Effect of parasitism byAscogaster reticulatus [Hym.: Braconidae] on growth of the host,Adoxophyes sp. [Lep.: Tortricidae] |
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Authors: | Y Ohnuma Y Kainoh |
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Institution: | (1) Laboratory of Applied Entomology, Tokyo University of Agriculture and Technology, Fuchu, 183 Tokyo, Japan;(2) Institute of Agriculture and Forestry, University of Tsukuba, 305 Tsukuba, Ibarak, Japan;(3) Present address: Nogeyama Zoological Gardens, Oimatsu-cho, Nishi-ku, 220 Yokohama, Japan |
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Abstract: | The developmental interaction between the egg/larval parasitoid,Ascogaster reticulatus Watanabe (Hymenoptera: Braconidae) and its host,Adoxophyes sp. (Lepidoptera: Tortricidae) was examined. Prior to the egress of a final-instar parasitoid larva from the 4th-instar host larva, host weight decreased by 22% from the maximum weight. The final body weight of a host larva was 27% of
the maximum weight of a healthy 5th-instar host. Food consumption was significantly reduced in both 3rd-and 4th-instar parasitized larvae compared with healthy ones. In the 4th instar, a parasitized larva consumed 28% less artificial diet and produced less frass than a healthy larva. The growth rate
of the endoparasitoid larvae greatly increased after their host's molt to the 4th instar. Parasitoid larval volume increased 40 fold in the 4th-instar host.
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Keywords: | Ascogaster reticulatus Hymenoptera Braconidae host regulation growth |
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