Parasitic Efficiency Of Trichogramma Pintoi Voegele (Hy-Menoptera: Trichogrammatidae) On Grapholita Molesta(Busck)(Lepidoptera: Tortricidae)

Grapholita molesta (Busck) was a kind of cosmopolitan fruit tree pest insect, dis-tributed widely in China. It could seriously influence the fruit quality if not well con-trolled. Trichogrammatidae was extensively used in Lepidoptera and other kinds ofpest biological control as an important eggs parasitism enemy which spread over theworld. In order to take advantage of Trichogrammas to control G. molesta, parasitismefficiency of Trichogramma pintoi Voegele on eggs of G. molesta was studied underlaboratory conditions, comparing with Trichogramma dendrolimi Matsumura and targetpest, Helicoverpa armigera Hübner of T. pintoi, to evaluate whether T. pintoi could beused to control G. molesta. At the same time, laboratory conditions supplied to rear T.pintoi were researched to optimize breeding conditions. The results showed that para-sitism ability of T. pintoi in laboratory was preferable and the parasitism function couldfit Holling Ⅱ type of function response model. The parasitism rate and emergencerate after successfully parasitized the eggs of G. molesta of T. pintoi and T. dendrolimiwere not significantly different. As eggs density of G. molesta increasing, the parasit-ism rate of both Trichogramma presented a descending trend. When the target host, H.armigera eggs were parastitized by T. pintoi, the parasitism rate was significantlylower than eggs of G. molesta. As the eggs density increasing, the parasitism rate of T.pintoi on H. armigera emerged as linear quadratic, and the emergence rate changedlittle. Ultraviolet radiation, host eggs age, photoperiod, exposure time, host eggs den-sity and wasp density could affect the parasitism efficiency of T. pintoi on eggs of G.molesta in a large degree. The ultraviolet intensity and treatment time used to kill G. molesta eggs influence the parasitism rate and emergence rate of T. pintoi. There wererespectively significant differences in parasitism rate when various host eggs age, ex-posure time, host eggs density and wasp density were supplied. However, the emer-gence rate did not vary very much. The parasitism rate and emergence rate were notchanged a lot when various photoperiods supplied. Biological control of G. molestausing T. pintoi needed to be further study.