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按霜霉病的命名去记述小麦霜霉病是困难的,因为它既无明显的霉层,又无可见的绒毛状物,可是这种病原菌在其它寄主上确实产生霜霉。本病对植株有破坏性,但感染率一般不高,除亚洲的热带地方或潮湿地区外,在经济上没有太大重要性。本病还为害大麦、水稻、玉米、燕麦、高粱和几种多年生与一年生杂草。在禾本科杂草中,冰草属(Agropyron)、早熟禾属(Poa)、雀麦属(Bromus)和虉草属(Phalaris)的一些种最易感病。意大利于1900年首次报道了小麦霜霉病。
It is difficult to describe wheat downy mildew by the name of downy mildew because it has neither apparent moldy nor visible villi but this pathogen actually produces downy mildew on other hosts. The disease is damaging to plants, but the infection rates are generally not high, economically insignificant except in tropical or wet areas of Asia. The disease is also harmful to barley, rice, corn, oats, sorghum and several perennials and annual weeds. Among grass weeds, some species of Agropyron, Poa, Bromus and Phalaris are the most susceptible. Italy first reported wheat downy mildew in 1900.