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Symptoms and damage of canker disease of Populus × euramericana caused by the bacterial pathogen, Lonsdalea populi. (A) Early symptoms with abundant sour and white, sour exudate (black arrow) on poplar trunk; (B) Late brown bark symptoms in the summer month, brownish exudations (red arrow). (C) Overwintering canker with large bark necrosis (white arrow) and fresh necrotic bark (blue arrow). (D) Diseased poplar blown down by the wind in the field.
