Recent confirmation of dicamba-resistant kochia [Bassia scoparia (L.) A.J. Scott] in Alberta warrants investigation of resistance to other commonly used synthetic auxin herbicides like fluroxypyr. A randomized-stratified survey of 305 sites in Alberta was conducted in 2017 to determine the status of fluroxypyr-resistant kochia. Overall, 13% of the kochia populations were fluroxypyr-resistant. Only 4% of the populations were both fluroxypyr- and dicamba-resistant, indicating that different mechanisms may confer resistance to these herbicides. When combined with estimates of dicamba resistance, about 28% of the kochia populations sampled in Alberta in 2017 were resistant to at least one synthetic auxin herbicide.
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23 June 2021
Fluroxypyr-resistant kochia [Bassia scoparia (L.) A.J. Scott] confirmed in Alberta
Charles M. Geddes,
Teandra E. Ostendorf,
Mallory L. Owen,
Julia Y. Leeson,
Shaun M. Sharpe,
Scott W. Shirriff,
Hugh J. Beckie
auxine synthétique
enquête
Herbicide resistance
Kochia scoparia
Kochia scoparia
résistance aux herbicides
surveillance