Arylamine derivatives and use thereof as microbicides

A compound of the formula ##STR21## wherein R is hydrogen or methyl,

• Ar is one of the aromatic groups ##STR22## wherein R.sub.1 is C.sub.1 -C.sub.3 alkyl, C.sub.1 C.sub.3 alkoxy or halogen,
• R.sub.2 is NO.sub.2 or NH.sub.2,
• R.sub.3 is hydrogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy or halogen,
• R.sub.4 is hydrogen or C.sub.1 -C.sub.3 alkyl,
• R.sub.5 is hydrogen or C.sub.1 -C.sub.3 alkyl, and
• R.sub.6 is hydrogen, C.sub.1 -C.sub.3 alkyl or halogen;
• R.sub.8 is C.sub.1 -C.sub.3 alkyl,
• B is C.sub.3 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl, cyclopropyl, 2-furyl, 2-tetrahydrofuryl, .beta.-(C.sub.1 -C.sub.2 alkoxy)ethyl or the group CH.sub.2 Z, in which
• Z is 1H-1,2,4-triazolyl, methylsulfonyl, X-R.sub.13, OSO.sub.2 -R.sub.14 or -N(.sub.15)(R.sub.16), in which
• X is oxygen or sulfur,
• R.sub.13 is an alkyl, alkenyl or alkynyl group, each containing at most 4 carbon atoms.
• R.sub.14 is C.sub.1 -C.sub.3 alkyl or NH(C.sub.1 -C.sub.3 alkyl), and
• R.sub.15 and R.sub.16, each independently of the other, are C.sub.1 -C.sub.3 alkyl.