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Herbicide-Resistant Canola (Brassica napus) Response and Weed Control with Postemergence Herbicides

Published online by Cambridge University Press:  20 January 2017

Timothy L. Grey ,
Paul L. Raymer  and
David C. Bridges
Timothy L. Grey*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Tifton Campus, 115 Coastal Way, P.O. Box 748, Tifton, GA 31794
Paul L. Raymer
Affiliation:
Crop and Soil Science Department, University of Georgia, Georgia Experiment Station, 1109 Experiment Street, Griffin, GA 30223
David C. Bridges
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Tifton Campus, 115 Coastal Way, P.O. Box 748, Tifton, GA 31794
*
Corresponding author's E-mail: tgrey@uga.edu
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Abstract

Field studies were conducted to evaluate weed control in herbicide-resistant canola in Georgia. The resistant canola cultivars and respective herbicides were ‘Pioneer 45A76’ and imazamox, ‘Hyola 357RR’ and glyphosate, and ‘2573 Invigor’ and glufosinate. Weed seed of Italian ryegrass and wild radish were sown simultaneously in October with canola and control of these species was evaluated along with other naturally occurring weeds. Herbicide treatments for the respective herbicide-resistant canola cultivar were imazamox at 0.035 and 0.071 kg ai/ha, glyphosate at 0.84 and 1.64 kg ae/ha, and glufosinate at 0.5 and 1.0 kg ai/ha. Herbicides were applied at one– two-leaf (LF) and three–four-LF canola stages. There was no significant injury to any canola cultivar as a result of herbicide rate or timing of application. By midseason (February), imazamox effectively controlled wild radish, henbit, and shepherd's-purse at both rates and at both timings. When applied to three–four-LF canola, the higher rates of glyphosate and glufosinate were required to provide 75% or greater control of Italian ryegrass, wild garlic, and henbit. Glufosinate did not adequately control wild radish at either rate or application timing. Greenhouse experiments provided similar results.

Keywords

Glufosinateglyphosateimazamoxhenbit, Lamium amplexicaule L. #3 LAMAMItalian ryegrass, Lolium multiflorum Lam. # LOLMUwild garlic, Allium vineale L. # ALLVIwild radish, Raphanus raphanistrum L. # RAPRAshepherd's-purse Capsella bursa-pastoris (L.) Medicus., # CAPBPand canola, Brassica napus L. # BRSNS, ‘Pioneer 45A76’, ‘Hyola 357RR’, and ‘2573 Invigor’Canola injurycanola yieldsusceptibility to herbicidesherbicide resistanceherbicide toleranceLF, leaf stage of growthDAP, days after plantingIRC, imidazolinone-resistant canola
Type
Research
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 551 - 557
Copyright
Copyright © Weed Science Society of America 

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