Symptoms are also known as bacterial sheath rot, which damages leaves, sheaths, stems, nodes, ears, branches, and grains. At the beginning of the disease, the leaf was brownish and immersed in small spots. Afterwards, it expanded into a spheroidal or irregular russet stripe with yellow halos on the edges. The center of the lesion was gray-brown. The lesions often fused into large strips, causing partial leaf necrosis. Bacteria pus. Lesions of leaf sheaths mostly occurred on ear blasts before young panicles were extracted. The lesions were red-brown and short-striped. After fused into water-stained irregular large spots, the central gray-brown was brown and tissue necrosis occurred. The leaf sheath was peeled off, and black-brown streak was found on the stem. When the flag leaf was seriously ill, no panicle could be extracted. Spike, glume and other parts of the victim produce near-round brown spots, in serious cases, the whole glume is brown, and deep in the rice. Grain lesions are easily confused with rice leaf blight, and microscopic examination shows that there is a large amount of bacterial pus overflow at the incision.

Pathogen Pseudomonas syringae pv.syringae Van Holl said P. syringae pv. Rod-shaped, solitary, size 1-30.8-1.0 (μm), 2-4 polar flagella. The broth was cultured on a plate medium with a white, round, smooth surface with a ring-shaped ring pattern. Transmission routes and pathogenic conditions The pathogens overwinter in seed and diseased tissues. From the wound into the host, but also from the water hole, stomatal invasion. Bacteria can survive in water for 20-30 days and spread with water. Heavy rain and typhoons can aggravate the disease. Partial application of nitrogen fertilizer, excessive irrigation or irrigation water, easy to disease. Acidic soil disease is heavy.

Prevention methods (1) Strengthen quarantine to prevent the transfer of diseased seeds. (2) Shallow irrigation to prevent field water flow. Formula fertilization, avoid partial nitrogen fertilizer. Remove the weeds in the field and dispose of straw. (3) Chemical control See bacterial blight of rice.

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