烟草青枯病又称烟瘟 ,是一种由Ｒａｌｓｔｏｎｉａｓｏｌａｎａｃｅａｒｕｍ引起的细菌性病害 ,是一种典型的维管束病害。最显著的症状是枯萎 ,一旦发病即可造成全株死亡 ,对烟草的产量和质量影响极大 ,是烟草上一大毁灭性病害 ,特别在苗期 ,此病致幼苗成片枯死 ,造成大量缺苗 Tobacco bacterial wilt, also called plague, is a bacterial disease caused by Ralstoniasolanacearum and is a typical vascular disease. The most obvious symptom is withering. Once the disease is caused, the death of the whole plant can be caused. It has a great impact on the yield and quality of tobacco. It is a major devastating disease on tobacco, especially in the seedling stage. Lack of seedlings