tree-pests/activities/matching/</loc>
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<lastmod>2026-03-17</lastmod>
|
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