Bessa parallela; Zenillia dolosa; Brachymeria excarinata; Brachymeria lasus; ICHNEUMONIDAE-; LEPIDOPTERAN-HOSTS; Homona magnanima; Parasite prevalence & host pupal mortality; JAPAN-; Tokyo, Fuchu & Mizuho; Lepidopteran host pupal mortality & parasite prevalence Homona magnanima; DIPTERAN-PARASITES; Bessa parallela & Zenillia dolosa; HYMENOPTERAN-PARASITES; Brachymeria & Ichneumonidae; Pupal mortality & parasite prevalence survey; FUNGAL-DISEASES; Erynia radicans; VIRAL-DISEASES; Cytoplasmic polyhedrosis virus & entomopox virus; Pupal mortality cause; MORTALITY-; Pupal; JAPAN-; Tokyo, Fuchu & Mizuho; Pupal mortality, parasites & pathogens survey & prevalence The mortality of Homona magnanima pupae was investigated in tea gardens in Mizuho and Fuchu, Tokyo, Japan, in 1989-90. Two species of chalcids (Brachymeria lasus and B. excarinata), 6 species of icblneumonids (Itoplectis alternans spectabilis, Coccygomimus &sparis [Pimpla disparis], C. luctuosus [P. luctuosus], C. nipponicus [P. nipponicus], Agrothereutes lanceolatus and Scambus vulgaris), 2 species of tachinids (Zenillia dolosa and Bessa parallels) and an entomopathogenic fungus (Erynia radicans) were reared from the pupae collected from both sites. The ichnewnonid Phaeogenes sp., a cytoplasmic polyhedrosis virus and an entomopoxvirus were recorded only at Mizuho. The mortalities due to these factors changed with time and locality. The greatest mortalities caused by parasitic wasps, tachinids, E. radicans and viruses were 68.8%, 17.9%, 15.8% and 4.0%, resp. The species structure of the parasitoid complex differed among host generations. L alternans spectablilis and C. disparis were the major species in the overwintering generation, while B. lasus and B. excarinata were dominant from the lst to 3rd generations. none