Effect of Rainfall and Other Factors on the Toxicity of Certain Insecticides1

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Abstract
Higher dosages of insecticide sprays were necessary to kill boll weevils in the field than in the laboratory. Such factors as range in humidity, sunshine, dew and wind reduced toxicity, especially of aldrin. In tests on salt-marsh caterpillars, the type of emulsifier used in making the miscible oil concentrate affected the toxicity of the sprays as well as its residual toxicity following rains. Effect of rain on residual toxicity of benzene hexachloride and toxaphene applied as sprays and dusts is discussed. A simulated rain of 0.5 in. greatly reduced the toxicity of toxaphene -sulfur dusts and the loss was little affected by addition of either oil or a commercial sticker.

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