Novel halogenoalkenyl-azolyl derivatives of the formula ##STR1## in which R.sup.1 represents optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkyl, optionally substituted aryl or represents optionally substituted heteroaryl, R.sup.2 represents alkyl, halogenoalkyl, 1-hydroxyalkyl, 2-hydroxyalkyl, 1-hydroxyhalogenalkyl, 1-alkenyl or 2-alkenyl, X.sup.1 represents fluorine, chlorine, bromine or iodine, X.sup.2 represents fluorine, chlorine, bromine or iodine, and Y represents nitrogen or a CH group, and addition products thereof with acids or metal salts are very active as microbicides in plant protection and in the protection of materials.