Racing against resistance — managing multiple herbicide-resistant Canada fleabane

Glyphosate-resistant Canada fleabane was first confirmed in Ontario in 2010. Fast-forward thirteen years and the weed now has developed resistance to multiple herbicide groups and can be found in Essex County, bordering Michigan, all the way east to Glengarry County, adjacent to the Quebec border. University of Guelph weed scientist Dr. Peter Sikkema has been…