油菜黑斑病是油菜的常见真菌性病害之一,在全国各地均有发生,以东北、华北等地发病较重,尤其在温室和大棚中对油菜栽培影响很大。寄主植物除油菜外,尚有芜菁、萝卜、芥菜、白菜等十字花科蔬菜。主要为害叶片、叶柄、茎和角果。一、发病症状(表1) Rape black spot is one of the common fungal diseases of rape. It occurs in all parts of the country, with heavier incidence in Northeast and North China, especially in greenhouse and greenhouse. In addition to the host plant rape, there are turnip, radish, mustard, cabbage and other cruciferous vegetables. The main damage leaves, petioles, stems and fruit. First, the onset of symptoms (Table 1)