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Aphidius granarius, Marsh., in Relation to its Control of Myzus kaltenbachi, Schout

Published online by Cambridge University Press:  10 July 2009

Don R. Arthur
Don R. Arthur
Affiliation:
Department of Agricultural Zoology, University College, Cardiff.
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Extract

1. Aphidius granarius is an internal parasite of Myzus kaltenbachi, where the latter is found infesting corn crops in South Wales.

2. The emergence of the adult parasite is described. Mating takes place within two hours of emergence, the females may be mated with more than one male.

3. A brief description of the morphology of the egg, larval, prepupal and pupal stages is given.

4. The rate of reproduction of the females of A. granarius is high, with female: male as 12·9: 10. Unmated females always produce males.

5. The adult parasite under normal conditions lives for 21–27 days and flies readily under favourable meteorological conditions. Within limited areas dissemination may be brought about most effectively by mature parasitised apterae.

6. The factors limiting the effectiveness of the parasite are briefly described. The degree of control at the end of May in the field may approximate to 90 per cent.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 35 , Issue 3 , November 1945 , pp. 257 - 270
Copyright
Copyright © Cambridge University Press 1945

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