1983年以来,宁夏引黄灌区小麦赤霉病的发病面积和严重程度不断增加,到1988年,灌区发生赤霉病的面积已占小麦面积的70～85％,平均病穗率为14.4％,最高达80％。为了探索赤霉病的发病因素,1986～1988年我们对宁夏引黄灌区小麦赤霉病的发生情况进行了较为系统的调查和试验。本文着重分析和讨论赤霉病的侵染源问题。 Since 1983, the area and severity of scab in the irrigation area of ​​Yellow River diversion in Ningxia have been increasing. By 1988, the area of ​​scab caused by irrigation took up 70-85% of the area of ​​wheat with an average rate of 14.4% Up to 80%. In order to explore the risk factors of scab, 1986 ~ 1988 we conducted a more systematic investigation and test of the occurrence of wheat scab in Ningxia Yellow River Irrigation Area. This article focuses on analyzing and discussing the source of Fusarium head blight.