Waterhemp - resistant populations (Jan 2023)

Ontario counties where herbicide resistant waterhemp have been identified. 18 counties have herbicide resistant waterhemp. All populations of waterhemp are resistant to multiple herbicide groups.

The 18 Ontario counties where herbicide resistant waterhemp have been identified (January 2023).

Common ragweed - resistant populations (April 2023)

Ontario counties where herbicide resistant common ragweed have been identified. 25 counties have herbicide resistant common ragweed.

The 25 Ontario counties where herbicide resistant common ragweed have been identified (April 2023).