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''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 adult weevil is dark brown or black with light colored mottled hairs on its body. It is about 7-8 millimeters long. This weevil is native to Central and Eastern Europe. It was first accidentally introduced to the United States in the 1960s. The first published record is from Maryland in 1971.〔White, J. C. 1972. A European weevil, ''Larinus carolinae'' Oliver, collected in Maryland. Cooperative Economic Insect Report 22:418.〕 It was subsequently evaluated as a biocontrol agent in 1990 and redistributed across a wide range of the Great Plains and western States.〔 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. == References == * Coombs, E. M., et al., Eds. (2004). ''Biological Control of Invasive Plants in the United States''. Corvallis: Oregon State University Press, 429. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Larinus planus」の詳細全文を読む スポンサード リンク
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