杨盾蚧天敌种类及主要天敌自然控制效果调查

摘要

Species of natural enemies for Quadraspidiotus gigas which damaged the protection forest of the karamay farmland and their natural control effects were investigated .Investigation shows that :natural enemies for Quadras-pidiotus gigas are mainly Pteroptrix longiclava and Chilogorus geminus ;natural parasitism rate of Pteroptrix longiclava are 41 .5% .Predation of Chilogorus geminus (main predators of Quadraspidiotus gigas )indoors & den-sity functional response between Pteroptrix longiclava & Quadraspidiotus gigas were studied .The research dis-covers that :Chilogorus geminus have potential predator-prey for nymphs of Quadraspidiotus gigas ;looking effects of Chilogorus geminus on nymphs of Quadraspidiotus gigas decrease with the increase of prey density .%对克拉玛依农田开发区防护林上发生的杨盾蚧天敌昆虫种类及其自然控制作用进行了调查。调查发现，杨盾蚧天敌昆虫主要是长棒四节蚜小蜂和孪斑唇瓢虫，其中长棒四节蚜小蜂自然寄生率高达41．5％。此外，在室内对杨盾蚧的主要捕食性天敌孪斑唇瓢虫的捕食量以及孪斑唇瓢虫和杨盾蚧之间的密度功能反应进行了研究。研究发现，孪斑唇瓢虫对杨盾蚧若虫具有较大的捕食潜能，而且对若虫的寻找效应均随着猎物密度的增加而降低。