Oxydiazine derivatives

Compounds of the formula <IMAGE> in which A represents an aromatic or non-aromatic, monocyclic or bicyclic, heterocyclic radical which is unsubstituted or mono- to tetrasubstituted, it being possible for one to two of the substituents of A to be selected from the group comprising halo-C1-C3-alkyl, cyclopropyl, halocyclopropyl, C2-C3-alkenyl, C2-C3-alkynyl, halo-C2-C3-alkenyl, halo-C2-C3-alkynyl, halo-C1-C3-alkoxy, C1-C3-alkylthio, halo-C1-C3-alkylthio, allyloxy, propargyloxy, allylthio, propargylthio, haloallyloxy, haloallylthio, cyano and nitro and one to four of the substituents of A to be selected from the group comprising C1-C3-alkyl, C1-C3-alkoxy and halogen; R represents hydrogen, C1-C6-alkyl, phenyl-C1-C4-alkyl, C3-C6-cycloalkyl, C2-C6-alkenyl or C2-C6-alkynyl; and X represents 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 substances and can be prepared in a manner known per se.