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小麦黄矮病系麦蚜传播的病毒病害。研究其空间分布,不仅有助于确定或改进精确而有效的抽样设计方案,而且对深入了解病害的发生蔓延,以致流行的动态过程具有重要意义。我们于小麦灌浆期在陕西省渭北旱小麦黄矮病常发区域调查了5块病田。调查的发病数据,分别按病株、病级的实际发生频次加以整理,然后分别按分布型指数法中的平均拥挤度M°与平均数Mx的回归关系
Virus disease of wheat yellow dwarf virus transmitted by wheat aphid. Studying its spatial distribution not only helps to determine or improve the accurate and effective sampling design scheme, but also has important significance for understanding the spread of diseases and making epidemic dynamic process. We investigated five fields during the wheat filling stage in the area of yellow dwarf virus common in dry wheat in Weibei, Shaanxi Province. The incidence data of the survey were sorted according to the actual occurrence frequency of diseased plants and disease grades, and then the regression relationship between the average crowding degree M ° and the average number Mx respectively according to the distributed index method