根据病害的发生时期、症状和病原菌的生理生化的特性、血清学反应、致病性等方面的比较研究的结果,证明桑细菌性枝枯病的病原细菌也是一种丁香假单孢杆菌(Pseudomonas syringae Van Hall),但它不同于桑细菌性疫病的病原细菌[另一个丁香假单孢杆菌(Pseudomonas syringae pv.mori)]。所以我们认为桑细菌性枝枯病是桑树的一种新病害。 According to the time of disease, the symptom and the physiological and biochemical characteristics of pathogenic bacteria, serological reaction, pathogenicity and other aspects of the comparative study results show that the pathogenic bacteria of bacterial blight is a kind of Pseudomonas syringae Syringae Van Hall), but it is different from the pathogenic bacteria of Sulzer’s bacterial blight [another Pseudomonas syringae pv. mori]. Therefore, we think that bacterial wilt disease is a new disease of mulberry.