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The Susceptibility of fourth-stage Larvae of Anopheles gambiae to DDT and Dieldrin

Published online by Cambridge University Press:  10 July 2009

M. Christie  and
G. Webbe
M. Christie
Affiliation:
Entomologists, Medical Department, Tanganyika Territory.
G. Webbe
Affiliation:
Entomologists, Medical Department, Tanganyika Territory.
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Extract

The validity of the MLD (Minimum Lethal Dose) as a practical concept for measuring toxicity, despite its obvious lack of precision, is discussed. Its use has justification.

The 48-hour MLD of acetone-water suspensions and oil films of DDT and dieldrin for early fourth-stage larvae of Anopheles gambiae Giles have been measured.

The results show A. gambiae to be relatively resistant to DDT.

In acetone-water suspension dieldrin appears to be about six times as toxic as DDT. In oil solutions this difference is more marked, the ratio being in the neighbourhood of 20:1.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 47 , Issue 1 , March 1956 , pp. 1 - 6
Copyright
Copyright © Cambridge University Press 1956

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