Provided is a method for controlling harmful organisms in a cultivation area of crops, including the steps of: (1) treating crop seeds with one or more fungicidal and/or plant growth regulator compounds； (2) treating a cultivation area of crops with ethyl [3-[2-chloro-4-fluoro-5-(1-methyl-6-trifluoromethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-3-yl)phenoxy]-2-pyridyloxy]acetate before, simultaneously with, and/or after sowing the crop seeds； and (3) performing a foliage treatment on crops with one or more compounds, which may include fungicidal and/or insecticidal compound(s), during a growing period of the crops, which has an excellent efficacy for controlling harmful organisms in a cultivation area of crops.
