Integrated Weed Management Strategies for the Control of Herbicide-Resistant Weeds in Ontario

Lead Applicant: Isabelle Aicklen

Research Priority: Plant Health & Protection

Program Type: Tier 1

Funding Cycle: 2026/2027

Research Centre: Ontario Crops Research Centre - Ridgetown

Research Summary: Herbicide-resistant weeds, including common ragweed and glyphosate-resistant ryegrass, are major threats to soybean and corn production in Ontario. These weeds reduce yields, increase production costs, and limit effective herbicide options, especially in Identity Preserved (IP) soybean systems where herbicide use is restricted. This project will develop integrated weed management strategies that combine chemical, cultural, and mechanical approaches to improve weed control while reducing reliance on herbicides. Field trials will evaluate the timing and effectiveness of different herbicide programs, as well as the impact of practices like planting date and cover cropping. The goal is to identify practical, science-based solutions that maintain crop yields, support herbicide stewardship, and delay further resistance development. Results will be shared through targeted knowledge transfer activities to ensure rapid adoption. This project will help Ontario grain farmers manage resistant weeds more sustainably, improving the long-term productivity and environmental resilience of Ontario’s agri-food sector.