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McCullough — Weed Control in Turf (Nov 2017)
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McCullough — Weed Control in Turf (Nov 2017)
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Weed Control in Turf — A Review of the Basics and Recent Updates
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2026-03-17 12:26:46 -04:00
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Graziosi — Tree Pests (Jan 2026)
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2026-03-17 12:26:46 -04:00
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2026-03-17 12:26:46 -04:00
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Weed Control in Turf — A Review of the Basics and Recent Updates
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Review Task 1: Weed Identification Characteristics
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< h1 id = "gtbop-moodle-review-activities" > GTBOP Moodle Review Activities< a class = "headerlink" href = "#gtbop-moodle-review-activities" title = "Permanent link" > ¶ < / a > < / h1 >
< h2 id = "weed-control-in-turf-a-review-of-the-basics-and-recent-updates" > Weed Control in Turf — A Review of the Basics and Recent Updates< a class = "headerlink" href = "#weed-control-in-turf-a-review-of-the-basics-and-recent-updates" title = "Permanent link" > ¶ < / a > < / h2 >
< p > < strong > Webinar Date:< / strong > November 17, 2017
< strong > Speaker:< / strong > Dr. Patrick McCullough, Weed Scientist, University of Georgia
< strong > Series:< / strong > Green & Commercial
< strong > Course Context:< / strong > Weed Science Certificate Course
< strong > Source:< / strong > Corrected SRT (Stage 1) + Archive Package (Stage 2)< / p >
< hr / >
< h3 id = "review-task-1-weed-identification-characteristics" > Review Task 1: Weed Identification Characteristics< a class = "headerlink" href = "#review-task-1-weed-identification-characteristics" title = "Permanent link" > ¶ < / a > < / h3 >
< p > < strong > Watch:< / strong > 2:43 –
< strong > Task:< / strong > As McCullough walks through the diagnostic characteristics used to identify weed species, list the six types of characteristics he covers and note one specific example species he uses to illustrate each.
< strong > Key Points to Identify:< / strong >
- Seed heads (e.g., bahiagrass vs. dallisgrass, Poa annua panicle)
- Ligules (e.g., barnyardgrass absent ligule vs. crabgrass fleshy ligule)
- Flowers (e.g., two-petal vs. three-petal day flower species)
- Leaf arrangement on stems (alternate vs. opposite)
- Pubescence/hairs (e.g., smooth crabgrass vs. large crabgrass vs. southern crabgrass)
- Leaf markings (e.g., white clover chevron vs. spotted burr clover purple dot)< / p >
< hr / >
< h3 id = "review-task-2-cultural-practices-and-weed-competition" > Review Task 2: Cultural Practices and Weed Competition< a class = "headerlink" href = "#review-task-2-cultural-practices-and-weed-competition" title = "Permanent link" > ¶ < / a > < / h3 >
< p > < strong > Watch:< / strong > 17:08 –
< strong > Task:< / strong > McCullough presents two research studies demonstrating how cultural practices influence weed populations. Summarize the key finding of each study, including the specific numbers he provides.
< strong > Key Points to Identify:< / strong >
- Mowing height study: tall fescue at 1 inch vs. 4 inches — crabgrass reduced from 95% to 0%
- Irrigation study: daily watering vs. as-needed — dollarweed cover increased 5–
- The connection between these findings and reducing the need for herbicide inputs< / p >
< hr / >
< h3 id = "review-task-3-pre-emergent-herbicide-mechanism" > Review Task 3: Pre-Emergent Herbicide Mechanism< a class = "headerlink" href = "#review-task-3-pre-emergent-herbicide-mechanism" title = "Permanent link" > ¶ < / a > < / h3 >
< p > < strong > Watch:< / strong > 24:07 –
< strong > Task:< / strong > McCullough explains a common misconception about how pre-emergent herbicides work. Identify what pre-emergent herbicides do NOT do and then describe the actual mechanism in three steps (where the product goes, how the weed encounters it, what happens to the seedling).
