Further provided herein is the production of a spray mixture, including the contacting of a pesticide, the water-soluble copolymer (P), and water; and also a method for controlling phytopathogenic fungi, unwanted plant growth, unwanted insect infestation or mite infestation, and/or for regulating plant growth. The agrochemical composition acts on a pest, its environment, a crop plant to be protected from the pest, on the soil, the unwanted plant, the crop plant, and/or its environment.