The present invention relates to 2-(pyridin-2-yl)pyrimidines and their use for controlling harmful fungi, and also to crop protection compositions comprising such compounds as effective component. in which: Q is a fused saturated 5-, 6- or 7-membered carbocycle or a 5-, 6- or 7-membered heterocycle which, in addition to the carbon ring members, has one or two heteroatoms selected from the group consisting of oxygen and sulfur as ring members, where the carbocycle and the heterocycle are unsubstituted or have 1, 2, 3 or 4 C1-C4-alkyl groups as substituents; R1 is hydrogen, OH, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, C1-C4-haloalkoxy or halogen; R2 is hydrogen, NO2, halogen, C1-C6-alkyl, C3-C6-cycloalkyl, C1-C6-alkoxy, C1-C6-haloalkyl or C1-C6-haloalkoxy; R3 is hydrogen, halogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, or C1-C4-haloalkoxy; R4 is phenyl, 5-membered heteroaryl which has 1, 2, 3 or 4 nitrogen atoms or 1 heteroatom selected from the group consisting of oxygen and sulfur and optionally 1, 2 or 3 nitrogen atoms as ring atoms, or 6-membered hetaryl which has 1, 2, 3 or 4 nitrogen atoms as ring members, where phenyl and 5- and 6-membered hetaryl may have 1, 2, 3 or 4 substituents Ra.