Fungicidal mixtures, comprising as active components a) a morpholine or piperidine derivative I selected from the group of the compounds Ia, Ib, Ic and Id b) compounds of the formula II where the substituents X1 to X5 and R1 to R4 are as defined below: X1 is C1-C4-haloalkyl, C1-C4-haloalkoxy or halogen; X2 to X5 are, independently of one another, hydrogen, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy or C1-C4-haloalkoxy; R1 is C1-C4-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, C1-C4-alkyl-C3-C7-cycloalkyl, C1-C4-alkyl-C3-C7-cycloalkenyl, where these radicals may carry substituents selected from the group consisting of halogen, cyano and C1-C4-alkoxy, R2 is a phenyl radical or a 5- or 6-membered saturated or unsaturated heterocyclyl radical having at least one heteroatom selected from the group consisting of N, O and S, where the cyclic radicals may have one to three substituents selected from the group consisting of halogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, C1-C4-haloalkoxy, C1-C4-alkoxy-C2-C4-alkenyl, C1-C4-alkoxy-C2-C4-alkynyl, R3 and R4 are, independently of one another, hydrogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-alkylthio, N-C1-C4-alkylamino, C1-C4-haloalkyl or C1-C4-haloalkoxy in a synergistically effective amount are described.