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Hymenopterous parasites which emerged from the rice leaf roller collected in the paddy fields were investigated both in the early planting culture transplanted on May, 15 and in the normal season culture transplanted on June 21 in 1978. A total of six parasite species were found; they were Trichogramma sp., Trathala flavo-orbitalis, Bethylid sp., Apanteles sp., Itoplectis narangae and Brachymeria excarinata. An egg parasite, Trichogramma sp. emerged in mid-June in the early planting culture, and in early August and in the first half of September in the normal season culture. The parasitism was 21 % at its maximum in mid-September. A larval parasite, T. flavoorbitalis was a dominant species in the early planting culture and its parasitism varied from 34 to 54 % during late June to early July, whereas in the normal season culture it was 12 % at its maximum. Two other larval parasites, Bethylid sp. and Apanteles sp., were observed only in the normal season culture. The former emerged from late August to mid-October and the parasitism varied from 1 to 35 %, whereas the latter was very scanty. Both I, narangae and B. excarinata emerged from the pupae collected in the normal season culture during late September to late October. The maximum parasitism was 31 % in I. narangae and 11 % in B. excarinata in late October.

Hymenopterous parasites of the rice leaf roller, Cnaphalocrocis medinalis GUENEE, and their activities observed in the paddy fields of Chikugo