SUMMARY A field experiment for the control of aphids on spinach with parathion was conducted to develop data for a complete decline curve following treatment. Data show that a tolerance of 1 ppm cannot be achieved within the seven‐day withdrawal period. Data were then developed over a six‐month period of frozen storage for residue levels. The program allowed a comparative study of methods of analysis, a study of extraction methods, and a study of the residue level of parathion on spinach over an extended period of frozen storage. The effect of storage on the parathion residues is discussed.
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Beckman et al. (1965) studied this question.
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