KNAPWEED is a thistle-like plant accidentally introduced to N America in the late 1880s. With no natural enemies to keep it in check, it invaded different regions of the continent, including BC, where it has displaced native PLANTS and caused considerable environmental deterioration and economic loss to the CATTLE INDUSTRY. Over 600 sq km of the Interior is infested and the economic impact from lost hay production alone is estimated to be over $400,000 annually. As well, the widespread growth...

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