Ecological Studies on Anagrus incarnatus Haliday (Hymenoptera : Mymaridae), an Egg Parasitoid of the Rice Planthoppers : I. Functional Response to Host Density and Mutual Interference

Chantarasa-ard Sujin, 平嶋 義宏, 三浦 正

doi:10.5109/23794

Ecological Studies on Anagrus incarnatus Haliday (Hymenoptera : Mymaridae), an Egg Parasitoid of the Rice Planthoppers : I. Functional Response to Host Density and Mutual Interference

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Chantarasa-ard Sujin

Entomological Laboratory, Faculty of Agriculture, Kyushu University
平嶋義宏

九州大学農学部農学科昆虫学講座
三浦正

島根大学農学部環境保全学科昆虫管理学研究室

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説明

The functional response to host density and mutual interference of an egg parasitoid, Anagrus incamatus Haliday, parasitizing eggs of Nilaparvata Zagem (Stal) were analysed. The behavioural response to varying host egg densities of this parasitoid was found to be fitted the Helling’s Type II functional response. By utilizing the Holling’s (1959) method, the handling time (Tn) and searching efficiency (a) were evaluated. This parasitoid was also found to possess some degree of mutual interference (m), follwing the Hassell and Varley’s (1969) model. In addition, ohservation on the sex ratio of the parasitoid’s progeny, with respect to the host egg and searching parasitoid densities available in the present study, showed that its ratio was rather constant, the females usually outnumbered the males, about 2 or 3 to 1.

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Journal of the Faculty of Agriculture, Kyushu University

Journal of the Faculty of Agriculture, Kyushu University 29 (1), 59-66, 1984-09

Faculty of Agriculture, Kyushu University