The resent invention relates to an agrochemical formulation comprising a pesticide, an organic UV photoprotective filter and coated metal oxide nanoparticles. It also relates to a method for preparing said formulation. Further on, it also relates to the use of a mixture of an organic UV photoprotective filter and coated metal oxide nanoparticles in agrochemical formulations and the use of a agrochemical formulation according to the invention for stabilizing a pesticide against UV irradiation. Further on, it relates to a method of combating harmful insects and/or phytopathogenic fungi, which comprises contacting plants, soil or habitat of plants in or on which the harmful insects and/or phytopathogenic fungi are growing or may grow, plants or soil to be protected from attack or infestation by said harmful insects and/or phytopathogenic fungi with an effective amount of the formulation according to the invention, to a method of controlling undesired vegetation, which comprises allowing a herbicidal effective amount of said formulation to act on plants, their habitat.