Science. 1986 Jun 13;232(4756):1408-10. doi: 10.1126/science.232.4756.1408.
Beetles secrete an array of chemicals generally believed to mitigate attack by predators. Methylcyclopentanoid monoterpenes secreted by larvae of the willow leaf beetle, Plagiodera versicolora, deter feeding by conspecific adults. Furthermore, the secretion elicits a strong repugnancy response in larvae of another willow herbivore, Nymphalis antiopa. Leaves bearing beetle larvae are less likely than leaves not bearing beetles to be frequented and consumed by Nymphalis larvae. Predator defense may not be the sole function of glandular secretions produced by herbivorous insects; secretions may also mediate interactions among herbivores that use a common resource.
甲虫会分泌一系列的化学物质，这些物质通常被认为可以减轻被捕食者攻击的风险。柳树叶甲幼虫分泌的甲基环戊烷单萜能阻止同种成虫取食。此外，这种分泌物会引起另一种柳科食草昆虫——欧洲银纹夜蛾幼虫的强烈厌恶反应。有甲虫幼虫的叶子比没有甲虫的叶子更不容易被欧洲银纹夜蛾幼虫光顾和食用。腺体分泌物对食草昆虫的防御作用可能不仅仅局限于抵御捕食者；分泌物也可能调节以共同资源为食的食草动物之间的相互作用。
