symptom
The main damage leaves. The leaf spot was a small strip of water-stained spot, which became light reddish brown after expansion. In some lesions, the center becomes brown, with red edges, and a wide, long ovoid lesion appears intermittently on the stripe. Sometimes the lesion can cover most of the area of ​​the leaf. When the humidity is high, musculoskeletal seedlings of small granular bacteria can be seen to overflow, and after drying, they become thin scaly layers. Distributed in Hebei, Henan, Shandong, Jiangsu, Hubei and other provinces.
pathogen
Xanthomonas campestris pv. holcicola (Elliott) Dye, synonymous X. holcicola (Elliott) Starr et Burkholder said that the Xanthomonas campestris sorghum gall disease or villous turfgrass lesions (sorghum bacterium Bacterial strep Xanthomonas Xanthomonas). Bacterial short rods, size 1.05?2.40.49?0.9(um), solitary, twin or short chained, with decidua, no spores. Monopolar flagellum, Gram-negative, aerogenic. The suitable growth temperature is 28 to 30°C, the highest 36 to 37°C, and the lowest about 4°C. 51°C lethal for 1 minute. In addition to infestation of sorghum, the bacterium can also harm millet.
Transmission routes and conditions
The pathogenic bacteria overwinter on the sick and invade the host from the stomata. The temperature is 25°C to 30°C. It is rainy and windy, especially when these conditions are met in the early stages of growth, which will facilitate the occurrence and expansion of the disease.
Control methods
(1) Selection of disease-resistant varieties.
(2) Strengthen field management to prevent infection.
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