烟草根茎病害的识别与防治:这一类病害也可以说是土传病害,主要是黑胫病、根黑腐病、青枯病和根结线虫病等多种病害的总称。近年来由于有些烟田没有坚持轮作和施肥不当,在某些烟区危害又严重起来了,例如河南、安徽、山东、湖南等烟区的不少地块又发生严重的黑胫病;根结线虫病在河 Tobacco rhizome disease identification and prevention: This type of disease can also be said that soil-borne diseases, mainly black shank, root black rot, bacterial wilt and root knot nematode disease and other diseases collectively. In recent years, some tobacco fields did not insist on rotations and improper fertilization. In some of the tobacco farms, the damage was serious again. For example, serious black shank regions occurred in many plots in areas of Henan, Anhui, Shandong and Hunan. Root knot Nematode disease in the river