交信撹乱剤設置茶園におけるハマキガ類の幼虫寄生蜂の寄生状況

抄録

Percentages of parasitism and species composition of the parasitoids on the larvae of the smaller tea tortrix, Adoxophyes honmai Yasuda, and the oriental tea tortrix, Homona magnanima Diakonoff (Lepidoptera: Tortricidae), in commercial tea fields treated with the mating disruptant (tortorilure) were investigated in Shizuoka Prefecture from 2007 to 2008. The parasitoids species emerged from larvae of A. honmai were Ascogaster reticulata Watanabe, Apanteles adoxophyesi Minamikawa, Campoplex homonae (Sonan) and Temelucha sp. Among the parasitoides A. reticulate was the primary dominant species, and a predaceous gall midge, Lestodiplosis sp. was also found on the fourth generation of hosts. Percentages of parasitism of the parasitoid complex changed from about 30 to 80% and the percentages in fields treated with the mating disruptant showed a higher trend than an insecticide applied field. A few species of parasitoids emerged from the larvae of H. magnanima, the dominant species of them was C. homonae. Percentages of parasitism of these were kept less than about 5% in all of the fields.