Winter rain, snowmelt, and (lack of) fungicide persistence

"Turfgrass managers rely on fungicides to suppress snow mold diseases in areas with persistent snow cover, which are commonly applied once or twice in late fall prior to snow cover." That's the first line of the abstract in Persistence of Fungicides Applied to Control Snow Mold of Turfgrass as Influenced by Snow Cover and Antitranspirants by Hockemeyer et al.

They applied propiconazole and chlorothalonil fungicides prior to the first significant snowfall to Penncross creeping bentgrass for three consecutive winters. Then…