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In March 2020, a bacterial streak and rot symptom was observed on the onion (Allium cepa L.) leaves in Akita Prefecture of Japan. On the beginning, oval and dark-greenish water-soaked lesions with grayish-white necrotic center, 2-3 mm in diameter, appeared on the middle or the tip of upper leaves. Lesions, frequently surrounded by light yellow halo, expanded along veins and overlapped together. As lesions grew, the center of the lesions turned to light brown necrosis. The basal areas of diseased leaves often rotted, causing the