A pest-control composition containing the following: a compound that can be represented by formula (1) or an N-oxide of such a compound； and 4-oxo-4-[(2-phenylethyl)amino]-butyric acid. A pest-control method that has a step in which an effective amount of the aforementioned pest-control composition is applied to plants, plant seeds, bulbs, or soil in which plants are cultivated. Said pest-control composition and pest-control method exhibit excellent pest-control efficacy.本發明係一種有害生物防除組成物，其係含有下述式(1)表示之化合物或其N-氧化物與4-側氧-4-[(2-苯基乙基)胺基]-丁酸。對於有害生物具有優異的防除效力。[式中，各符號表示記載於說明書中的定義]。
