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# GTBOP Webinar Archive — Extension Agent Version

## Weed Control in Turf — A Review of the Basics and Recent Updates

### Webinar Details

Field | Details
--- | ---
Speaker | Dr. Patrick McCullough, Weed Scientist, University of Georgia
Webinar Date | November 17, 2017
Duration | 1 hour, 10 minutes
Series | Green & Commercial
Format | Pre-recorded presentation (no live Q&A segment)

### CEU Credit Information

Category | Description | Applicable
--- | --- | ---
24 | Ornamental and Turf Pest Control | Yes

This webinar is eligible for asynchronous CEU viewing. The full presentation runs 1:10:00.

### Content Overview

This presentation provides a thorough review of weed management fundamentals for turfgrass professionals, making it well-suited for both new applicators building foundational knowledge and experienced practitioners seeking updates on resistance management and new products.

Part 1 — Weed Identification Fundamentals (0:00–10:15) McCullough covers the three weed classification categories (grassy, broadleaf, grass-like), recommended identification books, and diagnostic characteristics: seed heads, ligules, flowers, leaf arrangement, pubescence, and leaf markings. Practical examples include distinguishing bahiagrass from dallisgrass and identifying crabgrass species.

Part 2 — Weed Lifecycles and Cultural Practices (10:16–24:06) Covers winter annuals, summer annuals, simple perennials, and complex perennials with management implications for each. Presents research data on mowing height effects (crabgrass in tall fescue), irrigation impacts (dollarweed study), and the importance of certified seed quality.

Part 3 — Pre-Emergent Herbicide Science (24:07–36:20) Detailed explanation of how pre-emergent herbicides work in the soil, product formulations (sprayable vs. granular), activation requirements, residual activity differences among products, spring and fall application timing for Georgia, and split application strategies.

Part 4 — Herbicide Resistance (37:31–55:00) Major section on resistance mechanisms, selection pressure, and current resistance issues in Georgia including Poa annua resistance to dinitroanilines and sulfonylureas, and halosulfuron-resistant sedge populations. Includes resistance management programs tested on three golf courses demonstrating the value of combining modes of action.

Part 5 — New Products for 2018 (55:01–1:09:53) Profiles of seven new herbicide products: RELZAR, Game On, and Switchblade (halauxifen-based, Dow); Vexis (pyrimisulfan + penoxsulam); Solero (mesosulfuron, Nufarm); Dismiss NXT (sulfentrazone + carfentrazone, FMC); and Coastal (simazine + imazaquin + prodiamine, Sipcam).

### Viewing Instructions for Asynchronous CEU Use

This webinar is a single continuous presentation with no live Q&A segment. County agents may assign the full recording for individual viewing. Video chapters are available at the timestamps listed in the full archive package for agents who wish to direct viewers to specific segments.

Key segments for targeted viewing: - Applicators needing identification refreshers: 0:00–10:15 (15 min) - Pre-emergent timing and product selection: 24:07–36:20 (12 min) - Herbicide resistance awareness and management: 37:31–55:00 (18 min) - New product updates: 55:01–1:09:53 (15 min)

### Resources Referenced

- GeorgiaWeather.net — Soil temperature tracking for pre-emergent application timing
- Color Atlas of Turfgrass Weeds (GCSAA publication)
- Weeds of Southern Turfgrass (UGA publication)

Processed for UGA Center for Urban Agriculture / GTBOP Archives Source: Stage 2 Archive Package — GTBOP_Archive_Summary_2017-11-17_WeedControlTurf.md