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Control of volunteer herbicide-resistant wheat and canola

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Volunteer crops resistant to glyphosate and other herbicides pose a potential problem for Pacific Northwest (PNW) growers that rely on glyphosate for control of volunteer crops and weeds during fallow and before planting. Herbicides for control of volunteer herbicide-resistant wheat and canola in PNW conservation tillage systems were evaluated during 2000 and 2001 near Ralston, WA, and Moscow, ID. Paraquat 1 diuron controlled glyphosate- and imidazolinone-resistant wheat $90%, and glyphosate controlled imidazolinone-resistant wheat 88 to 96% 14 d after treatment (DAT). Glyphosate-and imidazolinone-resistant wheat were controlled only 58 to 85% with quizalofop-P and clethodim 14 DAT. By 21 DAT, idazolinone-resistant wheat control with clethodim and quizalofop-P was $93%, but the longer time period required for control to reach an acceptable level could increase disease and insect problems associated with volunteer wheat. Volunteer glyphosate-resistant canola was controlled 92 and 97% 14 DAT and 76 and 98% 21 DAT with paraquat and paraquat 1 diuron, respectively. Treatments that contained glyphosate controlled imidazolinoneand glufosinate-resistant canola >84% 14 DAT. By 21 DAT, control of imidazolinone- and glufosinate- resistant canola was 94 to 98% with paraquat 1 diuron and all glyphosate treatments, except glyphosate-isopropylamine salt (IPA) 1 glufosinate (88 to 93%) and glyphosate-IPA 1 paraquat (67 to 85%). In these studies, paraquat 1 diuron was the best alternative to glyphosate for controlling volunteer herbicide-resistant wheat and canola.
Rainbolt, C.R. , Thill, D.C. , Young, F.L.
Includes references
Weed technology : a journal of the Weed Science Society of America 2004 July-Sept, v. 18, no. 3
The Society
Journal Articles, USDA Authors, Peer-Reviewed
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