Compounds of the formulain whichA is an unsubstituted or mono- to tetrasubstituted, aromatic or non-aromatic, monocyclic or bicyclic heterocyclic radical, where one to two of the substituents of A can be selected from the group consisting of halo-C1-C3alkyl, cyclopropyl, halocyclopropyl, C2-C3alkenyl, C2-C3alkynyl, halo-C2-C3alkenyl, halo-C2-C3alkynyl, halo-C1-C3alkoxy, C1-C3alkylthio, halo-C1-C3alkylthio, allyloxy, propargyloxy, allylthio, propargylthio, haloallyloxy, haloallylthio, cyano and nitro, and one to four of the substituents of A can be selected from the group consisting of C1-C3alkyl, C1-C3alkoxy and halogenR is hydrogen, C1-C6alkyl, phenyl-C1-C4alkyl, C3-C6cycloalkyl, C2-C6alkenyl or C2-C6alkynyl andX is N—NO2 or N—CN, and,if appropriate, tautomers thereof, in each case in free form or in salt form, can be used as agrochemical active ingredients and can be prepared in a manner known per se.
