A composition comprising effective amounts of a) a compound of the formula I or an N-oxide or salt thereof, wherein R1, R2, R3 and R4 are hydrogen, hydroxyl, nitro, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio or C1-C4-haloalkylthio; R5, R6 and R7 are hydrogen, hydroxyl, cyano, nitro, halogen, C1-C7-alkyl, C1-C7-haloalkyl, C1-C7-alkoxy, C1-C7-haloalkoxy, C1-C7-alkylthio, C1-C7-haloalkylthio, C1-C7-hydroxyalkyl, C2-C4-acyl, aryl or aryloxy, it being possible for the radicals with aryl to carry one to three of the following groups: cyano, nitro, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio and C1-C4-haloalkylthio, and d) (2RS,3SR)-1-[3-(2-chlorophenyl)-2-(4-fluorophenyl)oxiran-2-ylmethyl]-1H-1,2,4-triazole (IV) exhibits a synergistic fungicidal activity.