The invention is concerned with novel triazole derivatives of the formula ##STR1## wherein R.sup.1 is optionally substituted phenyl and R.sup.2 signifies substituted phenyl, as more precisely defined in the description, and R.sup.3 is halogen, methyl or halomethyl, and their acid addition salts, processes for their preparation, pest control compositions which contain these compounds as the active substance, as well as methods of use of such compounds or compositions for the control of pests.