玉米丝黑穗病在庆阳地区发生普遍,为害严重,发病株率一般为5—35%,严重者达50%以上,受害田块占玉米面积的92%。1980年和1981年对其危害进行了调查,并对本所玉米组提供的10个自交系,推广及组配的20个杂交种进行了接种抗病鉴定。今将调查和鉴定结果分述如下,并提出相应的防治措施。 Maize head smut is common in Qingyang area, causing serious damage. The incidence of the disease is generally 5-35% and severe cases is more than 50%. The affected fields occupy 92% of the area of ​​corn. In 1980 and 1981, the investigation of the damage was carried out. Inoculation resistance test was carried out on 10 inbred lines provided by our corn group, and 20 hybrids promoted and assembled. The results of this investigation and appraisal will be as follows, and put forward corresponding prevention and control measures.