Fungicides

A compound having the formula (I):

• ##STR104## in which any two of K, L and M are nitrogen and the other is CH;
• and X is an optionally substituted 3- to 6-membered heterocyclic ring containing at least one trivalent nitogen atom by which it is attached to the central pyrimidine ring;
• the optionaly substituted heterocyclic ring being selected from the group consisting of pyrrole, imidazole, 1,2,4-triazole, 1,2,3-triazole, 1,3,4-triazole, pyridone, aziidine, aetidine, pyrrolidine, and piperidine, and the substituents being selected from the group consisting of halogen, C.sub.1-4 alkyl, C.sub.3-6 cycloalkyl, C.sub.2-4 alkenyl, C.sub.2-4 alkynyl, C.sub.2-4 alkenyloxy, C.sub.2-4 alkynyloxy, phenyl, benzyloxy, cyano, ixocyano, isorthiocyanato, nitro, oxo, NR.sup.1 R.sup.2, NHCOR.sup.1, NHCONR.sup.1 R.sup.2, NHSO.sub.2 R.sup.1, OR.sup.1, OCOR.sup.1, OSO.sub.2 R.sup.1, SR.sup.1, SOR.sup.1, SO.sub.2 R.sup.1, COR.sup.1, CR.sup.1 =NOR.sup.2, CO.sub.2 R.sup.1, CONR.sup.1 R.sup.2 and CSNR.sup.1 R.sup.2, wherein R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-4 alkyl or phenyl, and wherein the aliphatic moieties of any of the substituents are substituted with one or more of halogen, cyano, OR.sup.1 or OCOR.sup.1 and the phenyl moieties of any of the substituents being substituted with one or more of halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, nitro or cyano;
• or any two substituents, when ortho to one another, join to form a benzene ring and wherein the benzene ring may further be substituted with the substituents recited above for the substituted heterocyclic ring.