method for controlling harmful organisms. The present invention relates to a method which exerts excellent control effects on harmful organisms in a soybean, corn or cotton field. a method for controlling noxious organisms in a soybean, corn or cotton field, wherein at least one ppo inhibitor compound selected from the group consisting of flumioxazine, sulfentrazone, saflufenacil, oxyfluorfen, fomesafene sodium and a compound represented by formula (i) 1,5-dimethyl-6-thioxo-3- (7-fluoro-3,4-dihydro-3-oxo-4-prop-2-ynyl-2h-1,4-benzoxazine-6-yl) -1 3,5-triazinan-2,4-dione are applied to the field before, during or after planting a fludioxonil-treated soybean, corn or cottonseed.
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