FUNGICIDES

This invention relates to the use as plant fungicides of certain coumarin, quinolinone and benzothiinone derivatives and the corresponding thiones. It also relates to plant fungicidal compositions containing these compounds and to certain of the compounds themselves. The use as a plant fungicide of a compound of the general formula (I): wherein M, L and K are independently O, S(O)n where n is 0, 1 or 2, NR5 or CHR6, provided that at least one is CHR6, that when two are O, L is CHR6 and that when two are NR5 or two or three are CHR6, the values of R5 and the values of R6 are the same or different; X is hydroxy, cyclohexanon-2-yloxy, C1-6 alkylcarbonyloxy, halo (C1-6)-alkylcarbonyloxy, C1-6 alkoxycarbonyloxy, C1-6 alkoxycarbonyl (C1-6) alkoxy, halo(C1-6)alkoxycarbonyloxy, C1-6 alkoxycarbonyl(phenyl)(C1-6)alkoxy, cyclo(C3-6)-alkylcarbonyloxy, arylcarbonyloxy, heterocyclylcarbonyloxy, arylcarbonyl-(C1-6)alkoxy, aryl(C1-6)alkoxycarbonyl(C1-6)alkoxy, aminocarbonyloxy, mono- or di-(C1-6)alkyl-aminocarbonyloxy, C1-6 alkoxycarbonylcarbonyloxy, C1-6 alkyl-sulphonyloxy, haloalkylsulphonyloxy, arylsulphonyloxy, heterocyclylsulphonyloxy, di-(C1-4)alkoxyphosphonyloxy, dihydroxyphosphonyloxy, cyano(C1-6)alkoxy, carboxy(C1-6)alkoxy, carboxyhalo(C1-6)alkoxy, C1-6alkylcarbonyl(C1-6)alkoxy, C1-6 alkoxycarbonyl(C1-6)alkoxy, C1-6 alkoxycarbonylhalo(C1-6)alkoxy, aminocarbonyl-(C1-6)alkoxy, mono- or di-(C1-6)alkylaminocarbonyl(C1-6)alkoxy, hydrazinocarbonyl-(C1-6)alkoxy, amino, C1-6 alkylcarbonylamino, C1-6 alkoxycarbonylamino or C1-6 alkylsulphonylamino or X may be H when R4 is hydroxy, oxo, hydroximino, amino, mono-or-di-(C1-6)alkylamino, C1-6 alkylcarbonylamino or C1-6 alkylsulphonylamino; Y is O, S or NR7; Z is O or S; R1, R2 and R3 are independently H, halo, hydroxy, C1-14alkyl, halo(C1-8)alkyl, hydroxy(C1-8)alkyl, C1-8alkoxy, halo(C1-8)alkoxy, C1-6 alkoxy(C1-6)alkoxy, C1-6alkoxy(C1-6)alkoxy(C1-6)alkoxy, cyclo(C3-6)alkyl, C1-4alkyl-cyclo(C3-6)alkyl, cyclo(C3-6)-alkoxy, C2-6alkenyl, C2-12alkenyloxy, C2-6alkynyl, C2-6 alkynyloxy, C1-6alkoxycarbonyl, C1-6alkylcarbonyloxy(C1-8)alkyl, C1-6alkoxy-carbonyl(C1-8)alkyl, C1-6alkoxycarbonyl(C1-8)alkoxy, carboxy(C1-6)alkoxy, cyano, nitro, aryl, heterocyclyl, aryloxy, heterocyclyloxy, aryl(C1-10)alkyl or heterocyclyl-(C1-4)alkyl, or R1 and R2 or R2 and R3 join to form optionally C1-6 alkyl substituted C2-4 alkylenedioxy; R4 and R6 are independently H, hydroxy, oxo, hydroximino, amino, mono-or-di-(C1-6)alkylamino, C1-6alkylcarbonylamino,