Pyridyl-1,2,4-thiadiazoles as pest-control agents

A method of combating fungi which comprises applying to such fungi or to a locus from which it is desired to exclude such fungi a fungicidally effective amount of a compound or salt of a pyridyl-1,2,4-thiadiazole of the formula ##STR279## in which R.sup.1 represents 2-pyridyl, 3-pyridyl or 4-pyridyl, it being possible for each of these radicals to be monosubstituted to tetrasubstituted by identical or different substituents consisting of halogen, cyano, nitro, in each case straight-chain or branched alkyl, alkoxy or alkylsulphonyl having in each case 1 to 6 carbon atoms, in each case straight-chain or branched halogenoalkyl, halogenoalkoxy or halogenoalkylsulphonyl having in each case 1 to 6 carbon atoms and 1 to 13 identical or different halogen atoms, straight-chain or branched alkoxycarbonyl having 1 to 6 carbon atoms in the alkoxy group, straight-chain or branched alkoximinoalkyl having 1 to 6 carbon atoms in the alkoxy moiety and 1 to 6 carbon atoms in the alkyl moiety, and of phenyl which in turn may be monosubstituted to tetrasubstituted by identical or different substituents consisting of halogen and/or straight-chain or branched alkyl or alkoxy having in each case 1 to 6 carbon atoms and/or straight-chain or branched halogenoalkyl or halogenoalkoxy having in each case 1 to 6 carbon atoms and 1 to 13 identical or different halogen atoms, and

• R.sup.2 represents aryl having 6 to 10 carbon atoms, it being possible for each of these radicals to be monosubstituted to pentasubstituted by identical or different substituents consisting of halogen, cyano, nitro, in each case straight-chain or branched alkyl, alkoxy or alkylsulphonyl having in each case 1 to 6 carbon atoms, in each case straight-chain or branched halogenoalkyl, halogenoalkoxy or halogenoalkylsulphonyl having in each case 1 to 6 carbon atoms and 1 to 13 identical or different halogen atoms, straight-chain or branched alkoxycarbonyl having 1 to 6 carbon atoms in the alkoxy group, straight-chain or branched alkoximinoalkyl having 1 to 6 carbon atoms in the alkoxy moiety and 1 to 6 carbon atoms in the alkyl moiety, and of phenyl which in turn may be monosubstituted to pentasubstituted by identical or different substituents consisting of halogen and/or straight-chain or branched alkyl or alkoxy having in each case 1 to 6 carbon atoms and/or straight-chain or branched halogenoalkyl or halogenoalkoxy having in each case 1 to 6 carbon atoms and 1 to 13 identical or different halogen atoms.