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1997～2001年在辽宁省的露地及大棚番茄上分离得到4个菌株,接种番茄幼苗上,发病症状与自然发病症状完全一致,并从接种病株上重新分离到此病原细菌,经革兰氏染色、菌体形态、培养性状、生理生化反应等鉴定,确认该病原菌为丁香假单胞番茄致病变种（Pseudomonas syringae pv.tomato（Okabe）Young,Dye＆Wilkie）.
From 1997 to 2001, four strains were isolated from the open field and the greenhouse tomato in Liaoning Province. The inoculated tomato seedlings had the same symptom as the naturally occurring symptom, and the pathogenic bacteria were isolated again from the inoculated diseased plants. The pathogen was identified as Pseudomonas syringae pv. Tomato (Okabe Young, Dye & Wilkie).