Simulations of Fungicide Runoff Following Applications for Turfgrass Disease Control

• DOI: 10.1094/pdis.2004.88.4.391
• Publication Date: 2007-05-11T10:24:52Z
• Authors: P. Vincelli
• Keywords: Disease Control; Disease management; Plant disease

Computer simulations of fungicide loading in surface water runoff were conducted with fungicides commonly used golf course fairways and lawns Kentucky. For all fungicides, values for degradation half-life organic carbon partition coefficient obtained from published sources; other input parameters selected to simulate conditions typical local swards. Spray programs tested using a 21-year period weather data Lexington, KY. Predicted amounts determined, predicted concentrations (mg/liter) compared 50% lethal concentration (LC50) rainbow trout Daphnia magna. All simulated chlorothalonil applications produced that greatly exceeded the LC50 both indicator species. some applications, azoxystrobin, iprodione, pentachloronitrobenzene at least one Under simulated, metalaxyl, propiconazole, thiophanate methyl, triadimefon well below Although actual loaded into relatively low, these suggest turfgrass high intrinsic toxicity species could pose risk populations primary secondary consumers aquatic ecosystems.