コスジオビハマキの寄生性昆虫

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Choristoneura diversana was known as a defoliator of deciduous trees in Europe and Japan, but several out breaks of this species have occurred on mature plantations of todo-fir in Hokkaido since 1965. Investigations of the parasites of the Tortricid in young and mature plantations and a natural forest cf todo-fir in central Hokkaido being conducted since 1965 revealed that of 46 species obtained 23 were Ichneumonid, 6 Braconid, 10 Chalcid, and 7 Tachinid. Cephaloglypta laricis MOMOI was the dominant larval parasite in stands of high host densities, its parasitism ranging from 5 to 30%, whereas Lissonota sp. was dominant in stands of low host densities, its parasitism sometimes reaching 60% in natural forests or young plantations. Parasitism in the pupal stage ranged from 5 to 48%. Coccygomimus turionellae L., C. disparis VIERECK, and Dirophanes yezoensis UCHIDA were the most common pupal parasites. Although most of the parasites were associated with other Tortricids on todo-fir, 4 species, i.e., C.laricis, Lissonota sp., Meteorus sp., and D.yezoensis, had an exclusive preference for C.diversana. On larch, however, these parasites except for Meteorus sp. parasitized Ptyholomoides aeriferana H.-S., the biology of which is very similar to that of C.diversana. As a result the parasite complexes of both Tortricids showed a similar structure. When the specialized parasites of C.diversana, the spruce budworm, Choristoneura fumiferana, and the European fir budworm, C.murinana, are compared, Lissonota sp. is apparently a counterpart of Apanteles fumiferanae and A.murinanae. Meteorus sp., which was usually the next most numerous larval parasite, seems to have no counterparts in the parasite complexes of both foreign budworms. It seems likely that these differences in the specialized parasites have resulted from the phylogenetic difference of C.diversana.
日本応用動物昆虫学会の論文
1973-06-25

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上条一昭
北海道立林業試験場

コスジオビハマキの寄生性昆虫

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