小麦黄矮病是由麦蚜传毒引起的病毒性病害。我区从1970年黄矮病严重流行导致小麦大减产以来,该病历年发生,只是发生程度不同。其流行程度,根据全国七个代表性的省区1977年12月23日于山西临汾共同商定的分级标准是:小麦抽穗至乳熟期平均植株 Wheat yellow dwarf virus is a viral disease caused by wheat aphid. My area from 1970 due to the serious epidemic of yellow dwarf led to a major reduction in wheat, the disease occurs over the years, but the degree of occurrence is different. Its prevalence, according to the country’s seven representative provinces and autonomous regions on December 23, 1977 in Shanxi Linfen jointly agreed grading standards are: wheat heading average to milky millet