Abstract
The use of water-soluble insecticides for the control of floodwater Aedes mosquitoes by introducing the chemical into irrigation water as it flows into the fields has been studied for several years. Following laboratory studies in Orlando, Florida (Gahan et al., 1955a, 1955b), field studies in California (Gahan and Mulhern, 1955c) and in Arkansas (Gahan and Noe, 1955d) showed it to be a promising method. Further studies in 1956 (unpublished) indicated that the effectiveness of this method decreased over long distances, of flow and in shallow water. Laboratory studies were therefore made to determine factors responsible for this loss of effectiveness in order to aid in finding a chemical or developing a formulation that would increase the efficacy of this type of treatment. Fourth-instar larvae of Anopheles quadrimaculatus Say were the test insects.
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