Waterhemp - resistant populations (Dec 2023)

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

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

Number of waterhemp fields by county and district that are resistant to single and multiple modes of action. 

Number of fields with herbicide resistant waterhemp by county (as of Dec 2023)

Number of fields with herbicide resistant waterhemp by county (as of Dec 2023)

Breakdown of waterhemp populations by what herbicide group they were resistant to.

Breakdown of herbicide resistant waterhemp populations in Ontario by herbicide group (as of Dec 2023).

Breakdown of herbicide resistant waterhemp populations in Ontario by herbicide group (as of Dec 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).