Sorghum bacterial red streak

The main symptoms are damage to leaves. At first, the leaf spot showed a small, narrow, watery spot, and after expansion, it became light reddish brown. Some plaques turn brown in the center and red on the edges, and wide long oval spots appear intermittently on the stripes. Sometimes the disease spot can cover most of the leaf area. When the humidity is high, the pus of small granular bacterial seedlings can be seen to overflow and become scaly thin layer after drying. Distributed in Hebei, Henan, Shandong, Jiangsu, Hubei and other provinces. Pathogen Xanthomonas campestris pv. Holcicola (Elliott) Dye, synonym X. holcicola (Elliott) Starr et Burkholder is called Xanthomonas campestris var. sorghum or Xanthomonas aeruginosa (Xanthomonas sp.). The cell is short rod-shaped, 1.05 ml 2.4 × 0.49 mi 0.9 (um), solitary, twin or short chain-shaped, capsular and spore-free. Unipolar flagella, gram-negative, aggressive. The suitable growth temperature is 28 ℃ 30 ℃, the highest 36 ℃ 37 mol, and the lowest 4 ℃. 51 ℃ died in 10 minutes. The bacteria can not only infect sorghum, but also harm millet. Transmission route and pathogenic conditions the pathogenic bacteria overwintered on the disease remains, invaded the host from the stomata, the temperature was 25 ℃, and the weather was rainy and windy, especially in the early growth stage, which was beneficial to the occurrence and expansion of the disease. Control methods (1) selection of disease-resistant varieties. (2) strengthen the management of farmland to prevent infection.