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研究了陕西渭北旱塬地区小麦黄矮病发生突变的规律；建立了定量的尖角突变模型；确定了突变区域。根据病害落入的不同区域分析，采取相应防治策略。若病害落入潜在危害区的上限附近，必须采取防治措施，否则将造成不可逆的产量损失，这是由突变模型的性质与黄矮病特性共同决定的。潜在危害区的上限可作为黄矮病的动态防治指标。小麦黄矮病大发生有１１～１２年的周期，而此周期由２个叠加的周期（５～６年）组成。大发生的周期与太阳黑子活动周期相吻合。
The law of the mutation of wheat yellow dwarf virus in the Weibei dry-land of Shaanxi Province was studied. A quantitative model of sharp-angle mutation was established and the mutation region was identified. According to the analysis of the different regions into which the disease has fallen, take appropriate control strategies. If the disease falls into the vicinity of the upper limit of the potentially hazardous area, prevention and control measures must be taken or it will cause irreversible loss of production, which is determined by the nature of the mutation model and the characteristics of the yellow dwarf virus. The upper limit of the potentially hazardous area can serve as a dynamic control indicator of yellow dwarf disease. Wheat dwarf disease occurs 11 to 12 years, and this cycle consists of two superimposed cycles (5-6 years). The period of occurrence coincides with the period of sunspot activity.