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The flight activity of the sheep headfly, Hydrotaea irritans (Fallén) (Diptera:Muscidae)

Published online by Cambridge University Press:  10 July 2009

A. D. Berlyn
A. D. Berlyn
Affiliation:
Department of Zoology, The West of Scotland Agricultural College, Auchincruive, Ayr KA6 5HW, UK.
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Abstract

The flight activity of Hydrotaea irritans (Fall.) was investigated in western Scotland using an unbaited suction trap, a carbon-dioxide-baited suction trap and a Manitoba trap. Consistently more female flies were caught than males. Trapping experiments showed that carbon dioxide and visual or thermal stimuli influence long-range attraction and short-range orientation in host-seeking flies. The seasonal activity of adults was determined from the geometric means of catches from a suction trap baited with carbon dioxide and a Manitoba trap. H. irritans was shown to be univoltine. The activity of females was greatest in the middle of July and declined sharply in the first week of August. Male activity reached a peak at the same time as that of the females, then declined until no males were caught after mid-August. Females were most active between 10.00 and 18.00 h B.S.T., with a peak about 13.00 h. There was no variation in sex ratio during the day. Multiple regression equations of climatic and seasonal factors with log catches of flies were very similar for the two types of trap. Radiant temperature, illumination, wind speed and date were shown to influence activity of females and, with the exception of illumination, male activity also. Seasonal activity curves calculated from the regression equations were plotted for both sexes in the two traps.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 68 , Issue 2 , July 1978 , pp. 219 - 228
Copyright
Copyright © Cambridge University Press 1978

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