Abstract: The eurytomid wasp,Aiolomorphous rhopaloldes and the torymid,Diomorus aiolomorphi,are two dominant species of chalcid-flies infesting bamboo. Adults of A.rhopaloides emerge from mid February to mid April, but stay in the gall until late March.They lay eggs in newly-sprouted buds and a gall develops at the site of egg-layiiig as the bud develops into a new branchlet.1～3 eggs can be laid in each hud but only one larva survives.The larvae feed on internal tissue of the gall and pupate in mid September. Winter is passed as pupae in the gall and there is one generation a year. D.aiolomorphi pupate from early January to mid March.Adults emerge in late April and lay eggs in young galls developed by A.rhopaloides.Larvae of D.aiolomorphi,after hatching,kill the larvae of A.rhopaloides,occupy the gall,feed on the internal tissue and develop into maturity after November. The torymid overwinters as mature larvae in the gall.There is one generation a year.