四川省大邑县舞毒蛾天敌的研究

Studies on the Natural Enemies of Gypsy Moth,Lymantria dispar(Lep. :Lymantriidae )in Dayi,Sichuan Province

１９９３年在大邑县共收集到舞毒蛾天敌３０种，其中寄生性昆虫１９种，捕食性昆虫９种，病毒和虫霉菌各１种。卵期平均寄生率为２７．０６％±０．５４％，大蛾卵跳小蜂是主要天敌。幼虫期天敌有病毒、斑痣悬茧蜂、毒蛾镶颚姬蜂和绒茧蜂等，平均杀死幼虫５１．５９％±６．４８％。蛹期主要天敌有寄蝇、广大腿小蜂和脊腿囊爪姬蜂等，平均寄生率达３２．９１％±２６．４０％。在舞毒蛾卵－蛹期，累计约有８７．６２％的个体被天敌致死。

In the field studies conducted in Dayi County,Sichuan Province in 1993,30species of the natural enemies of gypsy moth Lymantria dispar were collected,including 19 parasitoids,9 predators,one NPV and one fungus Entomophaga maimaiga. 3 of them were natural enemies in egg stage,the egg-parasitic wasps can make a parasitism of 27.06%±0.54%in average,Ooencyrtus kuwanae was the dominant one. 13 of them were parasitoids in larval stage,the dominant species of Meteorus pulchricornis,Hyposoter vierecki,Glyptapan-teles liparidis and NPV can kill the larvae with a proportion of 51.59%±6.48%in average,NPV was the most important one in this stage. Tachinid maggots parasitized a lot of gypsy moth larvae, which came out from larvae with a percentage of 26.5%and from pupae 73.5%.There were 4 kinds of parasitoids in the pupal stage with a parasitism of 32.91%±26.40%in average,which are tachinids,Brachymeria lasus,Thqeronia atalantae gestator etc. About 87.62%of the gypsy moth individuals were killed by natural enemies from egg to pu-pal stage. The biology and habits of 7 natural enemy species were also introduced in this pa-per.