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Weed Management Programs in Glufosinate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Jason T. Beyers ,
Reid J. Smeda  and
William G. Johnson
Jason T. Beyers
Affiliation:
Agronomy Department, University of Missouri, Columbia, MO 65211
Reid J. Smeda*
Affiliation:
Agronomy Department, University of Missouri, Columbia, MO 65211
William G. Johnson
Affiliation:
Agronomy Department, University of Missouri, Columbia, MO 65211
*
Corresponding author's E-mail: smedar@missouri.edu.
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Abstract

Field trials were conducted at two sites in both 1997 and 1998 to evaluate soybean response and weed control with glufosinate alone or combined with quizalofop, lactofen, imazethapyr, flumiclorac, or bentazon plus acifluorfen in narrow-row, glufosinate-resistant soybean. Soybean injury ranged from 0 to 21% at 2 wk after treatment (WAT) and from 0 to 5% by 4 WAT. Glufosinate alone at 0.29 and 0.4 kg ai/ha controlled velvetleaf, common waterhemp, common ragweed, morningglory species, and giant foxtail greater than 85% in all studies. Mixtures containing glufosinate and other herbicides controlled these species greater than 81% but did not improve control over glufosinate alone. Estimates of weed biomass closely reflected visual control evaluations. However, giant foxtail biomass was higher for mixtures of glufosinate plus lactofen, flumiclorac, or bentazon and acifluorfen, indicating possible antagonism of glufosinate activity. At both locations, soybean yields were similar among most treatments, but that of the glufosinate plus lactofen treatment was lower when compared with other treatments. Additional trials evaluated soybean response and weed control with a preemergence herbicide followed by glufosinate postemergence (POST), glufosinate applied once or twice POST, and mixtures of glufosinate plus imazethapyr or flumiclorac POST in wide-row soybean. Glufosinate applied twice controlled common waterhemp, morningglory species, prickly sida, common cocklebur, and giant foxtail up to 39% greater than did glufosinate applied once. The addition of imazethapyr, but not flumiclorac, to glufosinate improved weed control when compared with glufosinate alone.

Keywords

Acifluorfenbentazonflumicloracglufosinateimazethapyrlactofenquizalofopcommon cocklebur, Xanthium strumarium L. #3 XANSTcommon ragweed, Ambrosia artemisiifolia L. # AMBELcommon waterhemp, Amaranthus rudis Sauer # AMATAgiant foxtail, Setaria faberi Herrm. # SETFAmorningglory species, Ipomoea spp. # IPOSSprickly sida, Sida spinosa L. # SIDSPvelvetleaf, Abutilon theophrasti Medik. # ABUTHsoybean, Glycine max (L.) Merr. ‘Asgrow 2704 LL’Herbicide mixturesherbicide-resistant cropsoybean injuryCOC, crop oil concentrateEPOST, early postemergenceLPOST, late postemergenceMPOST, midpostemergencePOST, postemergencePRE, preemergenceWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 267 - 273
Copyright
Copyright © Weed Science Society of America 

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