The southern rice black-streaked dwarf disease is called “Hegong†in the western part of Guangdong Province. According to field investigations, the disease is currently more common, and the incidence rate of the heavier rice area is 2.3~5.8%. The block is up to 10% or more.
Southern rice black strip dwarf disease prevention and treatment method
I. Selection of resistant varieties
Replanting of southern rice black-striped dwarf disease in the previous year should be avoided.
2. Cultivate disease-free seedlings.
Putian is far away from diseased fields, advocates concentrated continuation of locust breeding, unified prevention and control of rice planthoppers, and promotes insect-proof nets to cover seedlings. During the nursery period, it covers 20-inch insect-proof nets to prevent rice locusts from moving to seedlings to spread poison.
3. Seed treatment.
Seed dressing with 10% imidacloprid wettable powder 15-20 g / kg, mix and mix.
Strengthen field management.
Increase the application of phosphorus, potassium and zinc fertilizers to improve the resistance of rice. Nitrogen fertilizer should not be applied to prevent the seedlings from being green, and the rice planthoppers are seriously affected.
Five. Treatment of disease prevention:
1. In the seedling stage, the treatment is anti-dwarf. In the field of medicinal seed dressing, the “gathering medicine†is applied once a week before the transplanting of the seedlings; the stalks that have not been treated with the seed dressing are sprayed once before the three leaves and the transplanting of the seedlings, and the weeds near the shovel must be applied at the same time. medicine. The agent may be selected from the group consisting of thiamethoxam, pymetrozine or buprofezin. The agent can be selected from 25% pymetrozine wet powder 16-20 g/mu, or 25% buprofezin wet powder 50 g/mu to spray evenly on water 45 kg.
2. Grasp the prevention and control of Honda, and pass the poison again. For medium and late rice, each drug is administered once every 3-7 days after transplanting and 15-20 days after planting. The drug may be selected from the group consisting of pymetrozine, thiamethoxam (Aketai), and buprofezin. When the number of insects is large, appropriate quick-acting drugs such as dichlorvos and chlorpyrifos may be added. It is necessary to use the amount of the foot and the amount of liquid to ensure the control effect. Alternate medication should delay the development of drug resistance. When applying the medicine, we should pay attention to the application of weeds around Putian to reduce the return of the flying scorpion.
6. Remove the diseased plants in time:
For the diseased sputum, it is necessary to eliminate the disease, increase the number when transplanting, and ensure the basic number of seedlings; strengthen the inspection during the tillering period, remove the diseased plants in time, step on the mud in the ground, and then replant the seedlings from the health plexus, while strengthening the fertilizer Management, promote early, and ensure effective number of points. Heavy disease fields should be ploughed and replanted in time.
At present, the prevention and treatment of "Hegong", that is, the southern rice black-streaked dwarf disease formula: can be used to kill rice (to control rice planthopper) 20 grams, add bacteria (an anti-viral disease) 20 grams, flushing 30 ~ 40 pounds Spray.
Please note that the key to preventing and controlling southern rice black-streaked dwarf disease is prevention. The earlier the prevention, the better the effect and the smaller the loss. Specifically, the prevention and control strategies of “controlling insects and preventing diseases, treating the fields of Datian, and protecting the fields before the treatment†are adopted. I hope that the above contents will help everyone, and hope that the farmers can refer to it!
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