THE INSECTICIDE FENITROTHION IN HEADWATERS STREAMS FROM LARGE-SCALE FOREST SPRAYING

Abstract
Concentrations of the insecticide fenitrothion in water varied greatly among streams, depending upon spray history and weather. Sprays at 3 oz/ac (210 g/ha) resulted in measurable concentrations in streams as far as 2.5 mi (4 km) from the sprayed area. Concentrations (usually < 15 ppb) diminished quickly in fast flowing streams, and still faster when a spate followed spray application.

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