Effects of Heterogeneous Distribution and Codistillation on the Results of Tests with DDT Against Mosquito Larvae

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Abstract
The concentration of DDT in suspensions was shown to be less than the theoretical, and to vary with the volume of the suspension and the size of the container. This variation resulted from differences in the loss of DDT by codistillation and/or by association with the water interfaces, which explained the resulting differences in mosquito mortality. The mortality of Anopheles quadrimaculatus Say was influenced more than that of Aedes aegypti (L.), owing to a difference in the behavior of the larvae and the dosage-mortality response. Biological data obtained with parathion, malathion, lindane, and dieldrin indicate that insufficient quantities of these insecticides are lost from the containers to alter mortality under normal test conditions.

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