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在黑龙江、吉林和辽宁省的杨树上普遍存在着冰核活性（ＩＮＡ）细菌，经测定它们能在－４℃～－６℃温度下产生冰核活性。它们分属于３个属５个种或变种，即：菠萝泛生氏菌（ＰａｎｔｏｅａａｎａｎａｓＳｅｒａｎｏ１９２８）、噬夏孢子欧文氏菌（Ｅｒｗｉｎｉａｕｒｅｄｏｖｏｒａ（Ｐｏｎｅｔａｌ．）Ｄｙｅ１９６３）、丁香假单胞菌（Ｐｓｅｕｄｏｍｏｎａｓｓｙｒｉｎｇａｅｐｖ．ｓｙｒｉｎｇａｅＶａｎＨａｌ１９０２）、丁香假单胞菌流泪致病变种（Ｐ．ｓｙｒｉｎｇａｅｐｖ．ｌａｃｈｒｙｍａｎｓ（Ｓｍｉｔｈ＆Ｂｒｙａｎ）Ｄｙｅ１９７８）和丁香假单胞菌未定变种（Ｐ．ｓｙｒｉｎｇａｅｐｖｓ．）。自然条件下ＩＮＡ细菌增加了杨树的冻害；冻害的主要时期是在早春杨树萌芽阶段。在由真菌ＤｏｔｈｉｏｒｅｌａｇｒｅｇａｒｉａＳａｃｃ．引起的大斑型溃疡病病斑中分离到的ＩＮＡ细菌数量最多；而同一真菌引起的水泡型溃疡病病斑中分离到的ＩＮＡ细菌数量最少。在杨树干上接种ＩＮＡ细菌并经冷冻处理后，增加了Ｄ．ｇｒｅｇａｒｉａ的侵染，形成大斑型溃疡。证明冻伤和其它伤口是Ｄ．ｇｒｅｇａｒｉａ形成大斑型溃疡病斑的主要原因。提出了对ＩＮＡ细菌造成的杨树冻害和真菌性溃疡病进行综合?
Ice-nucleated active (INA) bacteria are prevalent in poplars in Heilongjiang, Jilin and Liaoning Provinces. They were found to produce ice nucleation activity at temperatures ranging from -4 ° C to -6 ° C. They belong to three genera and five species or varieties, namely: Pantoeaananas Serano1928, Erwiniauredovora (Ponetal.) Dye1963, Pseudomonas syringaev. Syringae Van Hal1902, P. syringaepv. Lachrymans (Smith & Bryan) Dye 1978) and P. syringaepvs. In natural conditions, INA bacteria increased the frost damage of poplar; the main period of frost damage was in the early spring poplar stage. In the fungus Dothiorelagregaria Sacac. The largest amount of INA bacteria was found in the lesions of large spotted ulcer disease caused by the same fungus. The number of INA bacteria isolated from blister-type ulcer disease caused by the same fungus was the least. INA bacteria were inoculated on the poplar trunk and chilled, increased by D. gregaria infection, the formation of large spot type ulcers. Prove that frostbite and other wounds are D. gregaria The main reason for the formation of large patchy ulcers. Proposed INA bacteria caused by poplar frost damage and fungal ulcer disease synthesis?