The present invention relates to bicyclic compounds of general formula I, in which X, Y independently of one another are N or C—R4; n is 1, 2, 3, 4 or 5; Ra is halogen, cyano, C1-C6-alkyl, C1-C6-alkoxy, C1-C6-haloalkyl, C1-C6-haloalkoxy, C2-C6-alkenyl, C2-C6-alkenyloxy or C(O)R5; R1 is halogen, cyano, C1-C6-alkyl, C1-C6-haloalkyl, C2-C6-alkenyl, C2-C6-alkynyl, C3-C8-cycloalkyl which is optionally mono- or polysubstituted by alkyl and/or halogen, C5-C8-cycloalkenyl which is optionally mono- or polysubstituted by alkyl and/or halogen, OR6, SR6 or NR7R8; R2 is halogen, cyano, C1-C6-alkyl, C1-C6-haloalkyl, C2-C6-alkenyl, C2-C6-alkynyl, C3-C8-cycloalkyl which is optionally mono- or polysubstituted by alkyl and/or halogen, C5-C8-cycloalkenyl which is optionally mono- or polysubstituted by alkyl and/or halogen, OR6, SR6 or NR7R8; R3 is hydrogen, C1-C6-alkyl, C1-C6-haloalkyl or C3-C6-cycloalkyl which is optionally mono- or polysubstituted by alkyl and/or halogen; and the agriculturally acceptable salts of compounds I, plant protection agents, containing at least one compound of general formula I and/or one agriculturally-acceptable salt of I and at least one liquid or solid carrier substance, as well as a method for controlling phytopathogenic fungi.