Isophthalamides of the formula and salts thereof in which the symbols and indices are defined as follows: Q is Q 1 or Q 2, W is nitrogen, X is halogen, (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl, (C 3 -C 6)-cycloalkyl, R 1 O, R 2 n S, R 1 O-(C 1 -C 6) -alkyl or R 2 S n -(C 1 -C 6) -alkyl, Y is halogen, (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl, R 1 O or R 2 n S, with the proviso that Y is not methylsulfonyl when X is chlorine, Z 1, Z 2 are independently one of the following groups, each of which is substituted by s radicals from the group consisting of halogen, cyano, R 1 C, R 1 OC, R 1 O and R 2 n S: (C 1 -C 6) -alkyl, (C 3 -C 6)-cycloalkyl, (C 3 -C 6)-cycloalkyl-(C 1 -C 6)-alkyl, (C 1 -C 6)-alkyl-O-(C 1 -C 6) -alkyl, (C 2 -C 6)-alkenyl, (C 2 -C 6)-alkenyl- (C 1 -C 6)-alkyl, (C 2 -C 6)-alkynyl, (C 2 -C 6)-alkynyl-(C 1 -C 6)-alkyl, (C 1 -C 6) -alkoxy, R 2 S n-(C 1 -C 6)-alkyl, R 1 C, R 1 OC, R 1 C -(C 1 -C 6)-alkyl, R 1 OC -(C 1 -C 6)-alkyl, R 1 NH- (C 1 -C 6) -alkyl, R 1 2 N-(C 1 -C 6) -alkyl, R 1 NHC -(C 1 -C 6)-alkyl or R 1 2 NC -(C 1 -C 6)-alkyl, or one of the following groups, each of which is substituted by s radicals from the group consisting of halogen, (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl, (C 1 -C 6)-alkoxy, halo- (C 1 -C 6) -alkoxy, R 1 C and R 1 OC: phenyl, benzyl, heterocyclyl or heterocyclyl-(C 1 -C 6)-alkyl, or Z 1 and Z 2, together with the nitrogen atom to which they are bonded, form a four-, five-, six-or seven-membered heterocycle which contains m further heteroatoms from the group of O, S and N as ring members and which is substituted by m radicals from the group consisting of carbonyl, halogen, (C 1 -C 6)-alkyl, halo- (C 1 -C 6) -alkyl, (C 1 -C 6) -alkoxy and halo-(C 1 -C 6) -alkoxy, R 1 is (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl or (C 3 -C 6)-cycloalkyl, R 2 is (C 1 -C 6) -alkyl, R x is (C 1 -C 6) -alkyl, (C 1 -C 6)-alkyl-O-(C 1 -C 6)-alkyl or phenyl, m is 0, 1, 2 or 3, n is 0, 1 or 2, s is 0, 1, 2, 3 or 4. Q is Q 1 or Q 2, W is nitrogen, X is halogen, (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl, (C 3 -C 6)-cycloalkyl, R 1 O, R 2 n S, R 1 O-(C 1 -C 6) -alkyl or R 2 S n -(C 1 -C 6) -alkyl, Y is halogen, (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl, R 1 O or R 2 n S, with the proviso that Y is not methylsulfonyl when X is chlorine, Z 1, Z 2 are independently one of the following groups, each of which is substituted by s radicals from the group consisting of halogen, cyano, R 1 C, R 1 OC, R 1 O and R 2 n S: (C 1 -C 6) -alkyl, (C 3 -C 6)-cycloalkyl, (C 3 -C 6)-cycloalkyl-(C 1 -C 6)-alkyl, (C 1 -C 6)-alkyl-O-(C 1 -C 6) -alkyl, (C 2 -C 6)-alkenyl, (C 2 -C 6)-alkenyl- (C 1 -C 6)-alkyl, (C 2 -C 6)-alkynyl, (C 2 -C 6)-alkynyl-(C 1 -C 6)-alkyl, (C 1 -C 6) -alkoxy, R 2 S n-(C 1 -C 6)-alkyl, R 1 C, R 1 OC, R 1 C -(C 1 -C 6)-alkyl, R 1 OC -(C 1 -C 6)-alkyl, R 1 NH- (C 1 -C 6) -alkyl, R 1 2 N-(C 1 -C 6) -alkyl, R 1 NHC -(C 1 -C 6)-alkyl or R 1 2 NC -(C 1 -C 6)-alkyl, or one of the following groups, each of which is substituted by s radicals from the group consisting of halogen, (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl, (C 1 -C 6)-alkoxy, halo- (C 1 -C 6) -alkoxy, R 1 C and R 1 OC: phenyl, benzyl, heterocyclyl or heterocyclyl-(C 1 -C 6)-alkyl, or Z 1 and Z 2, together with the nitrogen atom to which they are bonded, form a four-, five-, six-or seven-membered heterocycle which contains m further heteroatoms from the group of O, S and N as ring members and which is substituted by m radicals from the group consisting of carbonyl, halogen, (C 1 -C 6)-alkyl, halo- (C 1 -C 6) -alkyl, (C 1 -C 6) -alkoxy and halo-(C 1 -C 6) -alkoxy, R 1 is (C 1 -C 6) -alkyl, halo- (C 1 -C 6) -alkyl or (C 3 -C 6)-cycloalkyl, R 2 is (C 1 -C 6) -alkyl, R x is (C 1 -C 6) -alkyl, (C 1 -C 6)-alkyl-O-(C 1 -C 6)-alkyl or phenyl, m is 0, 1, 2 or 3, n is 0, 1 or 2, s is 0, 1, 2, 3 or 4.