Symptoms mainly affect the leaves, leaf sheaths, stem sections and internodes. The leaves were infected with water-stained streak. The color of the lesions turned yellow-brown afterwards, and finally it was dark brown. The lesions are long and oval, and there are also shallower middle colors. The diseased leaf sheaths formed dark-brown elongated strips along the veins, which were mostly associated with lesions on the leaves, and all of the sheaths became light brown. Stems were mainly infected with diseased stems. The diseased part was thick brown, and the interior was also discolored. Afterwards, it could be expanded to the internodes. The early culm was gradually corrupted and the leaves turned yellow, causing the whole plant to die.
Pathogen Pseudomona syringae pv.striafaciens (Elliott) Young et al. Synonyms Pseudomonas striafaciens (Elliott) Starr et Burkholder said Pseudomonas syringae streaked lesions, a bacterium. Bacteria rod-shaped, both ends of a circle, size 1.0-2.50.4-1.0 (μm), with 1-2 poles of monopolar flagellum, Gram-negative, on the PDA medium, colonies white, round, intermediate bulge Whole. Developmental optimum temperature 22-24 °C, 50 °C lethal 10 minutes.
Transmission routes and disease conditions The bacteria can survive for a long period of time under dry conditions. The germs on dry seeds can live to the autumn season, mainly relying on the propagation of wheat germs.
The control method refers to wheat scattered smut. The straw of the diseased field is treated in time.
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