A microbicide having the general formula ##STR1## wherein R is a halomethyl radical, or a methylene radical; W is cyclohexyl, phenyl or meta or para substituted phenyl wherein the substituents are C.sub.1 -C.sub.4 alkyl, halogen or nitro; X and Y is hydrogen, C.sub.1 -C.sub.4 alkyl, halogen or nitro; provided that when R is halomethyl n is 1 and when R is methylene n is 0.