Control of Bad Seedling Disease of growing Rice

Symptoms: after the occurrence of evil seedling disease in rice, the internodes of the diseased plants elongate, grow thin and tall, the plant color is lighter, the leaves are narrower than the normal plants, there are indefinite fibrous roots inside or outside the leaf sheath on the nodes, and there are white mildew in the rice stalk, and then become reddish, sometimes black dots. The diseased plants heading earlier, the panicles are smaller, and the grains are few, or become unfilled grains. There are light red or powdery mildew on the surface of the dead plant, and there is a light red mildew layer at the suture of the inner and outer glumes of the diseased grain husk.

The pathogen of rice evil seedling disease overwinters on grain and straw, and if diseased seeds or straw are used the next year, the pathogen will invade from the coleoptile or wound of the seedling, causing the seedling disease to grow. After transplanting the diseased seedlings, the germs are brought to the field, causing the disease of rice seedlings. When the rice is heading and blooming, the pathogen is transmitted to the flower organ through wind and rain, which makes the grain and straw carry the pathogen and cause cyclic infection to damage the rice.

Control methods: the prevention and control of rice evil seedling disease focuses on the treatment of seeds.

Strictly disinfect the seeds. Soak the seeds with 50% carbendazim 100 grams, add 50 kg water, or 35% carbendazim 120 grams, soak the seeds in 50 kg water, or 3% raw lime water for 48 hours. It must be noted that the liquid level must be 20 cm higher than the seed level for seed absorption. At the same time, in the process of seed soaking, the liquid level of the drug remains static, and it can not be stirred or reused to ensure that the bacteria are suffocated.

Whether in the seedling field or in the field, diseased plants should be pulled out in time to prevent the expansion of infection. Properly handle diseased straw, do not throw it casually, can not be piled on the edge of the field, can not be used as seed germination mulch, can not be used to bind seedling handle, can concentrate high temperature pile and burn with fire seriously.