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1 June 2017 Resistance of Enlist™ (AAD-12) Cotton to Glufosinate
L. Bo Braxton, John S. Richburg, Alan C. York, A. Stanley Culpepper, Robert A. Haygood, Michael L. Lovelace, D. Hunter Perry, Larry C. Walton
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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.

Nomenclature: Glufosinate; 2,4-D; cotton, Gossypium hirsutum L.

© Weed Science Society of America, 2017
L. Bo Braxton, John S. Richburg, Alan C. York, A. Stanley Culpepper, Robert A. Haygood, Michael L. Lovelace, D. Hunter Perry, and Larry C. Walton "Resistance of Enlist™ (AAD-12) Cotton to Glufosinate," Weed Technology 31(3), 380-386, (1 June 2017). https://doi.org/10.1017/wet.2017.14
Received: 17 November 2016; Accepted: 1 January 2017; Published: 1 June 2017
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KEYWORDS
Aryloxyalkanoate dioxygenase
DAS-81910-7
Herbicide-resistant crops
phosphinothricin acetyltransferase
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