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Abstract
Persistence of Fensulfothion (O,O‐diethyl‐O‐(p‐methyl sulfinyl) phenyl phosphorothioate) in soil under laboratory conditions was followed using 3 day old larvae of the silkworm, Bombyx mori L. and also by cholinesterase inhibition method. Low concentrations i.e., 50–175 ppm persisted for about 50–60 days whereas high concentrations (250–500 ppm) remained even beyond 900 days in soil. Run‐off water and soil from fields treated with fensulfothion were found to contain high concentrations of factors capable of inhibiting cholinesterase. Paper and thin layer Chromatographic analysis showed that fensulfothion and its oxygen analogues were the predominant compounds present in the samples. That fenaulfothion is among the more peristent organophosphorous pesticides is stressed.