Insecticide Residues in Milled Fractions of Dry or Tough Wheat Treated with Malathion, Bromophos, Iodofenphos, and Pirimiphos-methyl1

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Abstract
Water-based emulsions of malathion, bromophos, iodofenphos, and pirimiphos-methyl were applied at 2 dosage rates to No. 2 C.W. red spring wheat of 12 and 16% moisture content to compare residue distribution in fractions milled from wheat samples stored over a period of 6 months. Residue determinations were performed by GLC. High levels of insecticide residues were contained in the bran and middlings. Significantly less (P < 0.05) malathion than bromophos, iodofenphos, or pirimiphos-methyl was found in the bran and middlings after 6 months of storage of treated wheat. Comparatively smaller amounts of insecticide residue were found in the flour than in the bran or middlings. Less iodofenphos than malathion, bromophos, or pirimiphos-methyl occrred in the flour. Pirimiphos-methyl degraded at a comparatively slower rate than malathion, bromophos, or iodofenphos. Residues recovered from fractions of wheat of 16% moisture content were generally lower than residues found in wheat fractions of 12% moisture content.

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