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The root weevil Cyphocleonus achates was introduced into western Montana in 1988 as a biological control agent against spotted knapweed (Centaurea maculosa), an exotic invasive weed from Eurasia. Spotted knapweed has declining in areas where C. achates was released, and experiments were conducted to evaluate the role this weevil may play in knapweed decline. Field experiments were conducted from 2001...