The invention relates to 2-substituted pyridines of the formula I in which the index n and the substituents R1 to R4 and L are as defined in the description and in each case one of the two ring members X1, X2 is N, the other is C—H or C-halogen; Y is a group —CH—R1—, —N—R1—, —O— or —S— and is five- or six-membered hetaryl comprising 1 to 3 heteroatoms selected from the group consisting of O, N and S or is phenyl, and to processes for their preparation, intermediates for their preparation, pesticidal compositions and methods for controlling harmful fungi and animal pests using the compounds according to the invention.