The invention relates to disinfecting agents for combating and inactivating phytopathogenic organisms for use on plants and in their environment. The agents are based on a mixture of anionic, active surfactants, aliphatic and aromatic carboxylic acids, glycols, hydrotropic agents and aliphatic, monovalent alcohol, and are characterized in that they contain, together with hydrotropic agents and monovalent alcohols, a combination of aliphatic and aromatic carboxylic acids determined from alkyl- and/or alkylarylsulfonates as well as contain glycols determined individually or in a mixture as solvent.