Factors Affecting the Loss of DDT and Parathion Residues on Lettuce

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Abstract
Residue samples were taken from plots that received 4-6 applications of DDT or parathion wettable powder and 2 dilution of DDT oil emulsion sprays. A growth curve was plotted for the Iceberg lettuce, and calculations made to determine the actual loss of insecticide deposit as caused by weathering, and the percentage of original residue that would be lost due to the combined action of growth and weathering. All DDT or parathion spray residues on Iceberg lettuce decreased some 94-99% within 14 days when the last application was made 2 weeks prior to harvest. Growth, alone, accounted for approx. 73% apparent decrease of residue, while the percentage of actual insecticide spray deposit loss, as caused by weathering over the 14-day period, approximated 80-99% of the original deposit for the DDT and parathion sprays, respectively.

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