This invention relates to 4-substituted phenylamine derivatives of the general formula (I), wherein R1 to R9 and A have the meanings as defined in description. The invention further relates to methods for their preparation and use of said compounds to fight undesired phytopathogenic microorganisms, and agents for said purpose, comprising said phenylamine derivatives, all according to the invention. This invention further relates to a method for fighting undesired phytopathogenic microorganisms by application of said 4-substituted phenylamine derivatives of general formula (I) to such undesired microorganisms and/or to their habitat, according to the invention.