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Tests of pyrethroid vaporising mats against Aedes aegypti (L.) (Diptera: Culicidae)

Published online by Cambridge University Press:  10 July 2009

P. R. Chadwick  and
C. J. Lord
P. R. Chadwick
Affiliation:
Wellcome Research Laboratories, Berkhamsted, Herts. HP4 2QE, U.K..
C. J. Lord
Affiliation:
Wellcome Research Laboratories, Berkhamsted, Herts. HP4 2QE, U.K..
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Abstract

Abstract

Vaporising mats are used to volatilise small amounts of pyrethroid to prevent mosquito nuisance within houses. A small absorbent mat containing pyrethroid is placed on a 5- to 6-W electric heater. The mat surface temperature is about 125°C. Pyrethroid is released for several hours at a slowly diminishing rate. In tests, no evidence of degradation of bioallethrin was obtained. Vapour from mats inhibited biting by female Aedes aegypti (L.) and caused knockdown and kill. A commercial mat containing 88 mg allethrin was as effective as a mosquito coil containing 0·25% allethrin. In laboratory-made mats, 40 mg bioallethrin or 19 mg S-bioallethrin gave equal or better action than allethrin. Additives, such as piperonyl butoxide, mineral oil or antioxidant slightly reduced the rate of emission of pyrethroid and diminished the bite inhibitory and knockdown effects.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 67 , Issue 4 , December 1977 , pp. 667 - 674
Copyright
Copyright © Cambridge University Press 1977

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