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Control of Volunteer Herbicide-Resistant Wheat and Canola1 : a journal of the Weed Science Society of America
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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 ++ 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, imidazolinone-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 ++ diuron, respectively. Treatments that contained glyphosate controlled imidazolinone- and glufosinate-resistant canola >84%% 14 DAT. By 21 DAT, control of imidazolinone- and glufosinate-resistant canola was 94 to 98%% with paraquat ++ diuron and all glyphosate treatments, except glyphosate––isopropylamine salt (IPA) ++ glufosinate (88 to 93%%) and glyphosate-IPA ++ paraquat (67 to 85%%). In these studies, paraquat ++ diuron was the best alternative to glyphosate for controlling volunteer herbicide-resistant wheat and canola.Nomenclature: Clethodim; diuron; glufosinate; glyphosate; imidazolinone; paraquat; quizalofop-P; canola, Brassica napus L. ‘‘DKL 27-20’’, ‘‘Phoenix’’, ‘‘Pioneer 45A71’’; wheat, Triticum aestivum L. ‘‘Bobwhite’’, ‘‘FS-4 IR’’.Additional index words: Direct seeding, glufosinate resistant, glyphosate resistant, green-bridge, imidazolinone resistant.Abbreviations: ACCase, acetyl coenzyme A carboxylase; DA, diammonium salt; DAT, days after treatment; HRC, herbicide-resistant crops; IPA, isopropylamine salt; PNW, Pacific Northwest.
RAINBOLT CURTIS R.
THILL DONALD C.
YOUNG FRANK L.
Weed technology 2004 07 v.18 no.3
Journal Articles, USDA Authors, Peer-Reviewed
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