The invention discloses condensed heterocyclic compouds [the wherein R indicated by formula (I)1Indicate hydrogen atom, halogen atom, C1 C3 alkyl, C1 C3 alkoxies, C2 C4 alkoxy carbonyls, the S (O) can optionally with one or more halogen atomsmR2、NR3R4, nitro or cyano;R2Indicate C1 C3 alkyl;R3And R4Independently indicate hydrogen atom or C1 C3 alkyl;And m and n independently indicate 0,1 or 2] or its N oxide, with outstanding harmful organisms control effect.