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1986—1989年从南京、苏州、常州等市郊采集分离到花菜、甘蓝黑腐病菌,对其致病性、寄主范围及传播途径进行研究,结果表明常州花菜及甘蓝黑腐病菌致病力最弱,接种发病率分别为29.1％和47.4％,其它地区黑腐病菌接种发病率均在80％以上。在接种的5科16种植物中,黑腐病菌能侵染其中4科14种,可分为四种类型。种子带菌是黑腐病的最主要侵染源,病株花菜种子带菌率1987年为14.67％,1988年为17.31％。用0.1％强氯精浸种20分钟,消毒效果达100％。江苏省黑腐病菌存活于土中的时间不长,带菌土不是黑腐病的主要初侵染源。菜青虫(Pieris candia Sparrman)虫体带菌量为2.394×10~7CFU/克,是花菜、甘蓝生长期中黑腐病再侵染的重要媒介,菜青虫为害程度与黑腐病发生密切相关。
1986-1989 from Nanjing, Suzhou, Changzhou and other suburbs collected cauliflower, cabbage black rot pathogen, its pathogenicity, host range and route of transmission, the results show that the Changzhou cauliflower and Cabbage black rot pathogen was the weakest , The incidence of inoculation were 29.1% and 47.4%, the incidence of black rot pathogen in other areas were more than 80%. Among 5 families and 16 species inoculated, black rot bacteria can infect 4 families and 14 species, which can be divided into four types. Seed germination was the most important source of black rot disease. The incidence of cauliflower seed germination was 14.67% in 1987 and 17.31% in 1988. With 0.1% strong chlorine soaked seeds 20 minutes, disinfection up to 100%. The black rot germs in Jiangsu Province survived in the soil for a short period of time. The contaminated soil was not the primary source of initial black rot disease. Pieris candia Sparrman was 2.394 × 10 ~ 7CFU / g. It is an important medium for re-infection of black rot in cauliflower and cabbage. The damage degree of cabbage and pest is closely related to the occurrence of black rot.