根据几年来的研究结果证明,在延边地区柞蚕软化病中,由链球菌属(Sterptococcus Rosenbacn)细菌感染而引起的对蚕茧生产危害很大。调查表明,软化病严重地区,其发病率可达40—60％。发病重的蚕儿当代就死亡,发病轻的蚕儿即使能做茧化蛹,但下一代还能继续传染。本文将报告链球菌株的分离、致病性及其鉴定结果。 According to the results of several years of research, it is proved that the production of silkworm cocoon caused by bacterial infection of Sterptococcus Rosenbacn is very harmful in Tussilago farfara in Yanbian area. Survey shows that severe areas of softening disease, the incidence of up to 40-60%. Severe cases of cocoon death in the contemporary, the incidence of light cocoon even cocoon pupation, but the next generation can continue to be infected. This article reports the isolation, pathogenicity and identification of streptococcal strains.