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TECHNICAL REPORTS
Ecological Risk Assessment

Risk Assessment of Pesticide Runoff from Turf

^a Biological and Environmental Engineering, Riley-Robb Hall, Cornell Univ., Ithaca, NY 14853
^b Dep. of Horticulture, Plant Science Building, Cornell Univ., Ithaca, NY 14853

^* Corresponding author (dah13{at}cornell.edu)

Received for publication December 19, 2001. The TurfPQ model was used to simulate the runoff of 15 pesticides commonly applied to creeping bentgrass (Agrostis stolonifera L.) fairways and greens on golf courses in the northeastern USA. Simulations produced 100-yr daily records of water runoff, pesticide runoff, and pesticide concentration in runoff for three locations: Boston, MA, Philadelphia, PA, and Rochester, NY. Results were summarized as annual and monthly means and annual maximum daily loads (AMDLs) corresponding to 10- and 20-yr return periods. Mean annual pesticide runoff loads did not exceed 3% of annual applications for any pesticide or site, and most losses were substantially less than 1% of application. However, annual or monthly mean concentrations of chlorothalonil, iprodione, and PCNB in fairway runoff often exceeded concentrations that result in 50% mortality of the affected species (LC₅₀) for aquatic organisms. Concentrations of azoxystrobin, bensulide, cyfluthrin, and trichlorfon in extreme (1 in 10 yr or 1 in 20 yr) events often approached or exceeded LC₅₀ levels. Concentrations of halofenozide, mancozeb, MCPP, oxadiazon, propiconazole, thiophanate-methyl, triadimefon, and trinexapac-ethyl were well below LC₅₀ levels, and turf runoff of these chemicals does not appear to be hazardous to aquatic life in surface waters.

Abbreviations: AMDL, annual maximum daily load • LC₅₀, Concentration that results in 50% mortality of the affected species

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