黑麦秆黑粉病在国内未见过报道。一九六三年,我们在武都县东江公社的高山地区首次发现,一九六六年,在岷县麻子川公社再次发现,发病率一般田块0.1—0.3％,最高达1％。据访问,现在六、七十岁的老农幼小时曾见过此病,说明黑麦秆黑粉病在武都地区发生很早。为了弄清这种病害的基本情况,我们于一九六三年以来,断断续续作了一些观察,结果如下:一、症状:黑麦拔节以后(三、四月)开始发病,先在叶片上出现与叶脉平行的铅灰色条纹,微微突起,破裂后散出黑粉,病重者茎叶扭曲,生长停滞,不能抽穗;轻者虽能抽 Rye powdery mildew has not been reported in China. In 1963, we found for the first time in the alpine region of the Dongjiang commune in Wudu County that in 1966, once again discovered in the Minzong Mazichuan Commune in Minxian County, the incidence rate is generally 0.1-0.3% and up to 1%. According to the interview, the six or seventy-year-old peasants have seen this disease when young, indicating that rye stalk powdery mildew occurs very early in the Wudu area. In order to understand the basic situation of this disease, we made some observations intermittently since 1963. The results are as follows: 1. Symptoms: The onset of disease begins after the rye has been cut off (in March and April), and leaves appear on the leaves Lead gray stripes parallel to the veins, slightly protruding, rupture of the black powder, severe cases of stems and leaves distorted, stagnant growth, can not be heading; Although the light pumping