Rice pest control: what is rice downy mildew?

What is rice downy mildew? What are the hazards of rice downy mildew? How to prevent and cure rice downy mildew? Please guide the harm of rice downy mildew: Rice downy mildew generally appears symptoms in the late stage of seedling field, and the symptoms are significant in the peak tillering stage. The diseased plant is dwarf, the leaf color is light green; the yellow-white dot on the leaf is round or oval, often connected into a linear shape; after booting, the diseased plant is significantly dwarfed, and the plant height is less than 1/2 of the healthy plant. The leaves are short and thick, and the heart leaves are yellow and white, sometimes bent or twisted, not easy to pull out, and the lower leaves gradually die. The damage to the leaf sheath is slightly inflated, with irregular ripples on the surface, sometimes wrinkling or twisting. The tillers of diseased plants decreased, one plant was susceptible, and all the other tillers were susceptible. The spike is deformed, can not be pulled out normally, the spike is small and not solid, and sometimes the spikelet is degenerated into a leaf. The control methods of rice downy mildew are as follows: 1. Improve the drainage and irrigation system of the diseased field so that the seedlings will not be flooded. 2. Select the high-lying field as the seedling field, and pay attention to the management of the seedling field to prevent flooding. 3. Pull out the diseased plant in time to control the spread of the disease. 4. Common disease areas and flooded seedling fields can be sprayed with 50% carbendazim wettable powder or 50% topiramine wettable powder, 50-75 grams per mu, spray with water. Commonly used agents: 50% carbendazim wettable powder or 50% topiramine wettable powder. Click to get more rice planting techniques click to get more food crop planting techniques