Compounds of formula wherein L is linear C 1 -C 4 alkanediyl, C 2 -C 4 alkenediyl or C 2 -C 4 alkynediyl, each of which may be substituted with one or more groups independently selected from halogen, C 1 -C 4 alkyl and C 3 -C 6 -cycloalkyl, wherein two C 1 -C 4 -alkyl substituents may form a ring together with the carbon atom to which they are bonded; or a moiety (CH 2) n -X-(CH 2) m wherein n and m are independently 0, 1 or 2 and X is selected from a group X 1, X 2, X 3 or X 4, wherein X 1 is C 3 -C 7 -cycloalkanediyl, which is optionally substituted with 1 to 3 substituents selected from halogen, cyano, and C 1 -C 4 alkyl, wherein (CH 2) n - and (CH 2) m - may be attached either to the same or to different carbon atoms of X 1; or X 2 is phenylene, which is optionally substituted with 1 to 4 substituents selected from halogen, cyano, and C 1 -C 4 alkyl; or X 3 is C 5 -C 6 -heteroarenediyl, which is optionally substituted with 1, 2 or 3 substituents selected from halogen, cyano, and C 1 -C 4 alkyl; or X 4 is C 5 -C 8 bicycloalkanediyl, which is optionally substituted with 1 to 4 substituents selected from halogen, cyano, and C 1 -C 4 alkyl wherein (CH 2) n - and (CH 2) m - may be attached either to the same or to different carbon atoms of X 4; and Y is selected from a group (T 1) wherein R 1, R 2 and R 3 are each independently selected from hydrogen, halogen, cyano, nitro, linear or branched C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, halogen-substituted linear or branched C 1 -C 6 -alkyl, halogen-substituted C 1 -C 6 -alkoxy, halogen substituted C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkylsulphanyl, Ci-Ce-alkylsulphinyl, C 1 -C 6 -alkylsulphonyl, N- C 1 -C 6 -alkylamino, N,N -di-C 1 -C 6 -alkylamino, N -C 1 -C 3 -alkoxy-C 1 -C 4 -alkylamino and 1-pyrrolidinyl or from a group (T 2) wherein Z 1 and Z 2 are each independently selected from hydrogen, halogen, cyano, nitro, linear or branched Ci-Ce-alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylcarbonyl, halogen-substituted linear or branched C 1 -C 6 -alkyl, halogen-substituted Ci-Ce-alkoxy, halogen substituted C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkylsulphanyl, C 1 -C 6 -alkylsulphinyl, C 1 -C 6 -alkylsulphonyl, N -C 1 -C 6 -alkylamino, N,N -di-C 1 -C 6 -alkylamino, N -C 1 -C 3 -alkoxy-C 1 -C 4 -alkylamino and 1-pyrrolidinyl; and Z 3 represents hydrogen, linear or branched C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl, aryl or hetaryl, each of which may be substituted with 1 to 5 substituents selected from hydroxy, halogen, cyano, nitro, amino, C 1 -C 3 -alkyl, C 1 -C 3 -alkoxy, hydroxycarbonyl, alkoxycarbonyl, alkylcarbamoyl, cycloalkylcarbamoyl and phenyl; and the salts thereof. L is linear C 1 -C 4 alkanediyl, C 2 -C 4 alkenediyl or C 2 -C 4 alkynediyl, each of which may be substituted with one or more groups independently selected from halogen, C 1 -C 4 alkyl and C 3 -C 6 -cycloalkyl, wherein two C 1 -C 4 -alkyl substituents may form a ring together with the carbon atom to which they are bonded; or a moiety (CH 2) n -X-(CH 2) m wherein n and m are independently 0, 1 or 2 and X is selected from a group X 1, X 2, X 3 or X 4, wherein X 1 is C 3 -C 7 -cycloalkanediyl, which is optionally substituted with 1 to 3 substituents selected from halogen, cyano, and C 1 -C 4 alkyl, wherein (CH 2) n - and (CH 2) m - may be attached either to the same or to different carbon atoms of X 1; or X 2 is phenylene, which is optionally substituted with 1 to 4 substituents selected from halogen, cyano, and C 1 -C 4 alkyl; or X 3 is C 5 -C 6 -heteroarenediyl, which is optionally substituted with 1, 2 or 3 substituents selected from halogen, cyano, and C 1 -C 4 alkyl; or X 4 is C 5 -C 8 bicycloalkanediyl, which is optionally substituted with 1 to 4 substituents selected from halogen, cyano, and C 1 -C 4 alkyl wherein (CH 2) n - and (CH 2) m - may be attached either to the same or to different carbon atoms of X 4; and Y is selected from a group (T 1) wherein R 1, R 2 and R 3 are each independently selected from hydrogen, halogen, cyano, nitro, linear or branched C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, halogen-substituted linear or branched C 1 -C 6 -alkyl, halogen-substituted C 1 -C 6 -alkoxy, halogen substituted C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkylsulphanyl, Ci-Ce-alkylsulphinyl, C 1 -C 6 -alkylsulphonyl, N- C 1 -C 6 -alkylamino, N,N -di-C 1 -C 6 -alkylamino, N -C 1 -C 3 -alkoxy-C 1 -C 4 -alkylamino and 1-pyrrolidinyl or from a group (T 2) wherein Z 1 and Z 2 are each independently selected from hydrogen, halogen, cyano, nitro, linear or branched Ci-Ce-alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylcarbonyl, halogen-substituted linear or branched C 1 -C 6 -alkyl, halogen-substituted Ci-Ce-alkoxy, halogen substituted C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkylsulphanyl, C 1 -C 6 -alkylsulphinyl, C 1 -C 6 -alkylsulphonyl, N -C 1 -C 6 -alkylamino, N,N -di-C 1 -C 6 -alkylamino, N -C 1 -C 3 -alkoxy-C 1 -C 4 -alkylamino and 1-pyrrolidinyl; and Z 3 represents hydrogen, linear or branched C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl, aryl or hetaryl, each of which may be substituted with 1 to 5 substituents selected from hydroxy, halogen, cyano, nitro, amino, C 1 -C 3 -alkyl, C 1 -C 3 -alkoxy, hydroxycarbonyl, alkoxycarbonyl, alkylcarbamoyl, cycloalkylcarbamoyl and phenyl; and the salts thereof.