]*>","")" /> Selective Effects of Two Predatory Natural Enemies on Cotton Pests and Their Eggs
Xinjiang Agricultural Sciences

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Selective Effects of Two Predatory Natural Enemies on Cotton Pests and Their Eggs

  • Received:2002-03-25 Revised:2002-03-25 Online:2002-03-25 Published:2002-03-25

两种捕食性天敌对棉虫及卵的选择效应

马江;何玉琳;刘小林;刘科雨;邢海业;王爱莲;王江平   

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摘要： 系统阐述了我区两种捕食性天敌的优势种瓢虫和草蛉对棉田害虫的选择效应,通过选择效应分析表明:在棉蚜、棉铃虫幼虫、棉铃虫卵之间,瓢虫成虫、幼虫、草蛉幼虫均对棉蚜表现出明显的选择嗜好.在三者猎物组配中,不同的试验组合模式下存在着不同的转换效应,结果为对猎物高密度下的捕食量显著高于低密度下的捕食量,其选择性指数D＞1,Manly指数显著大于1,选择程度依次为棉蚜＞棉铃虫卵＞棉铃虫幼虫.