烟草青枯病是一种细菌性病害。烟株感病后,叶片迅速枯萎,但仍保持绿色,故称青枯病。苗期发病,常导致成片枯死,引起大量缺苗,严重时发病株率高达80%以上。一旦发生,不仅蔓延快,而且很难治疗。成株期一般下部叶片先行凋萎,然后向上发展,叶片失水干缩,植株矮化、枯死。初期凋萎的 Tobacco bacterial wilt is a bacterial disease. Tobacco plant disease, the leaves quickly withered, but still maintain the green, so that bacterial wilt. Seedling incidence, often lead to dead, causing a large number of lack of seedlings, the incidence of severe cases of up to 80% or more. If it happens, it will not only spread quickly, but also be difficult to treat. Adult lower leaves generally withered first, and then upward development, dry leaves dehydration, dwarf plants, dead. Early wilting