The invention relates to a method of preparing an agrochemical composition comprising the steps of preparing a premix by contacting a solid water-insoluble pesticide and a hydrophobin and preparing a raw suspension by milling the premix； an agrochemical composition which is obtainable by said method； a use and method of application of hydrophobin for reducing the toxicity of a solid water-insoluble pesticide； a method of controlling phytopathogenic fungi and/or undesired plant growth and/or undesired insect or mite attack and/or for regulating the growth of plants； and seed containing said suspension.
