Effect of Three Species of Predatory Ladybirds on Oviposition of Aphid Parasitoids

概要

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The effect of three species of aphidophagous ladybirds, Coccinella septempunctata, Harmonia axyridis, and Propylea japonica, on oviposition of an aphid parasitoid, Aphidius colemani, was assessed in the bean aphid, Aphis craccivora, in relation to physical presence, visual cues or larval tracks of ladybirds. Female parasitoids responded to the presence of a ladybird larva by reducing the number of eggs laid in the patch, but visual cues of larvae did not affect the oviposition. Effect of larval tracks on parasitism was selective among species ; C. septempunctata larval tracks significantly reduced parasitism, but the same was not true for the larval tracks of H. axyridis and P. japonica. As parasitized aphids are also at risk of predation by predatory ladybirds, therefore, it is advantageous for female parasitoids to avoid aphid patches which contain these predators. Significance of such an oviposition response is also discussed.
日本昆虫学会の論文
2000-09-25