Rice blast is one of the main diseases of rice cultivation. It can occur in various growth stages. According to the disease stage and location, it is called nursery, leaf mites, ear mites and thrift. Among them, the neck and neck mites are the most serious, affecting the largest yield.
First, the prevention and control of rice blast
1. According to local conditions, select high-quality varieties resistant to disease
2 , cultivate strong, balanced fertilization, control of nitrogen fertilizer, phosphorus, potassium fertilizer
3. Reasonable close planting promotes the robust growth of rice plants and enhances disease resistance.
Second, strengthen cultivation management and improve the disease resistance of rice plants
1. From the transplanting to the effective tillering period, the main direction of fertilizer and water management is to promote early hair, fight for multiple ears, and lay a foundation for the ear. Therefore, generally, the base fertilizer should be sufficient, and the topdressing should be fast, paying attention to nitrogen and phosphorus. The combination of potassium and potassium (the base fertilizer should be selected from the special fertilizer for soil testing, and the ammonium fertilizer should be ammonium sulfate). 2, after transplanting seedling water (shallow irrigation) to promote early tillering, the appropriate control of water before the flood season to promote the long roots of rice plants, 1-2 inches of water at the heading stage, to meet the needs of flowering. Wet irrigation during the filling period, is conducive to later live The rod is mature to reduce the onset. If there is little or no application of panicle fertilizer, it is appropriate to carry out the top dressing.
Third, seize the key, timely spraying prevention and treatment, generally prevention and control of nursery, Qiaozhi Ye Yan, grabbing the ear.
1. Ye Wei: In the rice tillering period, it is necessary to strengthen the field inspection. The growing area and the last year's rice blast recurrence area should be strengthened. When the disease center is found to be immediately blocked, the "Fuji No. 1" therapeutic agent can be used. For example, acute type lesions appear on the leaves, especially increasing day by day. If the weather forecast will have rainy weather, large-area prevention should be carried out on the plots that have not been affected. It is possible to use "Tricyclazole" and other agents to prevent and properly dry the fields.
2, Sui 瘟: Because there is no high resistance to rice blast, so if the weather forecast has rainy or long time at the heading stage, the drug should be prevented immediately during the rupture period, and the “tricyclazole†agent can be used. , 7 days apart, 2–3 times.
3. Pharmacy use: (1) 20% tricyclazole: a protective fungicide with strong systemic absorption. The commonly used concentration is 1000 times liquid, and the dosage of the dosage is 50-75 grams. (2) 40% Fuji No. 1 emulsifiable concentrate or 40% wettable powder: It has preventive and therapeutic effects. It can be used for the initial onset and early prevention of spider mites. The commonly used concentration is 1000 times liquid, and the dosage of acre is 60-75 ml (g).
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