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.本發明係關於通式(I)的4-經取代之苯基胺衍生物,其中R1至R9和A具有如說明中所定義的意義。本發明進一步關於彼等的製備方法和該等化合物對抗不要的植物病原性微生物之用途,及用於該等目的之包含該等苯基胺衍生物的藥劑。本發明進一步關於一種藉由將該等通式(I)的4-經取代之苯基胺衍生物施用於該等不要的微生物及/或其棲息地來對抗不要的植物病原性微生物之方法。