The invention relates to triazolopyrimidines of formula (I), in which the substituents are defined as follows: L1 represents cyano, S(═O)nA1 or C(═O)A2, wherein A1 stands for hydrogen, hydroxy, alkyl, alkylamino or dialkylamino; A2 stands for C1–C8 alkoxy, C1–C6 haloalkoxy or one of the groups named in A1; and n stands for 0, 1 or 2; L2, L3 represent hydrogen or halogen; L4, L5 represent hydrogen, halogen or alkyl; X represents halogen, cyano, alkyl, haloalkyl, alkoxy or haloalkoxy; R1 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; R2 represents hydrogen or R1; R1 and R2 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 R1 and/or R2 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.