霜霉病俗称“烘病”、“跑马干”等,主要危害十字花科蔬菜。国内各地普遍发生,危害十分严重,一般秋冬萝卜比夏秋萝卜发病重。苗期至采种期均可发生,主要危害叶片,其次是茎、花梗、种荚。一、识别要点(表1)二、发生规律病原是鞭毛菌亚门、霜霉属的十字花科霜霉菌的真菌。 Downy mildew commonly known as “roasted ”, “horse race ”, etc., the main hazards cruciferous vegetables. Common occurrences across the country, the damage is very serious, the general fall and winter radish than summer and autumn turnip incidence. Seedling to the seedling stage can occur, the main hazard leaves, followed by stems, pedicels, seed pods. First, the identification points (Table 1) Second, the occurrence of regular pathogen is flagellin sub-door, downy mildew cruciferous fungi fungi.