The present invention relates to mixtures of fungicidally active compounds comprising at least one substituted 3-hydroxyl-3-(3-pyridyl)propanoate compound of the formula I wherein: X1 and X2 are hydrogen or X1 together with X2 form a covalent bond; R1 is H, CN, C1-C6-alkyl, C2-C6-alkynyl, C1-C6-alkoxy-C1-C6-alkyl, C1-C6-alkylthio-C1-C6-alkyl, C1-C6-haloalkyl, C1-C6-alkoxy, aryl-C1-C4-alkyl, aryloxy-C1-C4-alkyl, arylthio-C1-C4-alkyl, aryl, hetaryl-C1-C4-alkyl, hetaryloxy-C1-C4-alkyl, hetarylthio-C1-C4-alkyl or heteroaryl, wherein the cyclic moieties of the last eight radicals are unsubstituted or substituted with 1, 2 or 3 radicals selected from halogen, C1-C4-alkyl, C2-C4-alkynyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-alkylthio, C1-C4-alkylsulfinyl, C1-C4-alkylsulfonyl, C1-C4-haloalkoxy, C1-C4-haloalkylthio, cyano and nitro; A is a covalent bond or C1-C4-alkylen, which is unsubstituted or which may carry a substitutent selected from C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy and cyano; Ar is aryl or heteroaryl, wherein the cyclic moieties of the aromatic radicals are unsubstituted or substituted with 1, 2 or 3 radicals Ra, where the radicals Ra are identical or different and selected from halogen, C1-C4-alkyl, C2-C4-alkenyl, C2-C4-alkynyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-alkylthio, C1-C4-haloalkoxy, C1-C4-haloalkylthio, cyano, nitro, aryl, hetaryl, aryloxy, hetaryloxy, aryloxy-C1-C4-alkyl and hetaryloxy-C1-C4-alkyl, wherein the cyclic moieties of the six last mentioned radicals are unsubstituted or substituted with 1, 2 or 3 radicals selected from halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-alkylthio, C1-C4-haloalkoxy, cyano and nitro; or a tautomer or a salt thereof. and at least one further fungicidally active compound II.