鞭角华扁叶蜂Chinolydaflagellicornis（F．Smith）是危害柏木的主要害虫，近年来在长江沿岸柏木防护林区发生严重，造成灾害。为了解该虫的种群动态规律及影响虫口数量变动的致死原因，并为该虫的预测预报提供资料，笔者于1995～1996年在忠县、云阳两县对鞭角华扁叶蜂自然种群 Chinolydaflagellicornis (F. Smith), a major pest of cedar harms, has suffered serious disasters in recent years in the cypress shelterbelt along the Yangtze River. In order to understand the population dynamics of the pest and the cause of the death that affected the change of the number of pests, and to provide information for the prediction of the pest, the author studied the natural populations of the Bipolaris spp. From 1995 to 1996 in two counties of Zhongxian and Yunyang,