Abstract
Hyperparasitism of Neochrysocharis formosa (Westwood) on the primary parasitoid, Diglyphus isaea Walker, of Liriomyza trifolii (Burgess) was observed in a greenhouse of tomato plants where D. isaea was released. The percentage of the indigenous parasitoid, N. formosa, in the parasitoid complex emerged from L. trifolii larvae increased with time during June and July. Parasitism by N. formosa increased to 100% about two months after the first release of D. isaea. In this time, most of D. isaea larvae were hyperparasitized by endoparasites. All parasitoids emerged from D. isaea larvae were females of N. formosa. Body size of N. formosa emerged from D. isaea larvae was significantly smaller than ones which were emerged from L. trifolii larvae.
