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Immersion technique for measuring susceptibility of house flies and cockroaches to insecticides.

An immersion technique for exposing a large number of the house fly Musca domestica L., and the German cockroach Blattella germanica (L..), to measured doses of toxicants is described. Experiments showed that serial concentrations of DDT, dieldrin, diazinon, and malathion expressed as μg per ml elicit responses directly related to the concentration used. Reproducible results can be obtained by the method. Toxicants are dissolved in 10% acetone-water to which 1 drop of Triton X-100 is added to each 100 ml of solution.