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T
Rich Braman 35abd57645 Apply UGA brand visual identity and accessibility improvements 
Restyle site to align with brand.uga.edu guidelines: Bulldog Red primary,
Olympic/Lake Herrick accents, Oswald headings, Merriweather Sans body text.
Add WCAG AA-compliant dark mode, skip-to-content link, focus indicators,
and underlined content links for Section 508 compliance.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-17 21:56:36 -04:00

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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">&para;</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">&para;</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 &amp; 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">&para;</a></h3>
<p><strong>Watch:</strong> 2:43 – 9:33
<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">&para;</a></h3>
<p><strong>Watch:</strong> 17:08 – 21:26
<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 5–6 fold with daily irrigation
- 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">&para;</a></h3>
<p><strong>Watch:</strong> 24:07 – 27:00
<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">&para;</a></h3>
<p><strong>Watch:</strong> 37:31 – 43:33
<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">&para;</a></h3>
<p><strong>Watch:</strong> 46:05 – 50:48
<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">&para;</a></h3>
<p><strong>Watch:</strong> 55:01 – 1:01:21
<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">&para;</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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