Rice bacterial streak disease
Symptoms also known as thin strips, streak disease. The main damage leaves. At the beginning of the lesion, dark green water was immersed in small spots. It quickly expanded from dark veins to yellow-brown thin strips. The size was about 110 mm. Both ends of the lesions were infiltrating green. The lesions often overflow with a lot of bead-like yellow bacteria and pus, and they are colloidal pellets after drying. Bacterial plaques are often covered with bead-like bacterial fluids. In severe cases, the striae merge into irregular yellowish brown to white blotchy, similar to white leaf blight, but many semi-transparent stripe spots are seen on the light. When the disease is severe, the leaves curl and the field appears yellowish-white. The pathogen Xanthomonas oryzae pv.oryzicola (Fang, Ren, Chu, Faan, Wu) Swings called Xanthomonas oryzae stripe-pathogenic lesions, is Xanthomonas bacteria. Bacteria solitary, shortly rod-shaped, 1-20.3-0.5°C (μm) in size, one polar flagellate, negative Gram stain, no spore aponeurosis, colony round on broth agar, surrounding Neat, slightly raised in the middle, honey yellow. Physiological and biochemical reactions are similar to the bacterial leaf blight. The difference is that the bacteria can liquefy the gelatin, dehydration of the milk, and arabinose produce acid, which is insensitive to penicillin and glucose. The growth of the force is 28-30°C. Although the pathogenicity and performance traits of Xanthomonas oryzae are very different from those of Xanthomonas oryzae pv. oryzae, their heredity and physio-biochemical traits are very similar. Therefore, the fungus should be used as one of the Xanthomonas oryzae pv. variant. Prevention methods (1) Strengthen quarantine, include the bacteria in quarantine objects, and prevent the spread of carrier seeds from long distances. (2) Selection of hybrid (resistant) hybrid rice such as Gui 31901, Qinghuaxiao No. 6, Shuanggui 36, Ningjing No. 15, Zhenguixi No. 1, Qiugui 11, Shuangchao 25, Guangyou, Meiyou, Sanpei occupied No. 1, No. 15 and Boyou. (3) to avoid partial application, late application of nitrogen fertilizer, with phosphorus and potassium fertilizer, the use of formula fertilization technology. Avoid stringing water and deep water. (4) Chemical control See bacterial blight of rice.
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Transmission routes and pathogenic conditions The pathogens are mainly transmitted from rice seeds, rice straw, and self-producing rice carriers. They have become the primary source of infestation, and do not exclude the cross infection of wild rice or Lee's pupa. The bacteria mainly invade from the wound. The pyogenic bacteria can be re-infected after being transmitted by wind, rain, and dew. High temperature and humidity are conducive to disease. Typhoon rain causes wounds, and the disease is easily prevalent. Partial application of nitrogen fertilizer, irrigation too deep to increase the incidence.