Rice blast disease hazard symptoms and prevention methods


Rice blast is one of the most important diseases in rice. The northern part is most prominent in the stem stalk. During the growth period of rice, all parts of the plant can be affected, which is a fungal disease. Due to the different damage period and location, it is divided into nursery, leafhopper, thrift, panicle neck and grain mites. Its occurrence is characterized by the fact that the bacteria are overwintering on the diseased straw and diseased valleys with hyphae and conidia.
I. Hazard symptoms 1. The nursery mainly occurs on the leaves of the seedling stage, forming brown, fusiform or amorphous lesions, sometimes forming a gray-green mold layer on the lesions.
2. Leaf mites generally occur after the tillering period. Common typical lesions, fusiform.
3. Frugality occurs mostly in the first to second nodes under the flag leaf. It is initially dark brown and small, gradually expanding. The lesion can surround part or all of the knot, making the knot black, and the disease is shrinking and sag. The rice plant is broken and lodging, which affects the fruiting, grouting, and even the formation of white ear.
4. The neck scorpion occurs on the neck, cob, and branch. The lesion is dark brown at the beginning, and then expands up and down to form dark brown streaks. The lighter affects the firmness, the paddle and even the granules. The white ear is formed and it is not strong.
Second, prevention and treatment methods 1, rational fertilization, increase the application of organic fertilizer, phosphorus and potassium fertilizer;
2, scientific water, avoid deep water flooding, keep the field moist, even pay attention to clear ditch drainage in rainy days;
3, 70% methyl thiophanate WP, 70 g / mu in the early stage of the disease or from the ear formation period to the booting stage, 50 kg of water spray.
4, Sui 瘟 should focus on the protection at the heading stage, 2 to 3 days before the break, 40% of the Fuji No. 1 emulsifiable milk 75-100 ml or 75% tricyclazole 30 grams of water 50-75 kg spray per acre, 7 After 10 days, take the medicine again according to the weather conditions.


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