The present invention relates to a composition comprising pesticide and polyalkylene oxide. The invention furthermore relates to pyrrolidone alkylene oxides and the use thereof in agrochemical formulations. It furthermore relates to the use of the composition according to the invention for controlling phytopathogenic fungi and/or undesired vegetation and/or undesired attack by insects or mites and/or for regulating the growth of plants. Furthermore, it relates to the use of a composition according to the invention for controlling undesired attack by insects or mites on plants and/or for controlling phytopathogenic fungi and/or for controlling undesired vegetation, where seeds of useful plants are treated with the composition. Finally, the present invention also relates to seed treated with the composition according to the invention. The present invention comprises combinations of preferred features together with other preferred features.
