Larinus planus is a species of true weevil. It is used as an agent of biological pest control against the noxious weed Canada thistle (Cirsium arvense). The name has been recently changed to Larinus carlinae.
The adult weevil is dark brown or black with light colored mottled hairs on its body. It is about 7-8 millimeters long.
In 2000, it was found feeding on Cirsium undulatum var. tracyi, a sparsely distributed thistle native to western Colorado and eastern Utah. Subsequent research determined that the weevil reduced seed production of the native thistle.
- White, J. C. 1972. A European weevil, Larinus carolinae Oliver, collected in Maryland. Cooperative Economic Insect Report 22:418.
- Louda and O'Brien (2002). "Unexpected Ecological Effects of Distributing the exotic weevil Larinus planus (F.) for the Biological Control of Canada Thistle" (PDF). Conservation Biology.
- Coombs, E. M., et al., Eds. (2004). Biological Control of Invasive Plants in the United States. Corvallis: Oregon State University Press, 429.
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