The invention relates to novel compounds of the formula ##STR1## in which R.sub.1 is C.sub.1-4 alkyl and (Y--X) is CH.sub.2, C.sub.1-2 alkylthio-CH.dbd. or C.sub.1-2 alkyl-ON.dbd. and Z is an aldimino or ketimino group, and to their preparation, as well as fungicidal compositions with such compounds as active substances. The compounds can be employed for controlling fungi in agriculture, in horticulture and in wood preservation.