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通过用不同方法接种证明,病原细菌可通过伤口和自然孔口侵染青菜(Brassica chinensis)的地上部分。青菜在整个生育期均感病,但在抽苔开花期及结果后感病性稍有下降。出苗至收获时的各个阶段,青菜健叶上都有病原细菌存活。病原细菌在土壤(含病残体)中可存活较长时间。
By vaccinating with different methods, pathogenic bacteria invade the aerial parts of Brassica chinensis through wounds and natural orifices. Green vegetables throughout the growing season are susceptible, but after the bolting flowering and the results of a slight decline in susceptibility. Emergence to harvest at all stages, the healthy leaves of cabbage are pathogenic bacteria to survive. Pathogenic bacteria in soil (including sick) can survive for a long time.