Parasitism byEphedrus cerasicola [Hym.: Aphidiidae] developing in different stages ofMyzus persicae [Hom.: Aphididae] |
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| Authors: | Eline B Hågvar T Hofsvang |
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| Institution: | (1) Department of Zoology, Agricultural University of Norway, P.O. Box 46, N-1432 Aas-NLH, Norway;(2) Department of Entomology, Norwegian Plant Protection Institute, P.O. Box 70, N-1432 Aas-NLH, Norway |
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| Abstract: | The parasitoidEphedrus cerasicola Stary oviposited in the 4 nymphal instars and in newly moulted apterous adults ofMyzus persicae (Sulzer). Development and reproduction of unparasitized and parasitized aphids at 21°C were compared. Unparasitized aphids developed to adults in 6.5 days and started to reproduce after 7 days. Longevity varied between 7 and 42 days. Net reproductive rate (R0) was 40.7. In contrast to older nymphs, aphids parasitized in the 1 st instar almost never reached the adult stage before mummification. Aphids parasitized in 2nd, 3rd and 4th instar and as newly moulted adults produced respectively 0.07 %, 2 %, 23 % and 32 % of offspring produced by unparasitized aphids. Corresponding reproductive periods were 1, 1.4, 3 and 4 days. Host age at parasitization had a slight effect on the parasitoid's developmental rate and had no effect on egg or pupal survival, or on the sex ratio of the emerging parasitoids. |
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| Keywords: | Aphid parasitoid interaction aphid instars aphid development and reproduction parasitoid develoment Myzus persicae Ephedrus cerasicola Aphidiidae |
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