Rice bastard disease prevention and control method

Symptoms: After Bacillus subtilis occurs in rice, the internodes of the diseased plants grow and grow thin and high, the plants are light in color, the leaves are narrower than the normal plants, and there are uncertain fibrous roots in or outside the leaf sheath on the node. Rice The stalk has white mold inside and turns pale red, sometimes black dots. The diseased plants had earlier heading, smaller panicles and less grain, or became unreal. Plants that died of disease were eared earlier, had smaller panicles, and had fewer kernels or became indistinct. The dead plants had light red or white mold on the surface, and there was a light red moldy layer outside the inside and outside burr seams of diseased grain husks. Pathogenesis and transmission route: The pathogen of rice bakanae disease overwinters on grain and straw, and the sick seed or rice straw is used the following year. The pathogenic bacteria invade from the bud or sheath of the seedling, causing the seedling to become disease-prone. After the diseased seedlings were transplanted, the pathogens were brought to the field, causing the onset of rice seedlings. When rice heading blossoms, the pathogen spreads through the wind and rain to the flower, so that the grain and straw with bacteria, circulating infection damage rice. Control methods: The prevention and treatment of rice bakanae disease focuses on the treatment of seeds. a, use disease-free seed retention seeds. This is a more reliable and effective method. b. Strictly disinfect the seeds. Use 50% carbendazim 100 g, add water to soak 50 kg of seed; or 35% of yamiaoling 120 g, add water to soak 50 kg of seed; or 3% of lime water to soak seeds for 48 hours. It must be noted that the liquid level must be 15 cm to 20 cm above the seed level for seed absorption. At the same time, in the soaking process, the liquid surface remains stationary, and cannot be stirred halfway, nor can it be reused to ensure suffocation. c. Whether it is in Putian or Datian, the diseased plants should be unplugged in time to prevent the expansion of infection. d. Properly handle the diseased rice straw, and it should not be thrown indiscriminately. It must not be stacked on the head of the fields. It should not be used as a cover for seed germination. It cannot be used for tying bundles of stalks. It can focus on high-temperature stacking, serious or fire.