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on Cotton

Herbicide-resistant Common
Ragweed Management in Cotton

May 2017

By Charlie Cahoon, Ph.D.
Assistant Professor
Extension Weed Specialist
Virginia Tech
757-414-0724 ext. 13

Watch Presentation (26 min 39 sec)

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Summary: Glyphosate once provided excellent control of common ragweed. Unfortunately, excessive reliance on glyphosate and the reduction in use of other herbicides led to selection for resistant biotypes. This presentation will help consultants, county agents, cotton producers, and other practitioners in the Southern U.S. cotton-producing states to understand the biology and better manage herbicide-resistant common ragweed. Specifically, this presentation will introduce the audience to common ragweed, its history of herbicide-resistance, and tactics for managing the weed in cotton. To conclude the presentation, Dr. Cahoon will discuss two cotton experiments; one focused on common ragweed control by residual herbicides and the other pertaining to postemergence control of the weed.

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