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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
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.
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