Rapid increase in glyphosate resistance and confirmation of dicamba-resistant kochia (<i>Bassia scoparia</i>) in Manitoba

Increased adoption of crops with stacked traits conferring glyphosate and dicamba resistance, recent confirmation kochia [Bassia scoparia (L.) A.J. Scott] biotypes resistant to these herbicides in Alberta Saskatchewan, warrant surveillance herbicide-resistant Manitoba. A randomized–stratified survey 315 sites Manitoba was conducted the fall 2018. Overall, 58% populations tested were glyphosate-resistant, while 1% dicamba-resistant. This documents rapid increase glyphosate-resistant over a five-year time frame, also confirms first cases resistance alone combination resistance.