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Abstract

.alpha.-Amino acid amides of formula (I) wherein the substituents are defined as follows: n is the number zero or one; R.sub.1 to R.sub.7 are as herein defined; R.sub.8 is C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 alkenyl or C.sub.3 -C.sub.6 alkynyl; R.sub.9 is C.sub.3 -C.sub.8 cycloalkyl; a C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 alkenyl or C.sub.3 -C.sub.6 alkynyl group substituted by one or more halogen atoms; or a group (a) wherein p and q are identical or different and are each independently of the other the number zero or one; and R.sub.13, R.sub.14, R.sub.15 and R.sub.16 are identical or different and are each independently of the others hydrogen or C.sub.1 -C.sub.4 alkyl; and X is hydrogen, in which case p and q must have the value zero; phenyl unsubstituted or mono- or poly-substituted by halogen, nitro, cyano, carboxy, C.sub.2 -C.sub.6 alkenyl, C.sub.2 -C.sub.6 alkynyl, C.sub.1 -C.sub.6 haloalkyl, C.sub.3 -C.sub.6 alkenyloxy, C.sub.3 -C.sub.6 alkynyloxy, C.sub.3 -C.sub.7 cycloalkyl, C.sub.1 -C.sub.6 haloalcoxy, C.sub.1 -C.sub.6 alkylthio, C.sub.1 -C.sub.6 alcoxycarbonyl, C.sub.3 -C.sub.6 alkenyloxycarbonyl, C.sub.3 -C.sub.6 alkynyloxycarbonyl, C.sub.1 -C.sub.6 alkyl or by C.sub.1 -C.sub.6 alkoxy; cyano; --COOR.sub.17 ; --COR.sub.18 or a group (b) wherein R.sub.17 and R.sub.21 are each independently of the other hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 alkenyl or C.sub.3 -C.sub.6 alkynyl, and R.sub.18 is hydrogen; C.sub.1 -C.sub.6 alkyl, C.sub.2 -C.sub.6 alkenyl, C.sub.2 -C.sub.6 alkynyl or phenyl, unsubstituted or substituted by halogen, nitro, cyano, C.sub.1 -C.sub.4 alkyl or by C.sub.1 -C.sub.4 alkoxy, and R.sub.19 and R.sub.20 are identical or different and are each independently of the other hydrogen or C.sub.1 -C.sub.4 alkyl, are valuable microbicides. They can be used in plant protection in the form of suitable compositions, for example in the control of fungal diseases. ##STR1##

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