What Are the Most Efficacious Herbicides Applied Postemergence for Control of Multiple-Herbicide-Resistant Canada Fleabane [Conyza canadensis (L.) Cronq.] in Corn?

Multiple-herbicide-resistant (MHR) Canada fleabane [Conyza canadensis (L.) Cronq.] control has become a major concern for corn producers in Ontario. Postemergence (POST) herbicides are critical the of emerged MHR corn. A study that consisted five field experiments was conducted southwestern Ontario fields with confirmed to evaluate various herbicide mixtures applied POST Glyphosate + 2,4-D amine, glyphosate/2,4-D choline, glyphosate clopyralid, S-metolachlor/mesotrione/bicyclopyrone, tolpyralate atrazine, dicamba, dicamba/atrazine, S-metolachlor/mesotrione/ mesotrione bromoxynil S-metolachlor/ mesotrione/bicyclopyrone/atrazine, glyphosate/S-metolachlor/mesotrione glyphosate/dicamba tembotrione, tembotrione bromoxynil, and atrazine provided 63-99% control, 77-100% density reduction, 88-100% shoot biomass reduction interference reduced yield up 58%; all treatments resulted similar weed-free control. Results this indicate among evaluated most consistent