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自东北三省、山东及北京中国科学院遗传所农场（培育黄淮海豆区大豆品种）采集ＳＭＶ毒株２３１个，用各地当前大豆主栽品种５６个测定毒株的毒力。结果将ＳＭＶ分为３个株系群，７个亚群，１３个株系，即Ｓ１，Ｓ２－１Ｍ，Ｓ２－１Ｎ，Ｓ２－２Ｍ，Ｓ２－２Ｎ，Ｓ２－３Ｍ，Ｓ２－３Ｎ，Ｓ３－１Ｍ，Ｓ３－１Ｎ，Ｓ３－２Ｍ，Ｓ３－２Ｎ，Ｓ３－３Ｍ，Ｓ３－３Ｎ。除Ｓ１外，各亚群包括引起系统花叶（Ｍ）及系统坏死（Ｎ）２类株系。大豆品种按抗性归成８类。病毒群体毒力自北向南逐渐增强，黑龙江省的毒株群体毒力最弱，北京的最强，品种抗性也自北向南逐渐增高，黑龙江省大多数为高感品种，吉林多为中感品种，辽宁为中抗品种，北京全属高抗品种，品种抗性水平与病毒群体毒力相互适应。
A total of 231 SMV strains were collected from three farms in Northeast China, Shandong Province and Beijing Institute of Genetics (Beijing-Huaihe area soybeans cultivated), and the virulence of the strains was tested with 56 current soybean varieties. Results The SMVs were divided into 3 groups, 7 subgroups and 13 strains, namely S1, S2-1M, S2-1N, S2-2M, S2-2N, S2-3M, S2-3N and S3- 1M, S3-1N, S3-2M, S3-2N, S3-3M, S3-3N. In addition to S1, each subgroup includes the type 2 strains that cause systemic mosaic (M) and systemic necrosis (N). Soybean varieties according to the resistance into 8 categories. The virulence of the virus population gradually increased from north to south, and the virulence of the virus strains in Heilongjiang Province was the weakest, the strongest in Beijing and the resistance of varieties gradually increased from north to south. Most of Heilongjiang Province were highly susceptible, while Jilin was mostly susceptible Varieties, Liaoning is a medium resistant variety, Beijing is a high resistant variety, variety resistance levels and virus group virulence to adapt to each other.