网室接种和田间调查测定SMV引致大豆的产量损失证明,SMV侵染大豆植株愈是在生育早期产量损失愈重。盛花期以后发病的植株产量损失显著减小,鼓粒初期的病株几乎无产量损失。SMV不同毒株引致的产量损失显著不同,强毒株的侵染,引致感病品种的产量损失平均超过弱毒株的40％。根据不同初侵染水平的30组SMV流行与产量损失数据,采用逐步回归分析,建立了准确度较高的产量损失预测多点模型和单点模型。根据损失测定,大豆盛花期的SMV病株率低于3％可控制SMV流行所造成的产量损失。 Mesh-inoculation and field surveys determined that the loss of yield of SMV-induced soybeans demonstrated that the more SMV-infested soybean plants were, the heavier the yield was lost in the early stages of reproductive development. The loss of plant yield after the flowering stage was significantly reduced, and there was almost no yield loss of the diseased plants at the initial stage of drumming. The yield loss caused by different strains of SMV was significantly different. The infection by virulent strains resulted in the yield loss of susceptible varieties on average more than 40% of the attenuated strains. According to the prevalence and yield loss data of 30 groups of SMVs with different initial infection levels, stepwise regression analysis was used to establish a multi-point model and a single-point model for predicting yield loss with high accuracy. Based on the loss determination, less than 3% of the SMV diseased soybean at flowering stage can control the yield loss caused by the prevalence of SMV.