Sterol-inhibiting CGA 64251 [1-[[2-(2,4-dichlorophenyl)-4-ethyl-1,3-dioxolan-2-yl]methyl]-H-1,2,4-triazole], bitertanol, fenarimol, fenapanil, prochloraz, triadimefon and triforine were evaluated on apple in the greenhouse. Against Venturia inaequalis, they were more effective in eradicative than in protective action. They inhibited spore production when applied before scab symptoms appeared but not when applied to existing scab lesions. Against Podosphaera leucotricha, CGA 64251, bitertanol and triadimefon sprays gave excellent protection. Vapor from CGA 64251 and triadimefon gave good protection against mildew on unsprayed trees.