< strong > Key Points to Identify:< / strong >
- Pre-emergents do NOT prevent germination
- Product binds in the upper half-inch of the soil profile
- Germinating seedling roots and shoots absorb the herbicide from soil water solution
- Herbicide inhibits cell division; seedling fails to establish healthy roots and dies< / p >
< hr / >
< h3 id = "review-task-4-herbicide-resistance-selection-pressure" > Review Task 4: Herbicide Resistance Selection Pressure< a class = "headerlink" href = "#review-task-4-herbicide-resistance-selection-pressure" title = "Permanent link" > ¶ < / a > < / h3 >
< p > < strong > Watch:< / strong > 37:31 –
< strong > Task:< / strong > McCullough uses a year-by-year diagram to explain how herbicide resistance develops through selection pressure. Trace the progression from Year 1 through Year 5 and explain why simply increasing the herbicide rate does not solve the problem.
< strong > Key Points to Identify:< / strong >
- Year 1: one naturally resistant biotype survives among susceptible population
- Repeated applications kill susceptible plants, allowing resistant biotype to reproduce
- By Year 5: resistant biotype dominates the population
- Target-site resistance: altered binding site means the herbicide simply does not work regardless of rate (300x rate example with Monument)< / p >
< hr / >
< h3 id = "review-task-5-resistance-management-through-mode-of-action-combinations" > Review Task 5: Resistance Management Through Mode of Action Combinations< a class = "headerlink" href = "#review-task-5-resistance-management-through-mode-of-action-combinations" title = "Permanent link" > ¶ < / a > < / h3 >
< p > < strong > Watch:< / strong > 46:05 –
< strong > Task:< / strong > McCullough describes the results of resistance management trials at three golf courses. For each course, note which herbicides worked, which failed, and explain why the combination of a sulfonylurea with simazine succeeded at all three locations.
< strong > Key Points to Identify:< / strong >
- Different resistance profiles at each golf course (Barricade-resistant at courses 1 and 2; simazine-resistant at courses 1 and 3; sulfonylurea-resistant at course 2)
- Specticle controlled dinitroaniline-resistant Poa at all sites
- Sulfonylurea + simazine combination provided complete control at all three courses
- Cost-effectiveness: simazine adds a second mode of action for ~$5/acre< / p >
< hr / >
< h3 id = "review-task-6-new-product-comparison-halauxifen-formulations" > Review Task 6: New Product Comparison — Halauxifen Formulations< a class = "headerlink" href = "#review-task-6-new-product-comparison-halauxifen-formulations" title = "Permanent link" > ¶ < / a > < / h3 >
< p > < strong > Watch:< / strong > 55:01 –
< strong > Task:< / strong > McCullough introduces three new products from Dow that all contain halauxifen. Create a comparison noting the other active ingredients in each product, which turfgrass species each is labeled for, and which product would be appropriate for a centipedegrass lawn.
< strong > Key Points to Identify:< / strong >
- RELZAR: halauxifen + florasulam — all major warm and cool-season species; one labeled rate
- Game On: halauxifen + 2,4-D choline + fluroxypyr — primarily cool-season grasses plus bermudagrass and zoysiagrass; NOT centipedegrass or St. Augustinegrass (2,4-D sensitivity)
- Switchblade: halauxifen + dicamba + fluroxypyr — warm and cool-season including centipedegrass and St. Augustinegrass
- For a centipedegrass lawn: RELZAR or Switchblade, not Game On< / p >
< hr / >
< h2 id = "review-activity-summary" > Review Activity Summary< a class = "headerlink" href = "#review-activity-summary" title = "Permanent link" > ¶ < / a > < / h2 >
< p > < strong > Total Tasks:< / strong > 6
< strong > Coverage Distribution:< / strong >
- Weed Identification (early): Task 1
- Cultural Practices (early-mid): Task 2
- Pre-Emergent Science (mid): Task 3
- Herbicide Resistance (mid-late): Tasks 4, 5
- New Products (late): Task 6< / p >
< p > < strong > Design Notes:< / strong > Tasks are structured to guide self-paced viewing by directing learners to specific segments. Each task asks for synthesis beyond simple recall — listing, comparing, tracing progressions, or correcting misconceptions — to promote active engagement with the video content.< / p >
< hr / >
< p > < em > Generated for UGA Center for Urban Agriculture / GTBOP Moodle Certificate Course — Weed Science< / em >
< em > Source: Corrected SRT (Stage 1) — GTBOP_Transcript_2017-11-17_WeedControlTurf.srt (649 blocks)< / em > < / p >
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