Triazolyl derivatives ##STR1## in which R.sup.1 and R.sup.2 are identical or different and represent optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkyl, optionally substituted aralkyl, optionally substituted aralkenyl, optionally substituted aroxyalkyl, optionally substituted aryl or optionally substituted heteroaryl and X represents the groups --SH, --SR.sup.3, --SO--R.sup.3, --SO.sub.2 --R.sup.3 or --SO.sub.3 H, in which R.sup.3 represents alkyl which is optionally substituted by fluorine and/or chlorine, alkenyl which is optionally substituted by fluorine and/or chlorine, optionally substituted aralkyl or optionally substituted aryl, and their acid addition salts and metal salt complexes, a plurality of processes for the preparation of the new substances, and their use as microbicides in plant protection and materials protection.