A compound of formula I, wherein A 1 is N, A 2 is CR 5 and R 5 is H, methyl, or (CH 2 CH 2 O) 2 CH-; R 1 is cyclopropyl-CH 2 -, CH≡CCH 2 -, H, or methyl; Q is phenyl, pyridine, pyrimidine, pyrazine or pyridazine, wherein the phenyl, pyridine, pyrimidine, pyrazine or pyridazine is substituted by R 2 where n is 1 or 2, and, independent of the type of ring, is optionally substituted with R Y, where m can be 0, 1 or 2; R 2 is C 3 -C 6 cycloalkyl, phenyl or heteroaryl, each of which, independent of each other, is optionally substituted with one to three substituents independently selected from R x; OR 6; piperidin-2-one-1-yl optionally substituted with one to two substituents independently selected from R x; pyridin-2-one-1-yl optionally substituted with one to two substituents independently selected from R x; azetidin-1-yl optionally substituted with one to two substituents independently selected from R x; pyrrolidin-1-yl optionally substituted with one to two substituents independently selected from R x; C 3 -C 6 cycloalkylC 1 -C 4 alkyl optionally substituted with one to two substituents independently selected from R x; C 3 -C 6 cycloalkylC 1 -C 3 alkoxy optionally substituted with one to two substituents independently selected from R x; C 1 -C 5 cyanoalkyl; C 1 -C 5 cyanoalkoxy; C 1 -C 4 alkylsulfonyl optionally substituted with one to two substituents independently selected from R x; or C 1 -C 4 alkylsulfinyl optionally substituted with one to two substituents independently selected from R x; R Y is selected from 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, halo, NO 2, SF 5, CN, C NH 2, C OH and C NH 2; R 3 is methyl; R 4 is 2-pyridine or 2-pyrimidine, each optionally substituted with C 1 -C 3 alkoxy or halogen; R 6 is phenyl, benzyl, heteroaryl, or C 3 -C 6 cycloalkyl, each of which, independent of each other, is optionally substituted with one to three substituents independently selected from R x; and R x is independently selected from halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, NO 2, SF 5, CN, CONH 2, C NH 2, 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 and C 1 -C 4 alkylsulfonyl; or agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I. wherein A 1 is N, A 2 is CR 5 and R 5 is H, methyl, or (CH 2 CH 2 O) 2 CH-; R 1 is cyclopropyl-CH 2 -, CH≡CCH 2 -, H, or methyl; Q is phenyl, pyridine, pyrimidine, pyrazine or pyridazine, wherein the phenyl, pyridine, pyrimidine, pyrazine or pyridazine is substituted by R 2 where n is 1 or 2, and, independent of the type of ring, is optionally substituted with R Y, where m can be 0, 1 or 2; R 2 is C 3 -C 6 cycloalkyl, phenyl or heteroaryl, each of which, independent of each other, is optionally substituted with one to three substituents independently selected from R x; OR 6; piperidin-2-one-1-yl optionally substituted with one to two substituents independently selected from R x; pyridin-2-one-1-yl optionally substituted with one to two substituents independently selected from R x; azetidin-1-yl optionally substituted with one to two substituents independently selected from R x; pyrrolidin-1-yl optionally substituted with one to two substituents independently selected from R x; C 3 -C 6 cycloalkylC 1 -C 4 alkyl optionally substituted with one to two substituents independently selected from R x; C 3 -C 6 cycloalkylC 1 -C 3 alkoxy optionally substituted with one to two substituents independently selected from R x; C 1 -C 5 cyanoalkyl; C 1 -C 5 cyanoalkoxy; C 1 -C 4 alkylsulfonyl optionally substituted with one to two substituents independently selected from R x; or C 1 -C 4 alkylsulfinyl optionally substituted with one to two substituents independently selected from R x; R Y is selected from 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, halo, NO 2, SF 5, CN, C NH 2, C OH and C NH 2; R 3 is methyl; R 4 is 2-pyridine or 2-pyrimidine, each optionally substituted with C 1 -C 3 alkoxy or halogen; R 6 is phenyl, benzyl, heteroaryl, or C 3 -C 6 cycloalkyl, each of which, independent of each other, is optionally substituted with one to three substituents independently selected from R x; and R x is independently selected from halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, NO 2, SF 5, CN, CONH 2, C NH 2, 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 and C 1 -C 4 alkylsulfonyl; or agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I.