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Lead arsenate has been for years the main reliance in the control of insects that prey on food crops. As the product is poisonous a significant amount of residue from its use on fruits and vegetables is deleterious to health. The United States Department of Agriculture has been endeavoring to discover a more nearly ideal insecticide. According to the chief of the Bureau of Entomology and Plant Quarantine, Lee A. Strong, the most promising discovery which the department has made is a sulfur compound called phenothiazine. This new product, which is easily prepared by combining sulfur and diphenylamine, has been tested in large scale field tests, which, although highly encouraging, showed the need for more study. Phenothiazine will control the codling moth, the chief insect pest affecting the apples in the Northwest, much better than will lead arsenate, and it leaves a residue that is less likely than lead arsenate
THE SEARCH FOR NEW INSECTICIDES. JAMA. 1937;108(13):1124-1125. doi:10.1001/jama.1937.02780130108012