A compound of formula wherein A 1, A 2, A 3 and A 4 are each independently C-X or nitrogen, wherein each X may be the same or different, and provided that no more than two of A 1, A 2, A 3 and A 4 are nitrogen; X is hydrogen, halogen, cyano, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl or C 1 -C 4 alkoxy; G 1 and G 2 are each independently oxygen or sulfur; Y 1 and Y 4 are each independently halogen, cyano, 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 2 and Y 3 are each independently hydrogen, halogen or C 1 -C 4 alkyl; Q 1 is aryl or heterocyclyl, each optionally substituted by one to five R 3 substituents, which may be the same or different; Q 2 is aryl or heterocyclyl, each optionally substituted by one to five R 4 substituents, which may be the same or different; R 1 and R 2 are each independently hydrogen, C 1 -C 4 alkyl or C 1 -C 4 alkylcarbonyl; R 3 is halogen, cyano, nitro, amino, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 2 -C 4 alkenyl, C 2 -C 4 haloalkenyl, C 2 -C 4 alkynyl, C 2 -C 4 haloalkynyl, C 3 -C 8 cycloalkyl, C 3 -C 8 halocycloalkyl, hydroxy, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, 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, C 1 -C 3 haloalkylsulfonyl, N- C 1 -C 4 alkylamino, N,N- di-(C 1 -C 4 alkyl)amino, C 1 -C 4 alkylcarbonyl, C 1 -C 4 alkylcarbonyloxy, C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkylcarbonylamino, arylcarbonylamino or phenyl; R 4 is halogen, cyano, nitro, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 2 -C 4 alkenyl, C 2 -C 4 haloalkenyl, C 2 -C 4 alkynyl, C 2 -C 4 haloalkynyl, C 3 -C 8 cycloalkyl, C 3 -C 8 halocycloalkyl, hydroxy, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, 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, C 1 -C 3 haloalkylsulfonyl, amino, C 1 -C 4 alkylamino, N, N -di-(C 1 -C 4 alkyl)amino, carboxyl (-COOH), C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkylcarbonylamino, N-C 1 -C 4 alkylaminocarbonyl, N,N-di(C 1 -C 4 alkyl)aminocarbonyl; and R 5 is C 1 -C 6 perfluoroalkyl; or a salt or N- oxide thereof; provided that the compound is not A 1, A 2, A 3 and A 4 are each independently C-X or nitrogen, wherein each X may be the same or different, and provided that no more than two of A 1, A 2, A 3 and A 4 are nitrogen; X is hydrogen, halogen, cyano, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl or C 1 -C 4 alkoxy; G 1 and G 2 are each independently oxygen or sulfur; Y 1 and Y 4 are each independently halogen, cyano, 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 2 and Y 3 are each independently hydrogen, halogen or C 1 -C 4 alkyl; Q 1 is aryl or heterocyclyl, each optionally substituted by one to five R 3 substituents, which may be the same or different; Q 2 is aryl or heterocyclyl, each optionally substituted by one to five R 4 substituents, which may be the same or different; R 1 and R 2 are each independently hydrogen, C 1 -C 4 alkyl or C 1 -C 4 alkylcarbonyl; R 3 is halogen, cyano, nitro, amino, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 2 -C 4 alkenyl, C 2 -C 4 haloalkenyl, C 2 -C 4 alkynyl, C 2 -C 4 haloalkynyl, C 3 -C 8 cycloalkyl, C 3 -C 8 halocycloalkyl, hydroxy, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, 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, C 1 -C 3 haloalkylsulfonyl, N- C 1 -C 4 alkylamino, N,N- di-(C 1 -C 4 alkyl)amino, C 1 -C 4 alkylcarbonyl, C 1 -C 4 alkylcarbonyloxy, C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkylcarbonylamino, arylcarbonylamino or phenyl; R 4 is halogen, cyano, nitro, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 2 -C 4 alkenyl, C 2 -C 4 haloalkenyl, C 2 -C 4 alkynyl, C 2 -C 4 haloalkynyl, C 3 -C 8 cycloalkyl, C 3 -C 8 halocycloalkyl, hydroxy, C 1 -C 3 alkoxy, C 1 -C 3 haloalkoxy, 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, C 1 -C 3 haloalkylsulfonyl, amino, C 1 -C 4 alkylamino, N, N -di-(C 1 -C 4 alkyl)amino, carboxyl (-COOH), C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkylcarbonylamino, N-C 1 -C 4 alkylaminocarbonyl, N,N-di(C 1 -C 4 alkyl)aminocarbonyl; and R 5 is C 1 -C 6 perfluoroalkyl;