The invention relates to novel triazolopyrimidines of the formula ##STR00001## in which R.sup.1, R.sup.2, R.sup.3 and X have the meanings given in the disclosure, and acid addition salts thereof, to a plurality of processes for preparing these novel substances, and to their use for controlling unwanted microorganisms. The invention further relates to novel amines and carbamates of the formulae indicated in the description and to processes for preparing these intermediates.