Pyridine-2,3-dicarboxylic acid diamides

A pyridine-2,3-dicarboxamide of the formula I

• where:
• R1 is halogen, CN, NO2, C1-C3-alkyl, C1-C3-haloalkyl, C1-C3-alkoxy, C1-C3-haloalkoxy, C1-C3-alkylthio, C1-C3-haloalkylthio, C1-C3-alkylsulfinyl, C1-C3-haloalkylsulfinyl, C1-C3-alkylsulfonyl, C1-C3-haloalkylsulfonyl, C3-C6-cycloalkyl, C3-C6-cycloalkyl-C1-C3-alkyl, C2-C4-alkenyl, C2-C4-haloalkenyl, C2-C4-alkynyl, C3-C4-haloalkynyl, amino, C1-C3-monoalkylamino or C1-C3-alkylcarbonyl;
• o is 2 or 3;
• R2 is selected from CN, C1-C3-alkylcarbonyl, C1-C3-alkylcarbamoyl, carbamoyl, C1-C3-alkoxycarbonyl, C1-C3-alkoximinomethyl, C1-C3-alkoxymethyl, formyl, C1-C3-alkyl, difluormethoxy and halogen, provided that one radical, which is selected from CN, C1-C3-alkylcarbonyl, carbamoyl, C1-C3-alkoxycarbonyl, C1-C3-alkoximinomethyl, C1-C3-alkoxymethyl and formyl, is located in the 2-position or in the 6-position, and at least one further radical is located in the 2-position, in the 3-position and/or in the 6-position;
• R5 is hydrogen, C1-C3-alkyl, OH or C1-C4-alkoxy;
• R6 is hydrogen, C1-C6-alkyl, C1-C6-haloalkyl, C1-C6-cyanoalkyl, C3-C6-cycloalkyl, C3-C6-cycloalkenyl, C3-C6-cycloalkyl-C1-C3-alkyl, C3-C6-cycloalkyl having 1 or 2 substituents which are selected independently of one another from the group consisting of halogen and C1-C3-alkyl, is C3-C6-cycloalkoxy-C1-C3-alkyl, C1-C6-alkoxy-C1-C6-alkyl, C1-C6-alkylthio-C1-C6-alkyl, C1-C6-alkoxycarbonyl-C1-C6-alkyl, C3-C6-alkenyl, C3-C6-alkynyl, amino, C1-C4-monoalkylamino, di-C1-C4-alkylamino or R6 together with R5 is a 5- or 6-membered heterocycle having 1, 2 or 3 heteroatoms which are selected independently of one another from the group consisting of N, O and S, and which is unsubstituted or has 1 or 2 substituents selected independently of one another from the group consisting of halogen, C1-C3-alkyl, C1-C3-alkoxy and C1-C3-haloalkyl;
• m is 0 or 1;
• n is 0, 1, 2 or 3;
• and salts thereof.