Abstract:To estimate parasitism performance of Trichogramma pintoi Voegele on Grapholita molesta (Busck), the parasitism and emergence rates of T.pintoi to eggs of G.molesta and Helicoverpa armigera (Hübner) were compared with Trichogramma dendrolimi Matsumura to the eggs of G.molesta under laboratory condition. The results indicated that parasitism rates of T.pintoi and T.dendrolimi to eggs of G.molesta had no significant differences. Emergence rates of T.pintoi and T.dendrolimi surviving to the adults after parasitizing the eggs of G.molesta had no significant differences. Parasitism rates of T.pintoi to eggs of G.molesta were significantly higher than that of T.pintoi to eggs of H.armigera. The proportion of T.pintoi and T.dendrolimi surviving to the adult’ emergence after parasitizing the eggs of G.molesta and H.armigera were no significantly different in the treatment of 15, 45, 60 and 75 eggs per tube. However, there were significant differences in the emergence rates of both wasps in the treatment of 30 and 90 eggs per tube. Parasitism of T.pintoi and T.dendrolimi to the eggs of G.molesta could accord with functional response disk equation of Holling-Ⅱ. These results indicated that T.pintoi could be a potential parasitic wasp to control G.molesta.