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玉米霜霉病(丛顶病)是由指梗疫霉(Sclerophthora macrospora(Sacc.)Thirum.Shwa Naras.)引起的。一般发生在温带地区,已报导分布在美国、加拿大、欧州、非洲和亚洲等地,我国江苏、四川等省曾零星发生。1977年8月,在我区肥城县城关公社大王大队玉米制种田内首次发现,近些年来发生面积和严重程度逐渐扩大和加重。由于这种病害系统性侵染,感病植株颗粒不收,对产量影响较大。
Corn downy mildew (pestle disease) is caused by Sclerophthora macrospora (Sacc.) Thirum. Shwa Naras. Generally occurs in temperate regions. It has been reported in the United States, Canada, Europe, Africa and Asia. China’s Jiangsu and Sichuan provinces have been sporadic. In August 1977, for the first time in Maize Plantation of the Wang Brigade of Chengguan Commune in Feicheng County in our district, it was first discovered that the area and severity of the occurrence in recent years have gradually expanded and intensified. Due to the systemic infection of this disease, the infected plants do not accept the grain and have a great impact on the yield.