A compound of the formula I wherein A 1 is N or C-R 2c; R 2c is H, halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 alkoxy, or C 1 -C 3 haloalkoxy; R 2a is C 3 -C 6 cycloalkyl; C 3 -C 6 cycloalkyl substituted with one to three substituents independently selected from C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, cyano, and halogen; C 3 -C 6 cycloalkylC 1 -C 4 alkyl; C 3 -C 6 cycloalkylC 1 -C 4 alkyl substituted with one to five substituents independently selected from C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, cyano, and halogen; C 1 -C 5 cyanoalkyl; C 3 -C 6 cycloalkoxy; C 1 -C 4 alkylsulfonyl; C 1 -C 4 haloalkylsulfonyl; C 1 -C 4 alkylsulfinyl; or C 1 -C 4 haloalkylsulfinyl; R 2b is H, halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 haloalkylthio, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, SFs, or CN; A 2 is CR 4b or N; R 4b is hydrogen, or halogen; R 4a is cyano, or C 1 -C 3 haloalkoxy; R 1 is H, C 1 -C 6 alkyl, C 1 -C 6 cyanoalkyl, aminocarbonylC 1 -C 6 alkyl, hydroxycarbonylC 1 -C 6 alkyl, C 1 -C 6 nitroalkyl, trimethylsilaneC 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 2 -C 6 alkenyl, C 2 -C 6 haloalkenyl, C 2 -C 6 alkynyl, C 2 -C 6 haloalkynyl, C 3 -C 4 cycloalkylC 1 -C 2 alkyl-, C 3 -C 4 cycloalkylC 1 -C 2 alkyl- wherein the C 3 -C 4 cycloalkyl group is substituted with 1 or 2 halo atoms, oxetan-3-yl-CH 2 -, benzyl or benzyl substituted with halo or C 1 -C 6 haloalkyl; R 3 is C 1 -C 3 alkyl or C 1 -C 3 haloalkyl; R 5 is halogen, amino, (C 1 -C 3 alkyl)amino, hydroxy, cyano, C 3 -C 4 halocycloalkyl, C 2 -C 6 haloalkenyl, C 1 -C 4 haloalkylsulfanyl, C 1 -C 4 haloalkylsulfinyl, C 1 -C 4 haloalkylsulfonyl, C 1 -C 4 alkylsulfanyl, C 1 -C 4 alkylsulfinyl, C 1 -C 4 alkylsulfonyl, (C 1 -C 3 alkyl)sulfonylamino, (C 1 -C 3 alkyl)sulfonyl(C 1 -C 3 alkyl)amino, (C 1 -C 3 alkyl)NHC, (C 1 -C 3 alkyl) 2 NC, (C 3 -C 6 cycloalkyl)NHC, (C 3 -C 6 cycloalkyl)(C 1 -C 3 alkyl)NC, (C 1 -C 3 alkyl)C (C 1 -C 3 alkyl)N, (C 1 -C 3 alkyl)C NH, diphenylmethanimine, or C 1 -C 3 haloalkoxy; or agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I. A 1 is N or C-R 2c; R 2c is H, halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 alkoxy, or C 1 -C 3 haloalkoxy; R 2a is C 3 -C 6 cycloalkyl; C 3 -C 6 cycloalkyl substituted with one to three substituents independently selected from C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, cyano, and halogen; C 3 -C 6 cycloalkylC 1 -C 4 alkyl; C 3 -C 6 cycloalkylC 1 -C 4 alkyl substituted with one to five substituents independently selected from C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, cyano, and halogen; C 1 -C 5 cyanoalkyl; C 3 -C 6 cycloalkoxy; C 1 -C 4 alkylsulfonyl; C 1 -C 4 haloalkylsulfonyl; C 1 -C 4 alkylsulfinyl; or C 1 -C 4 haloalkylsulfinyl; R 2b is H, halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 haloalkylthio, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, SFs, or CN; A 2 is CR 4b or N; R 4b is hydrogen, or halogen; R 4a is cyano, or C 1 -C 3 haloalkoxy; R 1 is H, C 1 -C 6 alkyl, C 1 -C 6 cyanoalkyl, aminocarbonylC 1 -C 6 alkyl, hydroxycarbonylC 1 -C 6 alkyl, C 1 -C 6 nitroalkyl, trimethylsilaneC 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 2 -C 6 alkenyl, C 2 -C 6 haloalkenyl, C 2 -C 6 alkynyl, C 2 -C 6 haloalkynyl, C 3 -C 4 cycloalkylC 1 -C 2 alkyl-, C 3 -C 4 cycloalkylC 1 -C 2 alkyl- wherein the C 3 -C 4 cycloalkyl group is substituted with 1 or 2 halo atoms, oxetan-3-yl-CH 2 -, benzyl or benzyl substituted with halo or C 1 -C 6 haloalkyl; R 3 is C 1 -C 3 alkyl or C 1 -C 3 haloalkyl; R 5 is halogen, amino, (C 1 -C 3 alkyl)amino, hydroxy, cyano, C 3 -C 4 halocycloalkyl, C 2 -C 6 haloalkenyl, C 1 -C 4 haloalkylsulfanyl, C 1 -C 4 haloalkylsulfinyl, C 1 -C 4 haloalkylsulfonyl, C 1 -C 4 alkylsulfanyl, C 1 -C 4 alkylsulfinyl, C 1 -C 4 alkylsulfonyl, (C 1 -C 3 alkyl)sulfonylamino, (C 1 -C 3 alkyl)sulfonyl(C 1 -C 3 alkyl)amino, (C 1 -C 3 alkyl)NHC, (C 1 -C 3 alkyl) 2 NC, (C 3 -C 6 cycloalkyl)NHC, (C 3 -C 6 cycloalkyl)(C 1 -C 3 alkyl)NC, (C 1 -C 3 alkyl)C (C 1 -C 3 alkyl)N, (C 1 -C 3 alkyl)C NH, diphenylmethanimine, or C 1 -C 3 haloalkoxy; or agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I.