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Ovarian and larval development of the sheep headfly, Hydrotaea irritans (Fallén) (Diptera, Muscidae)

Published online by Cambridge University Press:  10 July 2009

A. C. Kirkwood
A. C. Kirkwood
Affiliation:
Ministry of Agriculture, Fisheries and Food Central Veterinary Laboratory, Weybridge, Surrey KT15 3NB, UK.
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Abstract

The biology of Hydrotaea irritans (Fall.) has been studied at Weybridge since 1973. The flies have failed to mate in cages and only those which have been fertilised before capture have laid viable eggs in the laboratory. In experiments in 1975–76 flies in the field emerged from June onwards but development of the ovaries (noted in seven stages) to the point of ovi-position was not completed until September. Some 1400 larvae were established in culture and, although they had reached a maximum size by January, they continued to feed until 14 March. Pupation lasted for 25 to 32 days during 6 May to 12 June and a total of 185 flies emerged from 4 June to 9 July. The results of these experiments confirm that H. irritans does not diapause and that the species is univoltine.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 66 , Issue 4 , December 1976 , pp. 757 - 763
Copyright
Copyright © Cambridge University Press 1976

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