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First glyphosate-resistant weed confirmed in Canada

Researchers from the Canadian University of Guelph (Ontario) have confirmed findings of the first population of a glyphosate-resistant weed, the giant ragweed ( Ambrosia trifida) in Canada. Researchers began working with Monsanto Canada to confirm the emergence of a glyphosate-resistant A trifida biotype after it was first reportedly detected in 2008. The weeds have only been found in one field in Canada. As a precautionary measure, researchers are also checking the susceptibility of weed populations to glyphosate at other sites in south-western Ontario. Ten glyphosate-resistant weed biotypes, including A trifida, have been confirmed in the US, and a further seven species elsewhere in the world.

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