What are the symptoms of bacterial red stripe disease of sorghum?
What are the symptoms of bacterial red stripe disease of sorghum? Please provide an introduction. The symptoms of bacterial red stripe disease of sorghum mainly damage the leaves. Leaf spots initially appear as water-soaked, narrow, fine small streak spots, which after expansion turn light reddish-brown. Some lesions become brown in the center with red edges, and broad, long oval lesions appear intermittently on the streaks. Some...
What are the symptoms of bacterial red stripe disease of sorghum? Please provide an introduction.
Symptoms of bacterial red stripe disease of sorghum
It mainly damages the leaves. Leaf spots initially appear as water-soaked, narrow, fine small streak spots, which after expansion turn light reddish-brown. Some lesions become brown in the center with red edges, and broad, long oval lesions appear intermittently on the streaks. Sometimes the lesions can cover most of the leaf area. When humidity is high, small granular bacterial ooze can be seen exuding, which after drying becomes a scaly thin layer. It is distributed in Hebei, Henan, Shandong, Jiangsu, Hubei and other provinces.
Pathogen of bacterial red stripe disease of sorghum
Xanthomonas campestris pv. holcicola (Elliott) Dye, synonym X. holcicola (Elliott) Starr et Burkholder, called Xanthomonas campestris pv. holcicola or pv. holcicola (Xanthomonas campestris pv. holcicola). The bacterial cells are short rod-shaped, size 1.05-2.4 x 0.49-0.9 (um), single, in pairs or in short chains, with capsules, without spores. Single polar flagellum, Gram stain negative, aerobic. The suitable growth temperature is 28-30°C, maximum 36-37°C, minimum about 4°C. It is killed at 51°C after 10 minutes. Besides infecting sorghum, this bacterium can also harm foxtail millet.
Transmission routes and disease conditions of bacterial red stripe disease of sorghum
The pathogenic bacteria overwinter on diseased residues and invade the host through stomata. A temperature of 25-30°C, rainy and windy weather, especially when these conditions are encountered in the early growth stage, are favorable for the occurrence and spread of this disease.
Control methods for bacterial red stripe disease of sorghum
(1) Select disease-resistant varieties.
(2) Strengthen field management to prevent infection.
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