Compounds of formula (I): ##STR1## and stereoisomers thereof, wherein W is R.sup.1 O.sub.2 C--C.dbd.CH--ZR.sup.2, wherein R.sup.1 and R.sup.2, which are the same or different, are alkyl or fluoroalkyl groups, and Z is either an oxygen or sulphur atom; A is an oxygen or sulphur atom, --NR.sup.3 --, or --CR.sup.4 R.sup.5 --; X, Y and Z.sup.1, which are the same or different, are hydrogen or halogen atoms, or hydroxy, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted cycloalkylalkyl, optionally substituted aralkyl, optionally substituted heteroarylalkyl, optionally substituted aryloxyalkyl, optionally substituted heteroaryloxyalkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted alkoxy, optionally substituted arylalkoxy, optionally substituted aryloxy, optionally substituted heteraryloxy, optionally substituted acyloxy, optionally substituted amino, optionally substituted acylamino, optionally substituted arylazo, nitro, cyano, --CO.sub.2 R.sup.6, --CONR.sup.7 R.sup.8, --COR.sup.9 --CR.dbd.NR.sup.10, --CR.dbd.NOR.sup.10 or --N.dbd.CR.sup.11 R.sup.12 groups; or the groups X and Y, when they are in adjacent positions on the ring, optionally join to form a fused ring, either aromatic or aliphatic, optionally containing one or more heteroatoms; and R, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11 and R.sup.12, which are the same or different, are hydrogen atoms (provided that R.sup.4 and R.sup.5 are not hydrogen) or optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted cycloalkylalkyl, optionally substituted aralkyl, optionally substituted heterarylalkyl, optionally substituted aryloxyalkyl, optionally substituted heteroaryloxyalkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl or optionally substituted heteroaryl groups; and metal compelxes thereof.The compounds are useful in agriculture, especially as fungicides but also as insecticides and plant growth regulators.