A compound of formula: wherein A 1, A 2, A 3 and A 4 are independently of one another C-R 3, C-R 5 or nitrogen, provided that at least one of A 1, A 2, A 3 and A 4 is C-R 3 and no more than two of A 1, A 2, A 3 and A 4 are nitrogen; R 1 and R 2 are independently of each other hydrogen, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 alkylcarbonyl, hydroxy, C 1 -C 4 alkylcarbonyloxy, arylcarbonyloxy or arylcarbonyloxy wherein the aryl ring is substituted by one to five substituents independently selected from halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy or C 1 -C 4 haloalkoxy; G 1 and G 2 are independently of each other oxygen or sulfur; each R 3 is cyano; each R 5 is independently hydrogen, halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl or C 1 -C 4 alkoxy; Q 1 is aryl or aryl substituted by one to five substituents R 6, which may be the same or different, or Q 1 is heterocyclyl or heterocyclyl substituted by one to five substituents R 6, which may be the same or different; wherein each R 6 is independently cyano, nitro, hydroxy, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 4 alkoxy-C 1 -C 4 -alkyl, C 2 -C 6 alkenyl, C 2 -C 6 haloalkenyl, C 2 -C 6 alkynyl, C 2 -C 6 haloalkynyl, C 3 -C 6 cycloalkyl, C 3 -C 6 halocycloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 4 alkoxy-C 1 -C 4 -alkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 haloalkylsulfonyl, N -C 1 -C 6 alkylamino, N,N- di-(C 1 -C 6 alkyl)amino, N,N- di-(C 1 -C 6 alkyl)aminocarbonyl, N,N- di-(C 1 -C 6 alkyl)aminosulfonyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 alkylcarbonyloxy, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkylcarbonylamino, aryl or aryl which is substituted by one to five substituents independently selected from cyano, nitro, hydroxy, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy or C 1 -C 6 haloalkoxy, or heteroaryl or heteroaryl which is substituted by one to five substituents independently selected from cyano, nitro, hydroxy, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy or C 1 -C 6 haloalkoxy; and Q 2 is a moiety of formula wherein Y 1 and Y 5 are independently of each other cyano, halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy-C 1 -C 4 -alkyl, C 1 -C 3 alkylthio, C 1 -C 3 haloalkylthio, C 1 -C 3 alkylsulfinyl, C 1 -C 3 haloalkylsulfinyl, C 1 -C 3 alkylsulfonyl or C 1 -C 3 haloalkylsulfonyl; Y 3 is C 2 -C 6 perfluoroalkyl, C 1 -C 6 perfluoroalkylthio, C 1 -C 6 perfluoroalkylsulfinyl or C 1 -C 6 perfluoroalkylsulfonyl; Y 2 and Y 4 are independently of each other hydrogen, halogen or C 1 -C 4 alkyl; or a salt or N -oxide thereof. A 1, A 2, A 3 and A 4 are independently of one another C-R 3, C-R 5 or nitrogen, provided that at least one of A 1, A 2, A 3 and A 4 is C-R 3 and no more than two of A 1, A 2, A 3 and A 4 are nitrogen; R 1 and R 2 are independently of each other hydrogen, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 alkylcarbonyl, hydroxy, C 1 -C 4 alkylcarbonyloxy, arylcarbonyloxy or arylcarbonyloxy wherein the aryl ring is substituted by one to five substituents independently selected from halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy or C 1 -C 4 haloalkoxy; G 1 and G 2 are independently of each other oxygen or sulfur; each R 3 is cyano; each R 5 is independently hydrogen, halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl or C 1 -C 4 alkoxy; Q 1 is aryl or aryl substituted by one to five substituents R 6, which may be the same or different, or Q 1 is heterocyclyl or heterocyclyl substituted by one to five substituents R 6, which may be the same or different; wherein each R 6 is independently cyano, nitro, hydroxy, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 4 alkoxy-C 1 -C 4 -alkyl, C 2 -C 6 alkenyl, C 2 -C 6 haloalkenyl, C 2 -C 6 alkynyl, C 2 -C 6 haloalkynyl, C 3 -C 6 cycloalkyl, C 3 -C 6 halocycloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 4 alkoxy-C 1 -C 4 -alkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 haloalkylsulfonyl, N -C 1 -C 6 alkylamino, N,N- di-(C 1 -C 6 alkyl)amino, N,N- di-(C 1 -C 6 alkyl)aminocarbonyl, N,N- di-(C 1 -C 6 alkyl)aminosulfonyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 alkylcarbonyloxy, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkylcarbonylamino, aryl or aryl which is substituted by one to five substituents independently selected from cyano, nitro, hydroxy, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy or C 1 -C 6 haloalkoxy, or heteroaryl or heteroaryl which is substituted by one to five substituents independently selected from cyano, nitro, hydroxy, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy or C 1 -C 6 haloalkoxy; and Q 2 is a moiety of formula wherein Y 1 and Y 5 are independently of each other cyano, halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy-C 1 -C 4 -alkyl, C 1 -C 3 alkylthio, C 1 -C 3 haloalkylthio, C 1 -C 3 alkylsulfinyl, C 1 -C 3 haloalkylsulfinyl, C 1 -C 3 alkylsulfonyl or C 1 -C 3 haloalkylsulfonyl; Y 3 is C 2 -C 6 perfluoroalkyl, C 1 -C 6 perfluoroalkylthio, C 1 -C 6 perfluoroalkylsulfinyl or C 1 -C 6 perfluoroalkylsulfonyl; Y 2 and Y 4 are independently of each other hydrogen, halogen or C 1 -C 4 alkyl;