Hetarylalkenes, their preparation and intermediates for their preparation and their use

A method for controlling harmful fungi, wherein the fungi or the plants, seeds, materials, or areas threatened by fungal attack are treated with a fungicidally effective amount of a hetarylalkene of the formula I' ##STR15## where Ar is 3-pyridyl;

• A is C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.3 -C.sub.8 -cycloalkyl, C.sub.3 -C.sub.8 -cycloalkyl-C.sub.1 -C.sub.3 -alkyl or phenyl or phenylalkyl, where phenyl in each case may be mono-substituted, disubstituted, or trisubstituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -mono-, di- or trihaloalkyl, C.sub.1 -C.sub.4 -haloalkoxy, phenyl or halogen:
• Z is ##STR16## where R is hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.2 -C.sub.4 -acyl, phenyl, benzyl or benzoyl, in which each of the phenyl rings may be monosubstituted, disubstituted or trisubstituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -haloalkoxy, halogen, cyano or nitro, or R is C.sub.1 -C.sub.4 -alkylsulfonyl or unsubstituted or C.sub.1 -C.sub.4 -alkyl-substituted phenylsulfonyl,
• R.sup.1 is C.sub.1 -C.sub.4 -alkyl, phenyl or benzyl, where each of the phenyl rings may be mono-substituted, disubstituted or trisubstituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -haloalkoxy, halogen, cyano or nitro, and Hal is fluorine, chlorine, bromine or iodine;
• and
• B.sub.1 is aryl, or aralkyl wherein aryl in each case may be phenyl or naphthyl and in which each of the aromatic rings may be mono-substituted, disubstituted or trisubstituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -haloalkoxy, phenyl, halophenyl or halogen, and its N-oxides and addition salts with inorganic mineral acids, carboxylic acids or mononuclear aryl-sulfonic acids;
• or with a fungicide containing a hetarylalkene of formula I' as defined above, an N-oxide or an acid addition salt and conventional additives.