The house fly, Musca domestica L. is a serious cosmopolitan pest in livestock production systems. Poultry farmers employ various techniques to control them but rely heavily on the use of chemicals which has the serious drawback of the target pest becoming resistant. We have selected two native natural enemies in Gyeonggi area where selected for the biological control of the house fly. Carcinops pumilio (Erichson) (Coleoptera: Histeridae), commonly found in poultry manure, is an important predator of house fly eggs and larvae. The substitute food source was developed for the mass rearing of C. pumilio. Spalangia nigroaenea (Hymenoptera: Pteromalidae) not only parasitized the host to produce its progeny but also killed host pupae by feeding. The parasitoid induced mortality had an effect on the parasitoid-to-host density relationships.

• young su Lee(Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services)
• hyun ju Lee(Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services)
• jae woon Chung(Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services)
• hee a Lee(Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services)
• seung ho Kang(Korea Beneficial Insects Laboratory Co. ltd.)
• chang sung Kang(Korea Beneficial Insects Laboratory Co. ltd.)