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Abstract

Novel benzo-1,2,3-thiadiazole derivatives of the formula ##STR1## in which; A is --OR.sub.4, --SR.sub.4, --N(R.sub.5)R.sub.6, --N(R.sub.7)--N(R.sub.5)R.sub.6, --O--N.dbd.C(R.sub.8)R.sub.9, --N(R.sub.7)--OR.sub.10, or ##STR2## R.sub.4 is C.sub.1 -C.sub.18 alkyl, C.sub.3 -C.sub.35 alkyl which is interrupted by an oxygen or sulfur atom, C.sub.1 -C.sub.8 alkyl which is substituted by halogen or --COOR.sub.7, C.sub.3 -C.sub.6 alkenyl which is unsubstituted or substituted by halogen, C.sub.3 -C.sub.6 alkinyl which is unsubstituted or substituted by halogen, C.sub.4 -C.sub.7 cycloalkyl which is unsubstituted or substituted by halogen or methyl, an aryl or heterocyclic radical U having not more than 3 heteroatoms O, N and/or S, or a radical U which is linked via an alkylene bridge containing not more than 6 carbon atoms and up to 2 oxygen atoms. The novel active substances have plant protection properties and are particularly suitable for preventive protection of plants against attack by phytopathogenic microorganisms such as fungi, bacteria and viruses.

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