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

In the field studies conducted in Dayi County,Sichuan Province in 1993,30 species 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 pupal stage.The biology and habits of 7 natural enemy species were also introduced in this paper.