Compounds of formula: STR1 and stereoisomers thereof, wherein R1 and R2, which are the same or different, are optionally substituted alkyl; W, X, Y and Z, which are the same or different, are hydrogen, halogen, hydroxy, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted cycloalkylalkyl, optionally substituted aralkyl, optionally substituted aryloxyalkyl, optionally substituted alkenyl, optionally substituted aryl, optionally substituted alkynyl, optionally substituted amino, optionally substituted arylazo, optionally substituted heteroarylalkyl, optionally substituted heteroaryloxyalkyl, optionally substituted acylamino, nitro, cyano, --OR3, --SR3, --CO2 R4, --CONR5 R6, --COR7, --CR8 =NR9, --N=CR10 R11, --SOR12 or --SO2 R13, or any two of W, X, Y, and Z, in adjacent positions on the phenyl ring, optionally join to form an optionally substituted fused ring, either aromatic or aliphatic, optionally containing one or more heteroatoms; R3 is optionally substituted alkyl, or cycloalkyl optionally containing a hetero atom in the cycloalkyl ring, optionally substituted alkenyl, optionally substituted aryl, optionally substituted aralkyl, optionally substituted acyl, or optionally substituted heteroaryl; R4, R5, R6, R7, R8, R10 and R11, which are the same or different, are hydrogen or optionally substituted alkyl, optionally substituted cycloalkyl, cycloalkylalkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, or optionally substituted aralkyl; and R9, R12 and R13 are optionally substituted aryl or optionally substituted heteroaryl. The compounds are useful in agriculture as fungicides, plant growth regulators and insecticides.