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1999～ 2 0 0 0年通过系统观察病情明确 ,榨菜全生育期均能感染根肿病 ,侵染时期早迟与病害症状发展及产量损失程度差异较大。根据榨菜肿瘤显现部位、大小及整株受害程度和产量损失 ,将榨菜根肿病病情严重度分为0～ 4级
From 1999 to 2000, the pathogeny was clearly observed in the systematic observation, and clubroot disease was infected during the whole growth period of tuber mustard. The development of the disease symptom and the degree of yield loss differed greatly between the early and late stages of the infection. According to the tubercle tumor site, size and whole plant damage and yield loss, the severity of clubbed club disease severity is divided into 0 to 4