Compounds of formula: ##STR1## and stereoisomers thereof, wherein X, Y and Z, which are the same or different, are hydrogen, halogen, hydroxy, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted aryl, optionally substituted alkynyl, optionally substituted alkoxy, optionally substituted aryloxy, optionally substituted aralkyl, optionally substituted arylalkoxy, optionally substituted aryloxyalkyl, optionally substituted acyloxy, optionally substituted amino, acylamino, nitro, cyano, --CO.sub.2 R.sup.1, --CONR.sup.2 R.sup.3, or --COR.sup.4 ; or X and Y, when they are in adjacent positions of the phenyl ring, join to form a fused ring, either aromatic or aliphatic, optionally containing one or more heteroatoms; W is a C-linked optionally substituted five membered heterocylic ring, containing one to four hetero-atoms, which are the same or different, and which are nitrogen, sulphur or oxygen and wherein adjacent substituents may together form a fused aromatic or hetero-aromatic ring; A is an oxygen or sulphur atom; and R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which are the same or different, are hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, alkenyl, alkynyl, optionally substituted aryl or optionally substituted aralkyl; and metal complexes thereof. The compounds are useful as fungicides and also insecticides.