蠋蝽对榆绿毛萤叶甲的室内捕食反应

Functional responses of Arma chinensis preying on Pyrrhalta aenescens in laboratory

榆绿毛萤叶甲Pyrrhalta aenescens是呼和浩特市危害园林植物较重的害虫之一,长期危害榆树Ulmus pumila。为有效控制其危害,提高呼和浩特市园林绿色防控技术水平,通过室内试验,研究蠋蝽对榆绿毛萤叶甲的捕食反应,功能反应数据用HollingⅡ方程进行模拟。结果表明:蠋蝽2~5龄若虫及成虫对榆绿毛萤叶甲3龄幼虫和成虫的捕食模型均符合HollingⅡ模型;随着猎物密度增加,蠋蝽的捕食量逐渐增加,搜寻效应降低;蠋蝽5龄若虫控害效果最好。

Pyrrhalta aenescens is a kind of important defoliators which damages elm trees for a long time in Huhhot.In order to prevent and control it effectively,predatory effect of Arma chinensis Fallou against P.aenescens was studied in laboratory.The results showed that from 2 rd to 5 th instar nymphs and adults of predator exhibited HollingⅡfunctional responses.The predation number of A.chinensis increased with the increase of P.aenescen density.With the increase of P.aenescen density,predator′s searching efficiency decreased gradually,and the searching efficiency of 5 th instar nymph was obviously higher than that of other stages.