The present invention concerns an agrochemical composition comprising: —particles of at least one silicate; —one or more fungicide(s) selected from the group consisting of strobilurin fungicides, triazole fungicides, dithio-carbamate fungicides, succinate dehydrogenase inhibitors and biofungicides. The invention also concerns a method for treating a plant wherein a composition as described above is applied onto or next to at least one part of said plant.