Prey aphid inhibits development and reproduction of Coccinella septempunctata bruckii and Propylea japonica (Coleoptera: Coccinellidae) but maintains adults
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We compared the development and survival of Coccinella septempunctata bruckii Mulsant and Propylea japonica (Thunberg) raised on Uroleucon nigrotuberculatum (Olive) with those of the same species raised on Megoura crassicauda Mordvilko. Uroleucon nigrotuberculatum significantly prolonged the development time and drastically reduced the survival of the larval stages of both predators. Adult body weight of C. septempunctata and females of P. japonica raised on M. crassicauda was substantially heavier. No females of C. septempunctata raised on U. nigrotuberculatum laid eggs. Only 15 % of C. septempunctata females collected from Solidago altissima L. patch laid eggs for 48 h when fed on U. nigrotuberculatum. In contrast, females fed on M. crassicauda were highly fecund. Some P. japonica females raised on U. nigrotuberculatum laid a few eggs discontinuously for a short period. Approximately 90 % of P. japonica adult females collected from the solidago patch and fed on U. nigrotuberculatum laid a few eggs, but females fed on M. crassicauda laid substantially more eggs. These results suggest that patches of the introduced plant solidago, a natural host of the introduced aphid, U. nigrotuberculatum, are not adequate habitats for reproduction but may provide lady beetle adults with alternative prey on which to survive when suitable prey are scarce.
KeywordsLady beetle Megoura crassicauda Prey aphid Solidago Uroleucon nigrotuberculatum
We are grateful to the members of applied entomology laboratory of University of Miyazaki for their kind cooperation. We thank two anonymous reviewers for the valuable comments on our manuscript.
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