5-Alkylamino-6-phenyl-7-halo-triazolopyrimidines of formula I
in which

R 1 and R 2 independently denote hydrogen or alkyl, alkenyl, alkynyl, alkadienyl, or haloalkyl, cycloalkyl, bicycloalkyl, phenyl, naphthyl, or
5- or 6-membered heterocyclyl, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, or
5- or 6-membered heteroaryl, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, or
where R 1 and R 2 radicals may be unsubstituted or substituted as defined in the description,
R 1 and R 2 together with the interjacent nitrogen atom represent a 5- or 6-membered heterocyclic ring, containing one to four nitrogen atoms or one to three nitrogen atoms and one sulfur or oxygen atom, which may be substituted;
L is hydrogen, halogen, alkyl, alkoxy and haloalkyl;
n is an integer from 1 to 5; and
x is halogen;
processes for their preparation, compositions containing them and to their use for combating phytopathogenic fungi.