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Rich Braman
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site/green-commercial/2021-11-18-czarnota-weed-control/archive-summary/index.html
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<p>The bulk of the presentation focused on chemical weed control, covering the distinction between pre-emergent and post-emergent herbicides, selective versus non-selective products, and granular versus sprayable formulations. Czarnota highlighted underutilized products including Dimension (dithiopyr) and Marengo (indaziflam), which can provide up to 16 weeks of pre-emergent control in established woody ornamentals. He reviewed modes of action for key herbicides including glyphosate's inhibition of the EPSP synthase pathway and the dinitroaniline herbicides' disruption of microtubule formation. Czarnota also discussed glyphosate safety, citing a 2017 Journal of the National Cancer Institute study of nearly 45,000 licensed applicators finding no association between glyphosate use and cancer incidence above national background rates. The session concluded with audience questions on torpedograss control using Drive (quinclorac), Virginia buttonweed management with atrazine, and selective bermudagrass control in ornamentals using clethodim (Envoy).</p>
<hr />
<h2 id="youtube-timestamps">YOUTUBE TIMESTAMPS<a class="headerlink" href="#youtube-timestamps" title="Permanent link">&para;</a></h2>
<p>0:00 Introduction and Speaker Background
3:02 What Is a Weed? Definitions and Weediness Predictors
5:13 Challenging Weed Problems in Nursery Production
9:03 Weed Identification and Plant Life Cycles
11:55 Weed Control Methods: Physical Removal and Barriers
15:44 Biological Control: Grass Carp, Goats, Thistle Weevil
19:50 Chemical Weed Control: Impact of Major Herbicides
21:07 Pre-Emergent vs. Post-Emergent Herbicides
25:16 Trade Names, Active Ingredients, and Cost Savings
26:20 Herbicide Modes of Action
29:42 Pre-Emergent Herbicides for Landscape and Nursery
31:17 Post-Emergent and Combination Herbicides
35:16 Recommended Products: Marengo, BroadStar, SureGuard
36:40 Best Practices and Common Application Errors
40:21 Herbicide Fate, Organic Options, and Glyphosate Safety
43:40 Glyphosate Damage, Adjuvants, and Future Technologies
44:54 Q&amp;A: Torpedograss, Virginia Buttonweed, Bermudagrass Control</p>
<table>
<thead>
<tr>
<th>Timestamp</th>
<th>Topic</th>
</tr>
</thead>
<tbody>
<tr>
<td>0:00</td>
<td>Introduction and Speaker Background</td>
</tr>
<tr>
<td>3:02</td>
<td>What Is a Weed? Definitions and Weediness Predictors</td>
</tr>
<tr>
<td>5:13</td>
<td>Challenging Weed Problems in Nursery Production</td>
</tr>
<tr>
<td>9:03</td>
<td>Weed Identification and Plant Life Cycles</td>
</tr>
<tr>
<td>11:55</td>
<td>Weed Control Methods: Physical Removal and Barriers</td>
</tr>
<tr>
<td>15:44</td>
<td>Biological Control: Grass Carp, Goats, Thistle Weevil</td>
</tr>
<tr>
<td>19:50</td>
<td>Chemical Weed Control: Impact of Major Herbicides</td>
</tr>
<tr>
<td>21:07</td>
<td>Pre-Emergent vs. Post-Emergent Herbicides</td>
</tr>
<tr>
<td>25:16</td>
<td>Trade Names, Active Ingredients, and Cost Savings</td>
</tr>
<tr>
<td>26:20</td>
<td>Herbicide Modes of Action</td>
</tr>
<tr>
<td>29:42</td>
<td>Pre-Emergent Herbicides for Landscape and Nursery</td>
</tr>
<tr>
<td>31:17</td>
<td>Post-Emergent and Combination Herbicides</td>
</tr>
<tr>
<td>35:16</td>
<td>Recommended Products: Marengo, BroadStar, SureGuard</td>
</tr>
<tr>
<td>36:40</td>
<td>Best Practices and Common Application Errors</td>
</tr>
<tr>
<td>40:21</td>
<td>Herbicide Fate, Organic Options, and Glyphosate Safety</td>
</tr>
<tr>
<td>43:40</td>
<td>Glyphosate Damage, Adjuvants, and Future Technologies</td>
</tr>
<tr>
<td>44:54</td>
<td>Q&amp;A: Torpedograss, Virginia Buttonweed, Bermudagrass Control</td>
</tr>
</tbody>
</table>
<hr />
<h2 id="questions-answers">QUESTIONS &amp; ANSWERS<a class="headerlink" href="#questions-answers" title="Permanent link">&para;</a></h2>
<p><strong>Q: What are the most important characteristics that make a plant likely to become a weed problem?</strong>