The present invention relates to compounds of the formula (I), in particular to phenylamidines of the formula (I), to a process for their preparation, to the use of phenylamidines of the formula (I) according to the invention for controlling unwanted microorganisms, in particular phytopathogenic fungi and also to a composition for this purpose, comprising the phenylamidines of the formula (I) according to the invention. Furthermore, the invention relates to a method for controlling unwanted microorganisms, in particular phytopathogenic fungi, characterized in that the compounds of the formula (I) are applied to the microorganisms, in particular to the phytopathogenic fungi and/or in their habitat.本發明關於式(I)之化合物,特別是關於式(I)之苯脒,關於彼等之製備方法,關於根據本發明的式(I)之苯脒用於控制有害微生物(特別是植物病原性真菌)之用途,以及為此目的之組成物,其包含根據本發明的式(I)之苯脒。此外,本發明關於一種用於控制有害微生物(特別是植物病原性真菌)之方法,其特徵在於將式(I)之化合物施用於微生物(特別是植物病原性真菌)及/或其棲息地。