Process and a composition for immunizing plants against diseases

Compounds of formula XI' ##STR113## in which:

• X' is hydrogen, halogen, methyl, methoxy or COOH;
• E.sup.b hydrogen, C.sub.1 -C.sub.16 alkyl, benzyl, acetyl, the sulfonic acid radical (--SO.sub.3 H--), cyano, or as part of a disulfide bridge, is a second radical ##STR114## in which:
• Z.sup.b is cyano or COA;
• A is UR, N(R.sub.1)R.sub.2 or U.sup.1 N(.dbd.C).sub.n (R.sub.3)R.sub.4 ;
• M is the molar equivalent of an alkali metal or alkaline earth metal ion that has been formed from a corresponding base or basic compound;
• U is oxygen or sulfur;
• U.sup.1 is oxygen or --N(R.sub.5)--;
• R is C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkyl that is substituted by halogen, cyano, hydroxy or by U--C.sub.1 -C.sub.3 alkyl, (T)--COOH or (T)--COOC.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.6 alkenyl, halo-substituted C.sub.3 -C.sub.6 alkenyl, C.sub.3 -C.sub.6 alkynyl, halo-substituted C.sub.3 -C.sub.6 -alkynyl, (T).sub.n --C.sub.3 -C.sub.8 cycloalkyl, or a group selected from the following:
• ##STR115## each of X.sup.a, X.sup.b and X.sup.c, independently of the others, is hydrogen, halogen, hydroxy, cyano, HOOC, MOOC, C.sub.1 -C.sub.3 alkyl-OOC, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.2 haloalkyl having up to 5 halogen atoms;
• or
• X.sup.a is C.sub.1 -C.sub.2 haloalkoxy having up to 5 halogen atoms, phenyl, phenoxy, benzyloxy or sulfamoyloxy and X.sup.b and X.sup.c are both hydrogen;
• or
• X.sup.a is phenyl, phenoxy or benzyloxy and X.sup.b is halogen or methyl and X.sup.c is hydrogen;
• or
• X.sup.a, X.sup.b and X.sup.c together are 4 or 5 fluorine atoms;
• naphth is a naphthyl radical that is unsubstituted or is substituted by halogen, methyl or by methoxy;
• W is a 5- to 7-membered saturated or unsaturated heterocycle having from 1 to 3 hetero atoms from the group O, N and S that is unsubstituted or is substituted by halogen, trifluoromethyl, cyano, C.sub.1 -C.sub.2 alkyl or by a C.sub.1 -C.sub.2 -alkoxycarbonyl-C.sub.2 -C.sub.4 alkyleneimino radical, or is a monosaccharide radical;
• T is a bridge member --CH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH(CH.sub.3)--, --CH.sub.2 CH.sub.2 CH.sub.2 -- or --CH.sub.2 CH.sub.2 O--;
• R.sub.1 is C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkyl interrupted by an oxygen or sulfur atom, C.sub.1 -C.sub.5 alkyl substituted by halogen, cyano, HOOC or by C.sub.1 -C.sub.2 alkyl-OOC, C.sub.1 -C.sub.5 alkyl interrupted by an oxygen or sulfur atom and substituted by halogen, cyano, HOOC or by C.sub.1 -C.sub.2 alkyl-OOC, C.sub.3 -C.sub.5 alkenyl, C.sub.3 -C.sub.5 -alkenyl substituted by C.sub.1 -C.sub.3 alkyl-OOC, C.sub.3 -C.sub.5 alkynyl, C.sub.3 -C.sub.5 -alkynyl substituted by C.sub.1 -C.sub.3 alkyl-OOC, (T).sub.n --C.sub.3 -C.sub.6 cycloalkyl, (T).sub.n --C.sub.3 -C.sub.6 cycloalkyl substituted by C.sub.1 -C.sub.3 alkyl-OOC, (T).sub.n -phenyl, or (T).sub.n -phenyl substituted in the phenyl moiety by halogen, hydroxy, methyl, CF.sub.3, cyano, methoxy, HOOC or by MOOC;
• R.sub.2 is hydroxy, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkyl substituted by cyano or by C.sub.1 -C.sub.3 -alkoxy, C.sub.1 -C.sub.4 alkoxy, or a 3- to 6-membered saturated or unsaturated heterocycle containing O, N or S as hetero atoms;
• R.sub.1 and R.sub.2 together are a heterocycle W;
• R.sub.3 is hydrogen, cyano, C.sub.1 -C.sub.6 alkyl, phenyl, phenyl substituted by halogen, hydroxy, methyl, methoxy, HOOC or by MOOC, or a heterocycle W;
• R.sub.4 is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkanoyl, C.sub.1 -C.sub.3 alkanoyl substituted by halogen or by C.sub.1 -C.sub.3 alkoxy, C.sub.3 -C.sub.5 alkenoyl, or C.sub.3 -C.sub.5 alkenoyl substituted by halogen or by C.sub.1 -C.sub.3 alkoxy;
• R.sub.3 and R.sub.4 together are a heterocycle W or a carbocyclic ring W';
• W' is a carbocyclic radical having from 3 to 7 ring carbon atoms;
• R.sub.5 is methyl;
• R.sub.6 is hydrogen or C.sub.1 -C.sub.4 alkyl;
• and
• n is 0 or 1.