Arylpyroline compounds of formula (I) ** Formula ** in which G is 5 selected from the group consisting of the optionally substituted 5-membered heterocyclic groups G1 to G9: in which Z each independently represents halogen, haloalkyl C1-12 optionally substituted； nitro； optionally substituted C1-12 alkoxy； cyano； optionally substituted C1-12 haloalkoxy, C1-12 alkylsulfenyl, C1-12 alkylsulfinyl, C1-12 alkylsulfonyl, C1-12 haloalkylsulfenyl, C1-12 haloalkylsulfinyl, C1-12 haloalkylsulfonyl； hydroxyl or thiol； k represents 0, 1, 2, 3 or 4； R represents optionally substituted C1-12 alkyl or C1-12 haloalkyl； A1, A2, A3 and A4 each independently represent a C-Y group； or nitrogen, with the proviso that only 2 of the chemical groups A1, A2, A3 and A4 can represent nitrogen at the same time； or if A1 and A2 represent both C-Y, then both Y, together with the carbon atoms to which they are attached, can form a 5- or 6-membered aromatic ring； B1, B2 and B3 each independently represent a C-X group； or nitrogen with the proviso that only 2 of the chemical groups B1, B2 and B3 can represent nitrogen at the same time； X each independently represents hydrogen； halogen； optionally substituted C1-12 haloalkyl； nitro； optionally substituted C1-12 alkyl, C1-12 alkoxy, cyano, optionally substituted C1-12 haloalkoxy, C1-12 alkylsulfenyl, C1-12 alkylsulfinyl, C1-12 alkylsulfonyl, C1-12 haloalkylsulfenyl, C1-12 haloalkylsulfinyl, C1-12 haloalkylsulfonyl ； hydroxyl, thiol； Not me； optionally substituted C1-12 acylamino, C1-12 alkoxycarbonylamino, C1-12 haloalkylcarbonylamino, C1-12 alkoxyimino, C1-12 haloalkoxyimino, C1-12 alkylsulfonylamino； or sulfur pentafluoride； And each independently represents hydrogen； halogen； optionally substituted C1-12 haloalkyl； nitro； optionally substituted C1-12 alkyl, C3-8 cycloalkyl, C3-8 cyclohaloalkyl, C1-12 alkoxy； cyano, optionally substituted C1-12 haloalkoxy, C1-12 alkylsulfenyl, C1-12 alkylsulfinyl, C1-12 alkylsulfonyl, C1-12 haloalkylsulfenyl, C1-12
