一、发病症状坚实的组织受侵染后,先呈水渍状,逐渐腐烂,最后患部水分蒸发,组织干缩。柔嫩的组织受到侵害时,呈浸润半透明状,后呈褐色,随即变为黏滑软腐状。大白菜在田间发病,多从包心期开始。起初植株外围叶片在烈日下表现萎垂,但早晚仍能恢复。随着病情的发展,受感染外叶不再恢复,以至露出叶球。 First, the symptoms of a solid tissue affected by infection, the first water-like, gradually decay, and finally the affected area of ​​water evaporation, tissue shrinkage. Soft tissue when infiltrated, was infiltrated translucent, then brown, then become a soft slippery sticky slippery. Chinese cabbage disease in the field, and more from the beginning of the package phase. At the beginning of the plant peripheral leaves in the performance of the weeping Vertigo, but sooner or later still be able to recover. As the disease progresses, the affected outer leaves no longer recover, leaving the leaflets exposed.