甘肃菊科牧草霜霉病调查研究

Investigation and Study on downy mildew of compositae forage in Gansu province

经调查,甘肃12种菊科牧草上发生霜霉病,由盘霜霉属的7个种、轴霜霉属1个种和首次在甘肃发现的类霜霉属2个种侵染所致,并发现鉴定盘霜霉新组合种和变种各1个。霜霉病一般在河西地区较陇东、陇南发病严重,有的发病率高达40%以上。

the species and incidence of downy mildew of compositae forage in Gansu province were investigated in this paper, there are 12 forage species can be infected with downy mildew, which include 7 species of Bremia, 1 species from plasmopara,2 from parapernospora, One combined species and one mutant were newly found The disease incidence in Hexi is higher than that in Longdong and Longnan,where the incidence can be as high as 40%Keys words: Compositae; Bremia; plasmopara;parapernospora; downy mildew; new combined species; new mutant; disease incidence