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Vergleichende Untersuchungen zur Eignung von Aphelinus asychis Walker und Aphelinus varipes Foerster (Hym., Aphelinidae) fuer die biologische Bekaempfung von Aphis gossypii Glover (Hom., Aphididae)


Vergleichende Untersuchungen zur Eignung von Aphelinus asychis Walker und Aphelinus varipes Foerster (Hym., Aphelinidae) fuer die biologische Bekaempfung von Aphis gossypii Glover (Hom., Aphididae)



Mitteilungen der Deutschen Gesellschaft fuer Allgemeine und Angewandte Entomologie i; 15: 289-293



The cotton aphid is a phytophagous cosmopolitan species and an important pest on cucumber in European greenhouses. Because of increased insecticide resistance and destruction of natural enemies through the use of pesticides current research is directed towards the development of management. systems that use biological control methods. The present laboratory study was designed to compare two aphelinids, Aphelinus asychis WALKER and Aphelinus varipes FOERSTER, according to some life table characteristics parasitizing the cotton aphid, Aphis gossypii GLOVER. The traits studied were developmental time, adult emergence rate, host feeding and parasitization. The results showed that both species were able to complete their development with exclusively this host. Moreover, they can host feed and parasitize successfully on A. gossypii-nymphs. Developmental duration from egg to mummification and from mummification to emergence of adults were 7,1 days and 6,9 days for A. asychis and 9,1 days and 10,3 days for A. varipes, respectively. Adult emergence rates were higher for A. asychis (75%) than for A. varipes (53%). Comparison of the impact on A. gossypii of both parasitoids indicated that A. asychis was more effective than A. varipes. In total A. asychis killed an average of 17,1 and A. varipes an average of 4,8 A. gossypii-nymphs/day. Consequently, A. asychis seems to be a promising natural enemy which could contribute to a successful biological control program for A. gossypii. However, its biology, ecology and control efficiency need further information.

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Related references

Comparative studies on the suitability of two aphelinids, Aphelinus asychis Walker and Aphelinus varipes Foerster Hym, Aphelinidae, for the biological control of Aphis gossypii Glover Hom, Aphididae Vergleichende Untersuchungen zur Eignung von Aphelinus asychis Walker und Aphelinus varipes Foerster Hym, Aphelinidae fuer die biologische Bekaempfung von Aphis gossypii Glover Hom, Aphididae. Mitteilungen der Deutschen Gesellschaft fuer Allgemeine und Angewandte Entomologie. Juli; 15: 289-293, 2006

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