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Confirmation of Trifluralin-resistant Green Foxtail (Setaria viridis) in Manitoba

Published online by Cambridge University Press:  12 June 2017

Ian N. Morrison ,
Barry G. Todd  and
Ken M. Nawolsky
Ian N. Morrison
Affiliation:
Dep. Plant Sci., Univ. Manitoba
Barry G. Todd
Affiliation:
Weeds Sect., Manitoba Agric.
Ken M. Nawolsky
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
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Abstract

Dose-response experiments showed that three samples of green foxtail collected from fields in southern Manitoba where trifluralin had not controlled the weed in 1987 were resistant to the herbicide. GR50 values indicated that the resistant populations were about 5 times more resistant to trifluralin than susceptible populations, about twice as resistant as wild oat, and about equally resistant as wheat. An additional 33 samples collected in 1988 from southwestern Manitoba where trifluralin has been used for nearly 20 yr in both cereal and oilseed crops were resistant to trifluralin.

Keywords

Trifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminegreen foxtail, Setaria viridis (L.)Beauv. ♯3 SETVIwild oat, Avena fatua L. ♯ AVEFAspring wheat, Triticum aestivum L. ‘Katepwa’Brassica campestrisBrassica napusTriticum aestivumherbicide resistanceSETVI
Type
Feature
Information
Weed Technology , Volume 3 , Issue 4 , December 1989 , pp. 544 - 551
Copyright
Copyright © 1989 by the Weed Science Society of America 

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