Evidence of Enhanced Degradation of Isofenphos in Turfgrass Thatch and Soil

Abstract
Supernatant from aqueous dispersions of turfgrass thatch and soil from four Ohio golf courses where spring application of isofenphos (Oftanol) failed to control summer-generation scarabaeid larvae, were injected into a buffered nutrient solution of 10 ppm isofenphos. High-pressure liquid chromatography analysis showed that isofenphos disappeared (91 to ≥99%) in ≤3 d, whereas no degradation occurred with samples from an untreated site. Methods described may be useful in elucidating the enhanced degradative potential of certain other pesticides.

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