Biology and development of the Tachinid fly Zenillia dolosa (Meigen) (Diptera:Tachinidae) in host Mythimna separata (Walker)
2010
Giang, H.T.T., Ha Noi Univ. of Agriculture, Ha Noi (Vietnam) | Nakamura, S., Japan International Research Center for Agricultural Sciences, Tsukuba 305-8686 (Japan)
All tachinids are endo-parasitoids and important natural enemies of many lepidoptera spp. They have been used in many applied biological control programs worldwide. Zenillia dolosa Meigen (Diptera:Tachinidae) is an ovolar viparous parasitoid which lays incubated microtype eggs on the food plants of many lepidopteran pest species. This fly is a widespread gregarious parasitoid occurring throughout other Asian and European countries. Life history of this parasitoid was investigated in the laboratory on the host Mythimna separata (Lepidoptera:Noctuidae). Total developmental time from oviposition to adult emergence decreased as temperature increased from 15 to 30 deg C. Fecundity was highest at 20 deg C (1580.6 plus or minus 93.40 eggs per female) but was reduced at 30 deg C (892.7 plus or minus 146.2 eggs per female). Parasitoids successfully developed in 4th to 6th instar host larvae, host instar at time of parasitization significantly influenced the development of the immature parasitoid which was shorter as host instar increased. Both host mortality and parasitoid puparial weight were affected by the number of parasitoid eggs ingested per host:host mortality increased and puparial weight decreased when clutch size increased from 1 to 10 eggs per host.
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