Provided is a method for reducing damage by harmful organisms in corn cultivation. Damage by harmful organisms in corn cultivation can be reduced by carrying out the steps of: A) making a furrow in a cultivated land B) seeding corn into the furrow formed in the foregoing step C) applying to the furrow one or more selected from the below-mentioned compound group (I) and chlorpyrifos and D) closing the furrow. compound group (I): group consisting of clothianidin, thiamethoxam, imidacloprid and thiacloprid.
