Effect of Varying Conditions in a Laboratory Testing Technique on the Mortality of Mosquito Larvae

Abstract

The mortality of mosquito larvae increased as the volume of Acetone-water suspensions or solutions of dieldrin, lindane, malathion, and DDT was increased from 100 to 1,000 ml The increase was greater and more consistent with DDT than with the other larvicides lind with larvae of Anopheles quadrimaculatus Say and Aedes taeniorhynchus (Wied.) than with Aedes aegypti (L.). No increase in mortality Was caused with Parathion. When the diameter of the test containers Was increased from 3 to 6 inches but the concentration and volume of the suspensions or solutions were constant, mortality of quadrimaculatus decreased when dieldrin, lindane, and DDT were used, but not with malathion or parathion. No difference in mortality was observed with the other two species of larvae.