Symptoms of China's new rice disease. Occurrences occurred in Guizhou Province and Taiwan, while those in foreign countries were mainly distributed in Japan. After the ear full of rice, the green spikes of the ripening period stood up, and the infected grains appeared pale as if they were dry and withered. Gradual changes were pale to light yellow-brown. The apex or base of the inside and outside nymphs became purple-brown, and the protector was also purple-brown. About 10-20 grains of diseased ear were affected, and more than half of the diseased grains were dead. Severely affected rice ears were erect and not bent. Most of them were not pods. All turned gray or yellow brown to dark brown, the boundaries between the disease and the Ministry of Health are obvious. Pathogen Pseudomounas glumae kurita et Tabei called Pseudomonas glumae) rice bacteria Pseudomonas cinerea) is a bacterium. Gram-negative, with 2-4 flagellates, short rods, decidua, no spores, size 1.5-2.50.5-0.7 (μm), positive oxidase activity, cannot use rhamnose Acid production. On the PDA medium, the colonies are small and yellowish milky, and can use xylose, arabinose, glucose, fructose, glycerol and the like to produce acid without producing gas. Can use milk, coagulate and digest. Gelatin liquefaction. Does not produce defects and H2#S but produces NH#3. Nitrate does not reduce. The growth temperature limit is 11-40°C, and the optimum temperature is 30-35°C. Transmission routes and disease conditions Grain carriers, sowing diseased grains, in the case of appropriate conditions, that is, high temperature and multiple sunshine at the heading stage, less rainfall, easy to disease, disease resistance of different varieties have obvious differences. There are susceptible diseases such as Tainan No. 6 and Hsinchu, and Taiwan’s Kaohsiung City and Fengjin are extremely resistant to disease.
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Prevention methods (1) Strengthen quarantine and prevent the expansion of wards. (2) Selection of disease-resistant varieties. (3)Spray 2% kasugamycin 250 times or 60% chlorothalonil wettable powder 500 times, 12% green milk copper 500 times, 47% Garinon at 5% heading Wettable powder 600-700 times, 53.8% can kill 2000 dry suspensions 1200 times.