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Control of Volunteer Corn with the AAD-1 (aryloxyalkanoate dioxygenase-1) Transgene in Soybean

Published online by Cambridge University Press:  20 January 2017

Nader Soltani ,
Christy Shropshire  and
Peter H. Sikkema
Nader Soltani*
Affiliation:
Department of plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street E., Ridgetown, Ontario, Canada N0P 2C0
Christy Shropshire
Affiliation:
Department of plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street E., Ridgetown, Ontario, Canada N0P 2C0
Peter H. Sikkema
Affiliation:
Department of plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street E., Ridgetown, Ontario, Canada N0P 2C0
*
Corresponding author's E-mail: soltanin@uoguelph.ca.
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Abstract

Volunteer Enlist corn with the AAD-1 (aryloxyalkanoate dioxygenase-1) transgene can become a problem when glyphosate-resistant (GR) soybean follows Enlist corn in the rotation. Field trials were conducted at Ridgetown, Ontario in 2013 and 2014 to evaluate the control of volunteer Enlist corn in GR soybean. Glyphosate plus clethodim at 30 g ai ha−1 provided 75 to 92% control of volunteer Enlist corn at 1, 2, 4, and 8 weeks after treatment application (WAT) and reduced volunteer Enlist corn density and dry weight 95 to 97%. Glyphosate plus clethodim at 60 g ai ha−1 provided 84 to 98% control of volunteer Enlist corn at 1, 2, 4, and 8 WAT and reduced volunteer Enlist corn density and dry weight 97 to 99%. Glyphosate plus sethoxydim at 150 g ai ha−1 provided 66 to 86% control of volunteer Enlist corn at 1, 2, 4, and 8 WAT and reduced volunteer Enlist corn density and dry weight 91 to 97%. Glyphosate plus sethoxydim at 300 g ha−1 provided 84 to 96% control of volunteer Enlist corn at 1, 2, 4, and 8 WAT and reduced volunteer Enlist corn density and dry weight 96 to 98%. Glyphosate plus fenoxaprop-p-ethyl, fluazifop-p-butyl, and quizalofop-p-ethyl applied POST provided 0 to 9% control of volunteer Enlist corn at 1, 2, 4, and 8 WAT and reduced volunteer Enlist corn density and dry weight 18 to 44%. Soybean yields closely reflected the level of volunteer Enlist corn control. Based on these results, the cyclohexanedione herbicides, clethodim and sethoxydim, provide adequate control of volunteer Enlist corn in GR soybean. In contrast, the aryloxyphenoxypropionate herbicides, fenoxaprop-p-ethyl, fluazifop-p-butyl and quizalofop-p-ethyl do not provide control of volunteer Enlist corn in GR soybean.

El maíz Enlist voluntario con el transgen AAD-1 (aryloxyalkanoate dioxygenase-1) puede convertirse en un problema cuando soja resistente a glyphosate (GR) se siembra luego de maíz Enlist en la rotación de cultivos. En 2013 y 2014 en Ridgetown, Ontario, se realizaron estudios de campo para evaluar el control de maíz Enlist voluntario en soja GR. Glyphosate más clethodim a 30 g ai ha−1 brindó 75 a 92% de control de maíz Enlist voluntario a 1, 2, 4, y 8 semanas después de la aplicación del tratamiento (WAT) y redujo la densidad y el peso seco del maíz Enlist voluntario en 95 a 97%. Glyphosate más clethodim a 60 g ai ha−1 brindó 84 a 98% de control de maíz Enlist voluntario a 1, 2, 4, y 8 WAT y redujo la densidad y el peso seco del maíz Enlist voluntario en 97 a 99%. Glyphosate más sethoxydim a 150 g ai ha−1 brindó 66 a 86% de control de maíz Enlist voluntario a 1, 2, 4, y 8 WAT y redujo la densidad y el peso seco del maíz Enlist voluntario en 91 a 97%. Glyphosate más sethoxydim a 300 g ai ha−1 brindó 84 a 96% de control de maíz Enlist voluntario a 1, 2, 4, y 8 WAT y redujo la densidad y el peso seco del maíz Enlist voluntario en 96 a 98%. Glyphosate más fenoxaprop-p-ethyl, fluazifop-p-butyl, y quizalofop-p-ethyl aplicados POST brindaron 0 a 9% de control de maíz Enlist voluntario a 1, 2, 4, y 8 WAT y redujeron la densidad y el peso seco del maíz Enlist voluntario en 18 a 44%. Los rendimientos de la soja reflejaron estrechamente el nivel de control de maíz Enlist voluntario. Con base en estos resultados, los herbicidas cyclohexanedione, clethodim y sethoxydim, brindan un control adecuado del maíz Enlist voluntario en soja GR. En cambio, los herbicidas aryloxyphenoxypropionate, fenoxaprop-p-ethyl, fluazifop-p-butyl, y quizalofop-p-ethyl no brindan control de maíz Enlist voluntario en soja GR.

Keywords

ACCase, acetyl-CoA carboxylaseAAD-1, aryloxyalkanoate dioxygenase-1 transgenearyloxyphenoxypropionateclethodimcyclohexanedionefenoxaprop-p-ethylfluazifop-p-butylquizalofop-p-ethylsethoxydimcorn, Zea mays L.soybean, Glycine max (L.) Merr.Densitydry weightEnlist cornglyphosate-resistantplant standsoybeanvolunteer cornyield
Type
Research Article
Information
Weed Technology , Volume 29 , Issue 3 , September 2015 , pp. 374 - 379
Copyright
Copyright © Weed Science Society of America 

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