The invention relates to 6-(2,3,6-trifluorophenyl)-triazolopyrimidines of formula (I), in which the substituents are defined as follows: R1 represents alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkenyl, haloalkenyl, cycloalkenyl, halocycloalkenyl, alkynyl, haloalkynyl or phenyl, naphthyl, or a five- or six-membered saturated, partially unsaturated or aromatic heterocycle, containing one to four heteroatoms from the group O, N or S; R2 represents hydrogen or one of the groups cited for R1; R1 and R2, together with the nitrogen atom, to which they are bonded, can also form a five- or six-membered heterocyclyl or heteroaryl, which is bonded via N and can contain one to three additional heteroatoms from the groups O, N and S as a ring member; R1 and/or R2 can be substituted in accordance with the description; X represents cyano, alkyl, alkoxy, alkenyloxy, haloalkoxy or haloalkenyloxy. The invention also relates to methods for producing said compounds, to agents containing the latter and to their use for combating plant-pathogenic fungi.