Combating fungi with azolylvinyldithioacetals

Claim 1

An azolylvinyldithioacetal of the formula ##STR59## in which R 1 is an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 7 carbon atoms and optionally substituted by alkyl having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a phenyl group optionally substituted with at least one substituent selected from halogen, alkyl, alkoxy and alkylthio each having 1 to 4 carbon atoms, halogenoalkyl, halogenoalkylthio each having 1 or 2 carbon atoms and up to 5 identical or different halogen atoms and phenoxy and phenyl optionally substituted by halogen and/or by alkyl having 1 or 2 carbon atoms; and R 2 and R 3 both are an alkyl group having 1 to 4 carbon atoms; an alkenyl or alkinyl group each having 2 to 6 carbon atoms; a benzyl group optionally substituted on the phenyl ring by at least one of halogen, alkyl, alkoxy and alkylthio each having 1 to 4 carbon atoms, halogenoalkyl, halogenoalkoxy and halogenoalkylthio each having 1 or 2 carbon atoms and up to 5 identical or different halogen atoms, and phenoxy and phenyl optionally substituted by halogen and/or by alkyl having 1 or 2 carbon atoms; or a trialkylsilyl group having 1 to 4 carbon atoms in each alkyl part; or R 2 and R 3 together form an alkylene chain having 1 to 4 carbon atoms, a dialkylsilyl bridge having 1 to 4 carbon atoms in each alkyl part, or a --CH═CH-- group, X is a keto group or a CH--(OH) group, and Y is a nitrogen atom or a CH group, or an addition product thereof with an acid or metal salt.