Larinus minutus (image) University of British Columbia Caption This is a photo of Larinus minutus, a weevil introduced to combat the invasive diffuse knapweed in western North America. The effectiveness of the weevil and other biological agents may be reduced when species combinations work against each other. Credit UBC Science Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.