The present invention relates to 4-substituted amidine derivatives of the general formula (I), wherein A1-A4, D, L, Q, R7, R7′ and integer's v and w 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 amidine derivatives, all according to the invention. This invention further relates to a method for controlling undesired phytopathogenic microorganisms by application of said 4-substituted amidine derivatives of general formula (I) to such undesired microorganisms and/or to their habitat, according to the invention.