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烟草黑胫病的发生，不需依赖根结线虫浸染．在消毒土壤中，单独接种黑胫病菌照样发病．然而，黑胫病和根结线虫同时混合接种时．发病较重．表明根结线虫的存在，有加重的作用
The occurrence of tobacco black shank does not depend on root-knot nematodes. In disinfected soil, blackhead-like bacteria were inoculated alone. However, black shank and root-knot nematodes are mixed simultaneously. Serious onset. Show that the existence of root-knot nematode, a heavier role