Symptoms mainly affect the middle stems and leaf sheaths. When the corn has more than 10 leaves, the leaf sheath begins to rot and the diseased tissue begins to soften, giving off an odor. The lesions on the leaf sheaths are irregularly shaped, the edges are reddish-brown, and the disease is
Healthy. At the border of the organization, water-spraying is particularly noticeable. When the humidity is high, the lesion rapidly expands upwards and downwards. In severe cases, the plants often fall above the diseased part 3-4 days after the onset of disease, overflowing the yellow-brown rotten bacillus liquid and spreading slowly under dry conditions. However, the disease department is also easily broken, causing no heading or fruiting. Jiangsu, Henan, Shandong, Sichuan, and Guangxi have occurred. In recent years, Sichuan has suffered heavy damage. There have also been serious reports in Xinxiang, Henan. (Right) Pathogen Erwinia chrysanthemi pv.zeae (Sabet)Victoria, Arb01eda et Munoz Synonyms E.carotovora f.sp.zeae Sabet Erwinia Erwinia Maize Infected species, genus bacteria. Fungus rods, rounded at both ends ,Single,even double-stranded, Gram-negative, weekly flagella 6-8, no spores, no film, size 0.851.6 (um). Colonies are round, low-grade, milky, and slightly transparent. In addition, Pseudomonas zeae Hsi.et Fang. Pseudomonas syringae has been reported as the pathogen of the disease. Transmission routes and pathogenic conditions The bacteria may overwinter on the soil in the diseased body, and invade from the plant's stomata or wound in the following year. When the corn is 60cm high, the tissue is tender and susceptible to disease, and the wound caused by pest damage is conducive to invasion of the bacteria. In addition, pests carrying pathogens also play a role in transmission and inoculation, such as corn borers, cotton bollworms and other insect population, the incidence is heavy, high temperature and humidity conducive to disease; average temperature of about 30 °C, relative humidity higher than 70% can be the disease; Temperature 34°C, relative humidity 80%, rapid expansion. Low-lying or poor drainage, excessive density, poor ventilation, excessive nitrogen fertilizer application, heavy wounds. Rotation, high sorghum cultivation, well-drained and appropriate proportion of nitrogen, phosphorus, and potassium Block plants are robust and have a low incidence. Prevention and control methods (1) Agricultural control shall be carried out in rotation so as to avoid continuous cropping as much as possible. After the harvest, the pastoral area shall be cleaned in a timely manner, the diseased plants shall be properly handled, the source of bacteria shall be reduced, the field management shall be strengthened, the cultivation shall be conducted with sorghum, and flood irrigation shall be strictly prohibited, and drainage shall be promptly conducted after rain. To prevent moisture retention, (2) timely pest control and disease prevention began to pay attention to the prevention of corn borer, cotton bollworm and other pests, timely spraying 50% phoxim EC 1500 times liquid. (3) after the discovery of diseased plants in the field, timely removal, carrying Out of the field, beryllium fertilizer or concentrated burn. 4) If necessary, peel off the leaf sheath at the early stage of disease, and apply lime water on the diseased part. Use 1kg of hydrated lime to brush the water with 5-10kg. (5) Spray on the maize bell mouth 25 % Ye Ling Ling or 20% Ye Kuangjing WP plus 60% thiazole or thiazole aluminum or 58% metalaxyl. Manganese zinc wettable powder 600 times has preventive effect. (6) Spray immediately after onset 5% of Yinxueqing agent 600 times or agricultural streptomycin sulfate 4000 times, better control effect.
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