Trichlorfon is an organophosphate insecticide used primarily for the control of grubs in turf as formulated granules and a liquid concentrate for spray applications. The product label requires watering-in (irrigation) after application to increase effectiveness and to reduce photodegradation.  However, more information is needed to determine the amount of water required to move the active ingredient into the subsurface soil. The movement of trichlorfon from granules and treated turf was investigated for three different irrigation scenarios: 0.25, 0.50 and 0.75 inches using both greenhouse and soil columns.  Three individual experiments were conducted; dissipation from formulated granules, dissipation from 2 types of turf and movement from surface to subsurface by soil column leaching.  After 0.25 inches of rain, approximately 2% of active ingredient was available on the turf after spray application.  For granular application only 0.8% was still present on the granules after 0.25 inches of water applied.

Effective watering-in approaches for trichlorfon applied to turf

248th National Meeting (2014)

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