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Factors affecting abundance and oviposition rates of a field population of the Old World screw-worm fly, Chrysomya bezziana (Diptera: Calliphoridae)

Published online by Cambridge University Press:  09 March 2007

R.J. Mahon ,
H. Ahmad  and
K.G. Wardhaugh
R.J. Mahon*
Affiliation:
CSIRO Entomology, GPO Box 1700Canberra ACT 2601Australia
H. Ahmad
Affiliation:
Department of Veterinary Services, Institut Haiwan, PO Box 450 Kluang, Johor 86009, Malaysia
K.G. Wardhaugh
Affiliation:
CSIRO Entomology, GPO Box 1700Canberra ACT 2601Australia
*
*Fax: 61 6246 4042 E-mail: [email protected]
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Abstract

Sentinel cattle and a grid of swormlure-baited sticky traps were used to monitor a Malaysian population of the Old World screw-worm fly, Chrysomya bezziana Villeneuve. Observations were carried out on an isolated cattle station at monthly intervals during the period August 1996 to June 2000. The number of flies caught was unaffected by weather conditions at the time of trapping, but was positively correlated with the total rainfall and the average daily air temperature prevailing 15–28 days earlier, when trapped flies were still juveniles. Trap catches were biased in favour of females, but daily catch rates of both sexes increased significantly the longer traps were open, suggesting that efficacy was related to the differential volatility of the chemicals comprising swormlure. Oviposition on sentinel cattle occurred mostly in late afternoon or early evening but increased significantly as the wound aged. Oviposition rates were positively correlated with female catch rates, but the relationship was curvilinear, suggesting that fly populations may be subject to some form of density-dependent constraint. Consistent differences in oviposition rates on sentinel cattle at different localities on the cattle station suggested the existence of highly clumped, quasi-stationary populations. Differences in trap catches between traps located in pastoral areas and those sited in nearby oil palm or rubber plantations supported this interpretation of the data. These findings are discussed in relation to the use of the sterile insect technique for the control of screw-worm fly infestations.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 94 , Issue 4 , August 2004 , pp. 359 - 368
Copyright
Copyright © Cambridge University Press 2004

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