The general formula (I) {Wherein, Y is each independently a halogen atom, R 4 and R 3 is a hydrogen atom or the like independently, a hydrogen atom or the like independently R 1 and R 2 optionally substituted by halogen atom Good ( A is E is C-H and substituted cyclic groups specified, n is an integer of 1 to 5, a C 1 -C 6) alkyl group C-Y are as defined above (Y). or I represents a nitrogen atom. N-2- represented by} has a superior performance as compared to the prior art, a pesticide containing the same as an active ingredient, as well as salts thereof, or (hetero) aryl ethylcarboxamide derivatives, Teikusuri amount especially at it is useful as a nematicide or plant disease control agent was excellent with a wide spectrum control.一般式(I){式中、R1及びR2はそれぞれ独立に水素原子等を、R3及びR4はそれぞれ独立に水素原子等を、Yはそれぞれ独立にハロゲン原子;ハロゲン原子により置換されていても良い(C1-C6)アルキル基等を、nは1~5の整数を、Aは特定の置換環式基をEはC-H;C-Y(Yは上記に定義するとおりである。)又は窒素原子を表す。}で表されるN-2-(ヘテロ)アリールエチルカルボキサミド誘導体又はその塩類、ならびにこれを有効成分として含有する有害生物防除剤は、従来技術に比べて優れた性能を有し、特に低薬量で広い防除スペクトラムを有する優れた植物病害防除剤又は殺線虫剤として有用である。
