​​Glyphosate-Resistant Johnsongrass Management

December 2016 | 21 min., 50 sec.
by Daniel O. Stephenson, IV
Louisiana State University
https://doi.org/10.1094/GROW-COT-12-16-089

Summary

​This presentation will help consultants, county agents, growers, and other practitioners in the Southern U.S. cotton-producing states in the development of glyphosate-resistant johnsongrass management plans. Specifically in this presentation, individuals will learn that postemergence applications of Liberty are effective for control of glyphosate-resistant johnsongrass, but if applied alone, multiple applications are needed for full-season management. However, only two applications are needed if Liberty is tank-mixed with a graminicide such as Select Max. The best practice for season-long management of glyphosate-resistant johnsongrass is a program that contains preplant, preemergence, early- and mid-postemergence, and layby herbicide applications. Furthermore, proper herbicide selection in a cotton and corn rotation offers another tool for management of glyphosate-resistant johnsongrass. Finally, practicing good sanitation, such as cleaning harvesting and tillage equipment before leaving an area infested with glyphosate-resistant johnsongrass, will help to prevent movement of this pest.

About the Presenter

Daniel O. Stephenson, IV​ Daniel O. Stephenson, IV was raised on a peanut, cotton, and cattle farm in southeast Alabama. He earned a BS in Agronomy in 1998 and a MS in Agronomy with a focus on weed science in 2000 at Auburn University. He then attended the University of Arkansas, where he earned a PhD in Crop, Soils, and Environmental Sciences with a focus on weed science in 2004. After graduation, Daniel accepted a position as a postdoctoral research associate at the University of Florida working with row crops and turfgrass. Then he became the Cropping Systems Agronomist with the University of Arkansas located at the Northeast Research and Extension Center. In 2008, Daniel accepted a weed scientist position with the LSU AgCenter. He is responsible for development of weed management programs in corn, cotton, grain sorghum, soybean, and wheat and is also the lead herbicide resistance investigator for the LSU AgCenter. In addition, Daniel is the Field Crops Coordinator at the Dean Lee Research and Extension Center.​

Contact Information:
Email: dstephenson@agcenter.lsu.edu

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