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| Knapweed Root Weevil ： ウィキペディア英語版 |
Cyphocleonus achates
''Cyphocleonus achates'' is a species of true weevil known as the knapweed root weevil. It is native to southern Europe and the Mediterranean and is used as an agent of biological pest control against noxious knapweeds, especially spotted knapweed (''Centaurea maculosa'').
== Life history ==
The adult weevil is dark gray and white speckled and 14 to 15 millimeters long. The female lays about 100 eggs during her 8- to 15-week adult lifespan. The eggs are deposited one by one in notches the female digs into the root crown of the knapweed. The larva emerges from the egg and tunnels into the root cortex where it feeds on the plant tissue. Sometimes a gall is produced in the feeding area. Adults feed on the leaves but it is the larva that does the most damage to the plant. Small plants can be killed by the larva's destruction of the root tissue. In their native range, most ''C. achates'' overwinter as 2nd instars, though in the introduced range, the vast majority overwinter as 1st instars.〔(【引用サイトリンク】 author = Janelle G. Corn, Jim M. Story, and Linda J. White )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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