Digging into Research
The reduction of crop yield and quality, and the increase in additional weed management expenditures were estimated to cost Manitoba farmers $77 million annually. The confirmation of herbicide-resistant weeds continues to grow in Manitoba, across the Prairies, and worldwide. As of 2025 in Canada, 77 herbicide-resistant...
Early maturing crop rotations that included winter wheat had reduced wild oat populations compared to normal or late maturing rotations. This was likely because of increased crop competitiveness, rotational diversity and possibly harvest weed seed control. The evolution of herbicide-resistant wild oats has made wild oat...
A flax rotation that included 3 years of alfalfa with reduced herbicide applications provided similar wild oat and cleaver control as a flax-barley-flax-oat rotation with recommended herbicide applications. Including 2 successive winter cereal crops in a 5 year rotation also improved wild oat control. Wild oat...
Herbicide screening studies on triallate-resistant (Group 8) wild oats found cross-resistance to Group 1 and Group 2 herbicides. Additionally, unexpected resistance to Group 14 and Group 15 herbicides was found even though the wild oats had never been previously exposed to these herbicides. Two relatively new...
Agriculture and Agri-Food Canada research scientists Hugh J. Beckie and K Neil Harker identified herbicide-resistant weed management practices that have the most impact on managing herbicide selection pressure. Their top 10 management practices are based on research and growers’ experiences over the last 30 years....
