Abstract
Rhinocyllus conicus (Froelich), a weevil introduced into the Gallatin Valley for biocontrol of musk thistle, was found to also infest 3 related species, Canada, bull, and wavy-leaved thistles. High weevil infestations within seed heads, reduced seed production, and reduced seedling density all indicated a strong suppressing effect on the musk thistle population.

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