The present inventon provides a method for controlling weeds comprising a step of 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-tetrahydropyrimidine-3-yl)phenoxy]-2-pyridyloxy]acetate or flumioxazin before, simultaneously with, and/or after sowing crop seeds, which has an excellent efficacy for controlling weeds in a cultivation area of crops. The present invention also provides the above-mentioned method wherein the crops are the transgenic plant body or seeds that are tolerant to the protoporphyrinogen oxidase (PPO) inhibitors； and further provides the above-mentioned method wherein the crops are the transgenic plant body or seeds having any one of a polypeptide sequence selected from the group consisting of SEQ ID Nos. 1-32 described in the Description or a polypeptide sequence having at least 85% sequence identity to any one of SEQ ID Nos. 1-32.
