An N-2-(hetero)arylethylcarboxamide derivative represented by the formula (I)wherein R1and R2are each independently a hydrogen atom etc., R3and R4are each independently a hydrogen atom etc., each Y is independently a halogen atom a (C1-C6)alkyl group optionally substituted by halogen atom(s) etc., n is an integer of 1 to 5, A is a specific substituted cyclic group, E is C-H C-Y (Y is as defined above) or a nitrogen atom, a salt thereof, and a pest controlling agent containing the derivative or salt as an active ingredient show superior performance as compared to the prior art technique, and are useful particularly as plant disease controlling agents or nematocides having a broad control spectrum at a low dose.一種式(I)所示之N-2-(雜)芳基乙基甲醯胺衍生物及其鹽類:其中,R1和R2各自獨立為氫原子等;R3和R4各自獨立為氫原子等;每個Y各自獨立為鹵原子、視需要經鹵原子取代之(C1-C6)烷基等;n為1至5的整數;A為特定經取代之環狀基;E為C-H、C-Y(Y為上述定義者)或氮原子,且含該衍生物或其鹽類作為活性成分之蟲害防治劑顯示出比起先前技術更優異之性能,而且該蟲害防治劑特別適用作於低劑量下具寬廣防治範圍之植物疾病防治劑或殺線蟲劑。
