The present invention relates to a method for applying an aqueous, pesticide-containing dispersion of a polyurethane which is a reaction product of at least one polyol (A) and at least one polyisocyanate (B) onto plants or plant parts. The invention also relates to an aqueous, pesticide-containing dispersion of a polyurethane which is a reaction product of at least one polyol (A) and at least one polyisocyanate (B). The invention further relates to the use of the dispersion for controlling phytopathogenic fungi and/or undesired plant growth and/or undesired insect or mite infestation and/or for regulating the growth of plants by letting the dispersion act on the respective pests, their biotope and/or the plants and plant parts to be protected from the respective pests, the soil and/or on undesired plants and/or useful plants and/or their biotope.
