Key points of Prevention and Control of Rice virus Disease

The occurrence of rice virus disease has the characteristics of outbreak, intermittent and migration. The severity of rice virus disease is closely related to farming system, occurrence quantity and migration law of transmission vector, climatic conditions and cultivation management measures. Control should implement the plant protection policy of "prevention first, comprehensive control", do a good job in pest control and disease prevention, farming system and rational distribution of varieties. The main prevention measures are:

I. Strengthen monitoring and early warning, strengthen monitoring and forecasting of rice (seedling) field and field outside host planthoppers and leafhoppers, and guide prevention and control work in a targeted manner.

2. Selection of disease-resistant varieties This is the most economical and effective measure to prevent and control virus diseases. At the same time, attention should be paid to the rational distribution of varieties to avoid mixed planting of varieties with inconsistent growth periods.

Third, cut off the source of poison to eliminate weeds around the field and reduce the source of insects. At the same time, winter prevention should be done well. After harvesting late rice in seriously ill areas, winter ploughing and sunning should be carried out to remove weeds such as ratooning rice and wheat niang at the edge of fields and ditches.

IV. Do a good job in cultivation management

1. In historical disease areas, the sowing and transplanting dates of rice should be adjusted properly during the proper growth period, the sensitive period of rice disease should be staggered from the peak period of virus vector insects as far as possible, and the late rice seedling field should be kept away from the early rice field as far as possible.

2. Strengthen the management of water and fertilizer, timely drain and dry the diseased fields, apply quick-acting fertilizer, increase phosphorus, potassium fertilizer and farm manure, and enhance the disease resistance and insect resistance of rice.

3. Strengthen field inspection and pull out diseased plants in time.

5. Control and prevent pests Eliminate poisonous insects before they spread, especially when they migrate to late rice seedling fields during early rice harvesting and early planting.

1. Seed pesticide treatment is done well. Mix 15- 20g of 10% imidacloprid wettable powder with each kilogram of rice seed, and sow after the solution is fully absorbed.

2. The seedling field should be far away from the diseased field, and centralized continuous seedling raising should be advocated. Before sowing, planthoppers and leafhoppers on crops or weeds around the seedling field should be controlled. Active promotion of insect control nets for seedling raising can effectively prevent the occurrence of rice virus diseases.

3, the occurrence of light planthopper should pay attention to spraying seedlings "send medicine", can prevent rice blast and planthopper transmission virus.

4. During seedling 2-7 leaf stage and early field stage, rice planthoppers and leafhoppers should be controlled continuously.

5. Spraying antiviral agents at the early stage of disease can inhibit the development of rice virus disease to some extent.