The present invention provides a composition comprising a pesticide and a copolymer, which contains in polymerized form a N-vinyllactam (monomer A) an acrylamide (monomer B) selected from N&mdashC1-C6-alkyl acrylamide and N,N-di-C1-C6-alkyl acrylamide and a C1-C4-alkyl (meth)acrylate (monomer C). Further on, it provides a process for preparing said composition by contacting the pesticide and the copolymer a method for controlling phytopathogenic fungi and/or unwanted plant growth and/or unwanted insect or mite infestation and/or for regulating the growth of plants, wherein said composition is caused to act on the respective pests, their habitat or the plants to be protected from the respective pest, to the soil and/or to unwanted plants and/or the crop plants and/or their habitat and a plant propagation material comprising said composition.
