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桑树细菌性疫病在山东已调查的12个县、市均有发生。主要有黑顶、茎裂、缩叶和叶斑4种症状。5月底至6月初症状开始出现,7～8月份为发病盛期。发病率一般为5～10％,重者可达40％以上。对病原菌的鉴定结果表明,病原菌为丁香假单胞杆菌,桑树致病变种(Pseudomonas syringae P.V.mori)。测试的四个菌株(Pm_1、Pm_5、Pm_(31)、Pm_(35)除对个别的糖、醇利用能力有分化外,其生理生化性状基本一致。
Mulberry bacterial disease has been investigated in Shandong 12 counties and cities have occurred. Mainly black top, stem split, leaf and leaf spot 4 kinds of symptoms. The end of May to early June symptoms began to appear, 7 to August for the peak incidence. The incidence is generally 5 to 10%, severe up to 40% or more. Identification of pathogenic bacteria showed that the pathogen was Pseudomonas syringae Pseudomonas and Pseudomonas syringae P.V.mori. The four strains tested (Pm_1, Pm_5, Pm_ (31), Pm_ (35) except for individual sugar, alcohol utilization ability differentiation, the physiological and biochemical characteristics of the same.