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Comparison of two alpha-cyano pyrethroids when impregnated into bednets against a pyrethroid resistant and susceptible strain of Anopheles stephensi (Diptera: Culicidae) and their F1 progeny

Published online by Cambridge University Press:  09 March 2007

J.H. Kolaczinski  and
C.F. Curtis
J.H. Kolaczinski*
Affiliation:
London School of Hygiene and Tropical Medicine, Department of Infectious and Tropical Diseases, Disease Control and Vector Biology Unit, Keppel Street, London, WC1E 7HT, UK
C.F. Curtis
Affiliation:
London School of Hygiene and Tropical Medicine, Department of Infectious and Tropical Diseases, Disease Control and Vector Biology Unit, Keppel Street, London, WC1E 7HT, UK
*
*Fax: +44 (0) 20 7467 9536 E-mail: [email protected]
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Abstract

The two alpha-cyano pyrethroid insecticides lambda-cyhalothrin and alpha-cypermethrin were tested as bednet treatments at a target dose of 20 mg m-2. To establish their efficacy, female pyrethroid resistant and susceptible Anopheles stephensi Liston, and the F1-hybrids were allowed to fly freely in a room with a human subject under an impregnated net. Both treatments provided good personal protection by significantly reducing the number of blood fed mosquitoes compared to an untreated control net. Mortality after 24 h was significantly higher for the alpha-cypermethrin treated net when compared to lambda-cyhalothrin. For each insecticide there were no significant differences in the proportion of susceptible homozygotes and F1-hybrids found dead after a 24 h holding period, which suggests that there would be no selection for pyrethroid resistant heterozygotes by either of the insecticides.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 90 , Issue 2 , April 2000 , pp. 119 - 123
Copyright
Copyright © Cambridge University Press 2000

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