烟草根结线虫病、黑胫病和青枯病是贵州省烤烟作物上的主要根茎病害。近年来在江口、石阡、金沙、福泉等县的部分乡（镇）发病日趋严重，在一定程度上限制了优质烟叶生产的发展。这３种病害分别由线虫、真菌和细菌所引致，在田间常形成复合侵染，给防治带来很大的困难。到目前 Tobacco root-knot nematode disease, black shank and bacterial wilt are the main rhizome diseases on flue-cured tobacco in Guizhou Province. In recent years, some townships (towns) in Jiangkou, Shiqian, Jinsha and Fuquan counties have become more and more serious, restricting the development of high-quality tobacco production to a certain extent. These three kinds of diseases are caused by nematodes, fungi and bacteria, respectively, and often form a complex infection in the field, which brings great difficulties in prevention and control. until now