Pesticidally active diazine-amide compounds

A compound of the formula I

• wherein
• R1 is H, C1-C6alkyl, C1-C6cyanoalkyl, aminocarbonylC1-C6alkyl, hydroxycarbonylC1-C6alkyl, C1-C6nitroalkyl, trimethylsilaneC1-C6alkyl, C1-C6haloalkyl, C2-C6alkenyl, C2-C6haloalkeny, C2-C6alkynyl, C2-C6haloalkynyl, C3-C4cycloalkylC1-C2alkyl-, C3-C4cycloalkylC1-C2alkyl- wherein the C3-C4cycloalkyl group is substituted with 1 or 2 halogen atoms, oxetan-3-yl-CH2-, benzyl or benzyl substituted with halogen or C1-C6haloalkyl;
• A1 is N or C—R2c;
• R2c is H, halogen, C1-C3alkyl, C1-C3haloalkyl, C1-C3alkoxy, or C1-C3haloalkoxy;
• R2a is C3-C6cycloalkyl, C3-C6cycloalkoxy, C3-C6cycloalkyl substituted with one to three substituents independently selected from C1-C3alkyl, C1-C3haloalkyl, C1-C3alkoxy, cyano, and halogen, C3-C6cycloalkoxy substituted with one to three substituents independently selected from C1-C3alkyl, C1-C3haloalkyl, cyano, and halogen, C3-C6cycloalkylC1-C4alkyl, C3-C6cycloalkylC1-C4alkoxy, C3-C6cycloalkylC1-C4alkyl substituted with one to five substituents independently selected from C1-C3alkyl, C1-C3haloalkyl, C1-C3alkoxy, cyano, and halogen, C3-C6cycloalkylC1-C4alkoxy substituted with one to five substituents independently selected from C1-C3alkyl, C1-C3haloalkyl, cyano, and halogen, C1-C5cyanoalkyl, C1-C4alkylsulfonyl, C1-C4haloalkylsulfonyl, C1-C4alkylsulfinyl, or C1-C4haloalkylsulfinyl;
• R2b is H, halogen, C1-C3alkyl, C1-C3haloalkyl, C1-C3haloalkylthio, C1-C3alkoxy, C1-C3haloalkoxy, SF5, or CN;
• R3 is C1-C3alkyl or C1-C3haloalkyl;
• R4 is pyridine, pyrimidine, pyrazine, pyridazine, substituted pyridine, substituted pyrimidine, substituted pyrazine, or substituted pyridazine, wherein each of the substituted pyridine, the substituted pyrimidine, the substituted pyrazine, or the substituted pyridazine is independently substituted with one substituent selected from C1-C3alkyl, C1-C3haloalkyl, C1-C3alkoxy, C3-C4cycloalkyl, halogen and hydroxy;
• R5a and R5b are, independently of each other, selected from hydrogen, halogen, CN, C1-C3alkyl, C1-C3haloalkyl, C3-C4cycloalkyl, C1-C3alkoxy, and C1-C3haloalkoxy;
• or
• agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I.