曲牙锯天牛Dorysthens hydropicus Pascoe,是为害芦苇地下茎的主要害虫之一,但为害情况及生物学特征至今国内尚无报道。此虫一般发生在苇田沟边、路边等地势较高的地方,以幼虫为害芦苇地下茎,使受害部腐烂,有时将植株平地咬断,使苗枯而死亡,在我县一般被害株达20—40％,严重时达70％。主要寄主有荻Miscanthus saccharif lorus Benth,其次是芦Phragmites Dalytus hydropicus Pascoe is one of the major pests that damage the underground stems of reeds. However, no reports of damage and biological characteristics have been reported in China so far. The insects generally occur in the reed edge ditch, roadside and other high places, the larvae reed rhizome damage to the Ministry of decay, and sometimes the plant flat to snap, the seedlings dead and died in my county general victim of up to 20-40%, serious up to 70%. The main hosts are Digeminal Miscanthus saccharif lorus Benth, followed by Phragmites