榆林地区冬小麦死亡发生普遍严重,损失巨大,这是当前小麦生产上存在的最突出、最迫切需要解决的问题。各地对冬小麦死亡原因看法尚有分歧,可归纳为三方面:(1)认为是不适宜的气候条件,如霜冻干旱引起的;(2)认为是根腐病;(3)认为是叶跳蝉传媒而引起的红矮病。为了澄清原因及探讨防治途径,我们从1958年开始进行较系统的调查研究,并做小型试验,现已获得初步结果,兹汇总结简 The death of winter wheat in Yulin area is widespread and the loss is huge. This is the most prominent and urgent problem to be solved in wheat production. There are still differences over the reasons for the death of winter wheat, which can be summarized into three aspects: (1) climatic conditions considered to be unfavorable, such as caused by frost and drought; (2) root rot; (3) Red dwarf caused by the media. In order to clarify the causes and to explore ways of prevention and treatment, we conducted a systematic investigation and study since 1958 and conducted small-scale experiments. Preliminary results have been obtained and conclu- sions are now available