After rice is flooded, it is prone to downy mildew . For rice downy mildew, it is necessary to use reasonable and scientific methods for prevention and treatment.
Rice downy mildew is also known as yellowing and atrophy, and rice begins to show symptoms in the late stage of the field. The diseased plant is dwarfed, the leaves are light green, and round or elliptical yellow-white spots appear on the leaves, often forming a line. The heart leaves are yellowish white, twisted, and difficult to extract. The damaged leaf sheath is slightly loose and the surface is wrinkled or twisted. The diseased plants are reduced in tillering, the severely ill strains are not able to boot, and the lightly ill strains can be booted but not extracted, wrapped in the sheath leaf sheath, or arched from the side thereof into a fist shape, the ears are small and false, and the distortion is deformed. The disease is a fungal disease. The pathogen mainly overwinters the oospores in the sick body or soil. When the temperature and humidity conditions are suitable in the next year, the bacteria produce zoospores to infect and spread by running water. Under high-humidity conditions, the seedlings are affected by flooding.
After the occurrence of downy mildew in rice, the method for controlling the drug in the early stage of the disease has a certain control effect with a bactericide 25% metalaxyl WP 700 times liquid or 50% enoyl morpholine WP 1500 times liquid spray. Spray again in ~10 days. For rice downy mildew, comprehensive measures should be taken to prevent it. Choose a high-altitude field to make a field, build a drainage system, and prevent flooding of rice fields. In the seedling stage, the diseased plants should be removed and the weeds in the fields should be removed.
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