Cycloalkyl carboxylic acid amides, their production and their use as fungicides in agriculture

A cycloalkylcarboxamide of the formula Ia

• where:
• Alk is straight-chain or branched C1-C6-alkylene;
• R1 is C1-C6-alkyl or C2-C6-alkenyl, where these radicals may be partially or fully halogenated and/or may carry one or two of the following groups:
• C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C1-C4-alkoxycarbonyl, C3-C6-cycloalkyl and phenyl, where the phenyl may be partially or fully halogenated and/or may carry one to three of the following radicals:
• nitro, cyano, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C3-C6-cycloalkyl or heterocyclyl;
• R2, R3 are hydrogen, C1-C6-alkyl or C2-C6-alkenyl, where these radicals may be partially or fully halogenated;
• W is a fused bicyclic ring system having in each case six ring atoms, where one or two carbon ring atoms may be replaced by nitrogen atoms, and where these ring systems may carry one to three of the following groups:
• nitro, halogen, cyano, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C3-C6-cycloalkyl and C1-C4-alkoxycarbonyl;
• R4 is hydrogen, halogen, cyano, C1-C6-alkyl, C2-C6-alkenyl, C1-C6-alkoxy or C1-C6-alkylthio, where these radicals may be partially or fully halogenated and/or may carry one or two of the following groups:
• C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C1-C4-alkoxycarbonyl, C3-C6-cycloalkyl, C1-C6-alkoxycarbonylamino;
• R5 is hydrogen, halogen, cyano, C1-C6-alkyl, C2-C6-alkenyl, C1-C6-alkoxy or C1-C6-alkylthio, where these radicals may be partially or fully halogenated and/or may carry one or two of the following groups:
• C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C1-C4-alkoxycarbonyl, C3-C6-cycloalkyl, C1-C4-alkoxycarbonylamino;
• R6 is hydrogen, halogen or C1-C6-alkyl;
• R7 is hydrogen, halogen or C1-C6-alkyl;
• R8 is hydrogen, halogen or C1-C6-alkyl,
• and their agriculturally useful salts.