​​​Herbicide-Resistant Common Ragweed Management in Cotton

May 2017 | 26 min., 39 sec.
by Charlie Cahoon
Virginia Tech

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.

About the Presenter

Charlie CahoonCharlie Cahoon is an Extension Weed Specialist and Assistant Professor at Virginia Tech. His research focuses on developing innovative and sustainable weed management solutions for row crops and vegetables. Additionally, at the forefront of his research are management of herbicide-resistant common ragweed, horseweed, Palmer amaranth, and Italian ryegrass and preemptive measures for avoidin​g future herbicide resistance. He is also committed to promoting proper stewardship of new herbicide technologies. He received both his BS and PhD from North Carolina State University. His graduate work was conducted under the direction of Drs. Alan York and David Jordan and focused on herbicide-resistant Palmer amaranth management in cotton. In his spare time, Charlie enjoys hunting, fishing, farming, tinkering on his 1962 JD1010 tractor, and traveling with his wife.

Contact Information:
Email: cwcahoon@vt.edu

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