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Temephos resistance in Simulium damnosum Theobald (Diptera: Simuliidae): a comparative study between larvae and adults of the forest and savanna strains of this species complex

Published online by Cambridge University Press:  10 July 2009

J. Hemingway ,
A. Callaghan  and
D. C. Kurtak
J. Hemingway*
Affiliation:
London School of Hygiene and Tropical Medicine, Keppel Street, Gower Street, London, WCIE 7HT, UK
A. Callaghan
Affiliation:
London School of Hygiene and Tropical Medicine, Keppel Street, Gower Street, London, WCIE 7HT, UK
D. C. Kurtak
Affiliation:
Onchocerciasis Control Programme, World Health Organization, B.P. 549 Ouagadougou, Burkina Faso
*
* To whom all correspondence should be sent.
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Abstract

Temephos resistance in savanna cytospecies of Simulium damnosum Theobald s.l. and the forest cytospecies S. sanctipauli Vajime & Dunbar, from West Africa is correlated with an increase in general esterase activity. Metabolism studies indicated that esterase products were the major metabolities in both forest and savanna resistant strains of S. damnosum s.l. compared to the susceptibles. In the presence of an esterase synergist, a large amount of the oxon analogue of temephos was produced by the resistant forest cytospecies S. sanctipauli. This strain is also resistant to chlorphoxim, and it is likely that the increase in oxidative activity observed is connected with the chlorphoxim rather than the temephos resistance. There was no evidence of glutathione transferase-, oxidase- or acetylcholinesterase-based temephos resistance machanisms in the savanna species of S. damnosum s.l.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 79 , Issue 4 , November 1989 , pp. 659 - 670
Copyright
Copyright © Cambridge University Press 1989

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