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Resistance of Enlist (AAD-12) Cotton to Glufosinate

Published online by Cambridge University Press:  19 June 2017

L. Bo Braxton*
Affiliation:
Research Scientists, Dow AgroSciences LLC, Indianapolis, IN 46268
John S. Richburg
Affiliation:
Research Scientists, Dow AgroSciences LLC, Indianapolis, IN 46268
Alan C. York
Affiliation:
William Neal Reynolds Professor Emeritus, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC 27695
A. Stanley Culpepper
Affiliation:
Professor, Department of Crop and Soil Sciences, University of Georgia, Tifton, GA 31794
Robert A. Haygood
Affiliation:
Research Scientists, Dow AgroSciences LLC, Indianapolis, IN 46268
Michael L. Lovelace
Affiliation:
Research Scientists, Dow AgroSciences LLC, Indianapolis, IN 46268
D. Hunter Perry
Affiliation:
Research Scientists, Dow AgroSciences LLC, Indianapolis, IN 46268
Larry C. Walton
Affiliation:
Research Scientists, Dow AgroSciences LLC, Indianapolis, IN 46268
*
*Corresponding author’s E-mail: [email protected]

Abstract

Enlist™ cotton contains the aad-12 and pat genes that confer resistance to 2,4-D and glufosinate, respectively. Thirty-three field trials were conducted focused on Enlist cotton injury from glufosinate as affected by cotton growth stage, application rate, and single or sequential applications. Maximum injury from a single application of typical 1X (542 g ae ha-1) and 2X use rates was 3 and 13%, respectively, regardless of growth stage. Injury from sequential applications of 1X or 2X rates was equivalent to single applications. Similar injury was observed with four commercial formulations of glufosinate. Cotton yield was never affected by glufosinate. This research demonstrates Enlist™ cotton has robust resistance to glufosinate at rates at least twice the typical use rate when applied once or twice at growth stages ranging from 2 to 12 leaves.

Type
Note
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Daniel Stephenson, Louisana State University Agricultural Center.

References

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