Triple-resistant kochia [Kochia scoparia (L.) Schrad.] in Alberta

Abstract

A randomized stratified survey was conducted in Alberta in 2017 to determine the distribution and abundance of multiple-resistant (acetolactate synthase (ALS) inhibitor, glycine, synthetic auxin) kochia. All populations were ALS inhibitor-resistant, with glyphosate and dicamba resistance confirmed in 50 and 18% of populations, respectively. Ten percent of populations exhibited resistance to all three site-of-action herbicides.