束管食螨瓢虫对猎物的选择反应

PREFERENCE OF Stethorus chengi Sasaji TO ITS PREYS

本文研究了束管食螨瓢虫 Stethorus chengi Sasaji 对桔全爪螨Panonychus citri McG.和桔始叶螨 Eotetranychus kankitus Ehara 各螨态以及若螨混合种群的选择捕食作用。结果表明,束管食螨瓢虫成虫喜吃两种猎物若螨;当两种若螨共存时,喜吃桔全爪螨。其喜好性与该种猎物的相对密度和总数有关。束管食螨瓢虫对两种猎物都有正转换行为,但对桔始叶螨的转换程度高于桔全爪螨。

An investigation was made of the preference of Stethorus chengi Sasaji to citrus red mite (Panonychus cirri MEG.) and citrus yellow mite (Eotetranychus kankitus Ehara) at va- rious developmental stages or to their mixed nymph population.The beetle showed prefer- once to the nymphs of either prey.When the two prey nymphs co-existed,the beetle had a positive switching to them and liked citrus red mite better.However,the switching of the beetle to citrus yellow mite was greater than to citrus red mite.Preferencc of the beetle was determined by the relative density and total density of the preys in the environment.