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- The Cooperative Extension Service was formalized in 1914, with the Smith-Lever Act establishing a partnership between American agricultural colleges and the U.S. Department of Agriculture. Read more...
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How do I control glyphosate-resistant horseweed (mare's-tail) in my cotton field?
The best way to control horseweed is to kill it with your burndown herbicide application. Typically, either dicamba or 2,4-D is tank mixed with glyphosate during the burndown application. These products will severely injure or kill cotton if not applied properly. When using dicamba, a minimum of 1 inch of rainfall and a 21-day waiting period per 8 ounces used is required before cotton can be planted. A 30-day waiting period between application and cotton planting is required for 2,4-D.
The application of a preemergence herbicide at planting will provide residual control of horseweed by preventing later emerging seedlings from becoming established.
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