杉木球果麦蛾Ｄｉｃｈｏｍｅｒｉｓｓｐ．是杉木的重要种实害虫，可造成杉木种子产量的严重下降。据４年调查结果，杉木球果麦蛾幼虫种群数量变动比较稳定，每样枝平均虫口密度０．２５－２．５头，无大起大落变化。由于幼虫在球果内危害，受气候、天敌等影响小，故存活率较高，平均存活率８５．８％。可以此作为参数，预报来年的种群消长趋势，为该虫的综合治理提供科学依据 Cunninghamia lanceolata Dichomerissp. Is an important species of Chinese fir pests, can cause a serious decline in Chinese fir seed yield. According to the results of four years of investigation, the population dynamics of A. caterpillar moth larvae was relatively stable. The average population density of each clump of branches was 0.25-2.5, with no significant fluctuations. As the larvae endanger the cones, affected by climate, natural enemies and other small, so a higher survival rate, the average survival rate of 85.8%. This can be used as a parameter to forecast the population growth and decline in the coming year and provide a scientific basis for the comprehensive management of the pest