The invention relates to triazolopyrimidines of formula (I), in which the substituents are defined as follows: L.sup.1 represents cyano, S(.dbd.O).sub.nA.sup.1 or C(.dbd.O)A.sup.2, wherein A.sup.1 stands for hydrogen, hydroxy, alkyl, alkylamino or dialkylamino; A.sup.2 stands for C.sub.1 C.sub.8 alkoxy, C.sub.1 C.sub.6 haloalkoxy or one of the groups named in A.sup.1; and n stands for 0, 1 or 2; L.sup.2, L.sup.3 represent hydrogen or halogen; L.sup.4, L.sup.5 represent hydrogen, halogen or alkyl; X represents halogen, cyano, alkyl, haloalkyl, alkoxy or haloalkoxy; R.sup.1 represents alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkenyl, alkadienyl, haloalkenyl, cycloalkenyl, alkynyl, haloalkynyl or cycloalkynyl, phenyl, naphthyl, or a five to ten-membered saturated, partially unsaturated or aromatic heterocyclus containing between one and four heteroatoms from the group containing O, N or S; R.sup.2 represents hydrogen or R.sup.1; R.sup.1 and R.sup.2 can form, together with the nitrogen atom to which they are bonded, a five or six-membered ring, which can be interrupted and/or substituted by an atom from the group O, N and S; whereby R.sup.1 and/or R.sup.2 can be substituted in accordance with the description. The invention also relates to methods and intermediate products for producing said compounds, to agents containing the latter and to the use of said compounds for combating harmful fungi. ##STR00001##