A compound of the formula I wherein: Q is A 1, A 2, A 3 and A 4 are independently CR 5 or N, provided not more than three of A 1, A 2, A 3 and A 4 are N; R 1 is hydrogen, 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- wherein the C 3 -C 4 cycloalkyl is optionally substituted with 1 or 2 halo atoms; oxetan-3-yl-CH 2 -; or benzyl optionally substituted with halo or C 1 -C 6 haloalkyl; R 2 is phenyl, pyridine, pyrimidine, pyrazine or pyridazine, wherein the phenyl, pyridine, pyrimidine, pyrazine or pyridazine is optionally substituted with one to three substituents, provided the substituent(s) are not on either carbon adjacent to the carbon C=O is attached, and each substituent is independently selected from: C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 thiohaloalkyl, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, halogen, NO 2, SF 5, CN, CONH 2, COOH and C NH 2; R 3 is C 1 -C 3 alkyl or C 1 -C 3 haloalkyl; R 4 is pyridine, pyrimidine, pyrazine or pyridazine, wherein the pyridine, pyrimidine, pyrazine or pyridazine is optionally substituted with one to three substituents, independently selected from C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 alkoxy, C 3 -C 4 cycloalkyl, halogen or hydroxy; R 5 is hydrogen, halogen, CN, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 3 -C 4 cycloalkyl, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, C 1 -C 3 alkoxycarbonyl, or di(C 1 -C 3 alkoxy)methane; with the proviso that R 4 is not pyridin-3-yl, if A 1, A 2, A 3 and A 4 are all CH; or a stereoisomer, enantiomer, tautomer and N-oxide of the compound of formula I, or agrochemically acceptable salt thereof. Q is A 1, A 2, A 3 and A 4 are independently CR 5 or N, provided not more than three of A 1, A 2, A 3 and A 4 are N; R 1 is hydrogen, 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- wherein the C 3 -C 4 cycloalkyl is optionally substituted with 1 or 2 halo atoms; oxetan-3-yl-CH 2 -; or benzyl optionally substituted with halo or C 1 -C 6 haloalkyl; R 2 is phenyl, pyridine, pyrimidine, pyrazine or pyridazine, wherein the phenyl, pyridine, pyrimidine, pyrazine or pyridazine is optionally substituted with one to three substituents, provided the substituent(s) are not on either carbon adjacent to the carbon C=O is attached, and each substituent is independently selected from: C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 thiohaloalkyl, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, halogen, NO 2, SF 5, CN, CONH 2, COOH and C NH 2; R 3 is C 1 -C 3 alkyl or C 1 -C 3 haloalkyl; R 4 is pyridine, pyrimidine, pyrazine or pyridazine, wherein the pyridine, pyrimidine, pyrazine or pyridazine is optionally substituted with one to three substituents, independently selected from C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 alkoxy, C 3 -C 4 cycloalkyl, halogen or hydroxy; R 5 is hydrogen, halogen, CN, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 3 -C 4 cycloalkyl, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, C 1 -C 3 alkoxycarbonyl, or di(C 1 -C 3 alkoxy)methane; with the proviso that R 4 is not pyridin-3-yl, if A 1, A 2, A 3 and A 4 are all CH; or a stereoisomer, enantiomer, tautomer and N-oxide of the compound of formula I, or agrochemically acceptable salt thereof.