Compound of formula 1 wherein: R31 may be: H； CN； NO2； NO； SH； C1-C8 alkylthio； NH2； P (O) (OR8) (OR9) or R38； or mono (C1-C8 alkyl) amino； di (C1-C6 alkyl) amino； formyl； (C1-C8 alkyl)； C1-C20 alkyl； C3-C6 cycloalkyl； or (cycloalkyl) C4-C8 alkyl； wherein each alkyl or cycloalkyl is optionally substituted by one or more R35； or naphthyl or phenyl, each optionally substituted by one or more R36 or R37； or NH-CO-NH-N = CR8R9； NH-CS-NH-N = CR8R9； NH-CO-NR8R9； NH-CS-NR8R9； NH-CO-OR8； NH-CS-OR6； or NH-CO-NH-NH2； R35 may be halogen, amino, C1-C6 alkylamino, di (C1-C6 alkyl) amino, NO2, CN, C1-C6 alkoxy, (C1-C6 alkoxy) carbonyl, hydroxycarbonyl, (C1-C6 alkyl) carbonyl, methylene, methylidino, acetenyl, acetenyl (C1-C8 alkyl)； or R35 may be phenyl optionally substituted by one or more R36； or R39 may be a heterocyclic ring having a total of 3 to 7 ring atoms of which 1 to 4 are heteroatoms, said heteroatoms being the same or different and being selected from the group consisting of O, S and N, said heterocyclic ring being saturated or unsaturated and being optionally substituted by one or more R36； or R35 may be OH, SH, C1-C8 alkylthio, C1-C8 alkylsulfinyl, C1-C6 alkylsulfonyl, aminocarbonyl, (C1-C8 alkyl) aminocarbonyl, di (C1-C6 alkyl) aminocarbonyl, (C1-C6 alkoxy) carbonyl, or P (O) (OR8) (OR9)； R38 may be SF5, halogen, C1-C6 alkyl, hydroxy C1-C6 alkyl, NO2, CN, amino, C1-C6 alkylamino, di (C1-C6 alkyl) amino, di (C1-C6 alkyl) aminocarbonylamino, (C1- alkyl C6) aminocarbonylamino, aminocarbonylamino, (C1-C6 alkyl) carbonyl, (C1-C6 alkoxy) carbonyl, (C1-C6 alkyl) carbonylamino, (C1-C6 alkoxy) carbonylamino, aminocarbonyl, di (C1-C6 alkyl) aminocarbonyl, ( C1-C6 alkyl) aminocarbonyl, hydroxycarbonyl, aminocarbonyloxy, (C1-C6 alkyl) aminocarbonyloxy, di (C1-C6 alkyl) aminocarbonyloxy, hydroxy, C1-C6 alkoxy, C1-C6 haloalkyl, C1-C6 haloalkoxy, C1-C6 alkylthio, C1-C6 alkylsulfinyl, C1-C6 alkylsulfonyl, C1-C6 haloalkylthio, C1-C6 haloalkylsulfinyl, C1-C6 haloalkylsulfonyl, P (O
