啤酒花霜霉病属于流行性病害。病菌寄生于啤酒花根、茎、叶、花各个部位,因此蔓延快,危害大。我团近年来由于防冶方法不当,危害情况逐年加重。以1981年为例,枝、叶发病率达81％,花蕾发病率达76％,当年减产20％。1982年由于加强了防治措施使病情显著减轻,当年啤酒花增产20％。现将发病情况与防治效果的调查简述如下: Hop downy mildew is an epidemic disease. Bacteria parasitic on hops roots, stems, leaves, flowers in all parts, so spread fast, harmful. In recent years, due to improper methods of prevention and cure, the harm situation has been aggravating year by year. In 1981, for example, the incidence of branches and leaves of 81%, the incidence of flower buds reached 76%, then cut 20%. 1982 due to the strengthening of prevention and control measures to significantly reduce the disease, then hops increased by 20%. Now the incidence and prevention and treatment of the survey as follows: