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Studies on the Toxicity of insecticide Films*

III.—Effect of relative Humidity on the Toxicity of Films

Published online by Cambridge University Press:  10 July 2009

S. Pradhan
S. Pradhan
Affiliation:
Department of Insecticides and Fungicides, Rothamsted Experimental Station, Harpenden, Herts.
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Extract

Experiments on the effect of changes in relative humidity on the toxicity of DDT- and DNC-films to adults of Tribolium castaneum and larvae of Plutella maculipennis are described. With T. castaneum adults the toxicity of both DDT and DNC films is increased at higher relative humidities, but with larvae of P. maculipennis the toxicity of DDT films decreases while that of DNC films increases at higher humidities. Like these experiments the perusal of the literature does not help in deducing any general principle. However, it is possible to collect instances showing that besides the insect and the insecticide, there may be various factors like the range of humidity tested, the strength of the insecticide used, the stage of the insect, etc., which can affect the result of humidity changes.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 40 , Issue 3 , December 1949 , pp. 431 - 444
Copyright
Copyright © Cambridge University Press 1949

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