79 lines
4.7 KiB
Markdown
79 lines
4.7 KiB
Markdown
|
# GTBOP YouTube Description
|
||
|
|
## Weed Control in Turf — A Review of the Basics and Recent Updates
|
||
|
|
|
||
|
|
---
|
||
|
|
|
||
|
|
Weed Control in Turf: A Review of the Basics and Recent Updates with Dr. Patrick McCullough
|
||
|
|
|
||
|
|
Dr. Patrick McCullough, Weed Scientist at the University of Georgia, delivers a comprehensive review of turfgrass weed management covering identification fundamentals, cultural practices, pre-emergent herbicide science, herbicide resistance issues in Georgia, and new products for 2018 including halauxifen-based herbicides from Dow, Vexis, Solero, Dismiss NXT, and the combination product Coastal.
|
||
|
|
|
||
|
|
Topics include distinguishing weed species by seed heads, ligules, flowers, and leaf characteristics; the impact of mowing height and irrigation on weed competition; pre-emergent application timing by Georgia region; split application strategies; herbicide resistance mechanisms and management programs for Poa annua and resistant sedges; and detailed profiles of seven new turfgrass herbicide products.
|
||
|
|
|
||
|
|
Presented for the GTBOP (Getting the Best of Pests) Green & Commercial Webinar Series
|
||
|
|
University of Georgia Center for Urban Agriculture
|
||
|
|
Webinar Date: November 17, 2017
|
||
|
|
CEU Category: 24 (Ornamental and Turf Pest Control)
|
||
|
|
|
||
|
|
🔗 Resources mentioned in this presentation:
|
||
|
|
• GeorgiaWeather.net — Local soil temperature tracking for application timing
|
||
|
|
• Color Atlas of Turfgrass Weeds (GCSAA)
|
||
|
|
• Weeds of Southern Turfgrass (UGA publication)
|
||
|
|
|
||
|
|
TIMESTAMPS:
|
||
|
|
0:00 Introduction
|
||
|
|
0:46 Weed Identification Books and Resources
|
||
|
|
2:00 Weed Categories: Grassy, Broadleaf, and Grass-Like
|
||
|
|
2:43 Identification by Seed Heads
|
||
|
|
3:57 Comparing Bahiagrass and Dallisgrass
|
||
|
|
5:13 Poa annua Seed Head Identification
|
||
|
|
5:34 Using Ligules for Grassy Weed Identification
|
||
|
|
6:50 Broadleaf Weed Flowers and Day Flower Species
|
||
|
|
7:52 Leaf Arrangement and Hair Characteristics
|
||
|
|
9:34 Leaf Markings: White Clover vs. Spotted Burr Clover
|
||
|
|
10:16 Weed Lifecycles: Winter and Summer Annuals
|
||
|
|
12:05 Perennial Weeds: Simple and Complex
|
||
|
|
16:02 Scouting, Early Detection, and Cultural Practices
|
||
|
|
17:08 Mowing Height Effects on Crabgrass Competition
|
||
|
|
20:07 Irrigation Influence on Weed Populations
|
||
|
|
22:05 Seed Quality and Seedlot Contamination
|
||
|
|
24:07 How Pre-Emergent Herbicides Work
|
||
|
|
27:00 Pre-Emergent Product Overview and Formulations
|
||
|
|
29:00 Pre-Emergent Targets and Limitations
|
||
|
|
29:38 Herbicide Activation: Sprayable vs. Granular
|
||
|
|
31:07 Spring Application Timing by Georgia Region
|
||
|
|
32:52 Residual Activity and Product Selection
|
||
|
|
34:48 Fall Pre-Emergent Timing for Winter Annuals
|
||
|
|
35:11 Split Applications for Extended Control
|
||
|
|
36:21 Fall Products for Poa annua Management
|
||
|
|
37:31 Herbicide Resistance: Overview and Mechanisms
|
||
|
|
41:01 Poa annua Resistance in Georgia
|
||
|
|
43:34 Fall Post-Emergent Timing and Sulfonylurea Programs
|
||
|
|
48:55 Poa annua Control Programs by Turfgrass Species
|
||
|
|
51:38 Sedge Resistance to Sulfonylureas
|
||
|
|
53:44 Other Herbicide-Resistant Weed Species
|
||
|
|
55:01 New for 2018: Halauxifen Products (RELZAR, Game On, Switchblade)
|
||
|
|
1:01:22 New for 2018: Vexis (Pyrimisulfan + Penoxsulam)
|
||
|
|
1:05:31 Solero (Mesosulfuron) from Nufarm
|
||
|
|
1:06:27 Dismiss NXT (Sulfentrazone + Carfentrazone)
|
||
|
|
1:08:19 Coastal: Three-Way Pre + Post Combination from Sipcam
|
||
|
|
1:09:53 Conclusion
|
||
|
|
|
||
|
|
QUESTIONS ADDRESSED IN THIS PRESENTATION:
|
||
|
|
|
||
|
|
Q: What are the key characteristics used to identify grassy and broadleaf weeds?
|
||
|
|
A: McCullough covers seed heads, ligules, flowers, leaf arrangement, pubescence, and leaf markings, with specific examples including bahiagrass vs. dallisgrass, crabgrass species differentiation, and day flower identification.
|
||
|
|
|
||
|
|
Q: How do cultural practices affect weed populations?
|
||
|
|
A: Research shows raising tall fescue mowing height from 1 to 4 inches reduced crabgrass from 95% to 0% cover. A Florida study found daily irrigation increased dollarweed five- to six-fold compared to as-needed watering.
|
||
|
|
|
||
|
|
Q: How do pre-emergent herbicides work?
|
||
|
|
A: Pre-emergent herbicides bind in the upper soil profile, are absorbed by germinating seedling roots and shoots, and inhibit cell division. They do not prevent germination — seedlings must first emerge and take in the product.
|
||
|
|
|
||
|
|
Q: What herbicide resistance issues is Georgia facing?
|
||
|
|
A: Widespread Poa annua resistance to dinitroaniline pre-emergents and sulfonylurea post-emergents, plus halosulfuron-resistant sedge populations. McCullough recommends combining modes of action for resistance management.
|
||
|
|
|
||
|
|
Q: What new herbicide products are coming for 2018?
|
||
|
|
A: RELZAR, Game On, and Switchblade (halauxifen from Dow); Vexis (pyrimisulfan + penoxsulam); Solero (mesosulfuron from Nufarm); Dismiss NXT (sulfentrazone + carfentrazone from FMC); and Coastal (simazine + imazaquin + prodiamine from Sipcam).
|
||
|
|
|
||
|
|
#turfgrass #weedcontrol #pestmanagement #UGA #GTBOP #CEU #lawncare #herbicide #preemergent #poaannua
|