Detailed Explanation of Key Points for Rice Viral Disease Prevention and Control Technology

The occurrence of rice viral diseases is characterized by outbreaks, intermittency and migration. The severity of rice viral disease occurrence is closely related to the farming system, the population and migration patterns of transmission vectors, climatic conditions and cultivation management measures. Control should implement the plant protection policy of “prevention first, integrated control”, with emphasis on controlling insects to prevent disease, and on rational arrangement of farming systems and varieties. The main control measures are:

1. Strengthen monitoring and early warning. Strengthen monitoring and forecasting of planthoppers and leafhoppers in rice (seedling) fields and on hosts outside fields, and provide targeted guidance for prevention and control work.

2. Select disease-resistant varieties  This is the most economical and effective measure for preventing and controlling viral diseases. At the same time, pay attention to rational arrangement of varieties and avoid mixed planting of varieties with inconsistent growth periods.

3. Cut off the source of the virus  Clear weeds around fields to reduce insect sources. At the same time, carry out winter prevention well. In severely affected areas, after the late rice harvest, winter plowing and sun-drying of the field should be carried out, and ratoon rice and weeds such as Alopecurus aequalis along field edges and ditches should be cleared.

4. Carry out cultivation management well

1. In historically affected areas, appropriately adjust the rice sowing and transplanting periods within the suitable growth period, and try to stagger the period when rice is susceptible to disease from the peak occurrence period of virus-transmitting vector insects. Late rice seedling fields should be as far away as possible from early rice fields.

2. Strengthen water and fertilizer management. For affected fields, drain and sun-dry the field in time, apply quick-acting fertilizer, and increase the application of phosphorus, potassium and farmyard manure to enhance the disease and insect resistance of rice.

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

5. Control insects to prevent disease  Eliminate virus-carrying insects before they transmit the virus, especially during the early rice harvest when virus-carrying insects migrate to late rice seedling fields and early transplanted main fields.

1. Do a good job of seed chemical treatment. Mix 15-20 grams of 10% imidacloprid wettable powder per kilogram of rice seed, and sow after the liquid is fully absorbed.

2. Seedling fields should be selected far from diseased fields, and concentrated and contiguous seedling raising is advocated. Before sowing, do a good job of controlling planthoppers and leafhoppers on crops or weeds around the seedling field. Actively promote insect-proof net seedling raising, which can effectively prevent major outbreaks of rice viral diseases.

3. Where planthoppers occur lightly, pay attention to spraying seedlings with “send-off medicine”, which can prevent rice blast and planthopper virus transmission.

4. From the 2-7 leaf stage of seedlings and the early stage in main fields, continuously do a good job of controlling rice planthoppers and leafhoppers,

5. In the early stage of disease occurrence, spray antiviral preparations, which have a certain inhibitory effect on the development of rice viral diseases.