Conversion of triadimefon fungicide to triadimenol during leaching through turfgrass soils

The leaching characteristics of the fungicide, triadimefon were studied in a silt loam and a fine sandy loam soil and an acid sand each prepared in plots as lysimeters and seeded with Penncross creeping bentgrass. The effect of sampling interval after last fungicide application and volume of irrigation water on pesticide leaching were studied. In both soils and sand, triadimefon was converted to triadimenol, the latter metabolite being present in the leachate of each growth medium. The concentration of triadimenol in the leachates greatly exceeded that of triadimefon and triadimenol and was much higher in the leachates of the sand than in those of the soils. Factors affecting the movement of pesticides in soils are discussed.