A condensed heterocyclic compound represented by formula (I) [wherein R 1 represents a hydrogen atom, a halogen atom, a C1-C3 alkyl group which may have optionally one or more halogen atoms, a C1-C3 alkoxy group, a C2-C4 alkoxycarbonyl group, S(O) m R 2 , NR 3 R 4 , a nitro group or a cyano group R 2 represents a C1-C3 alkyl group R 3 and R 4 independently represent a hydrogen atom or a C1-C3 alkyl group and m and n independently represent 0, 1 or 2] or an N oxide thereof has an excellent noxious organism control effect.
