Southern rice black-streaked dwarf disease is a newly occurring rice virus disease in Qinzhou in recent years. After the onset of rice, the plants were obviously dwarfed, thin, with flaky foliage, stiff and short leaves, shriveled bases of leaves, aerial roots at nodes, high node branching, waxy stalks on stems, and shortened spacing between leaves. Roots are weak, browning is not developed, no headings or only a few spikelets are extracted, or one or more rice plants in a bundle are shorter than about 1/3 of the healthy plants, and the short grains are not full, and the grains are not full. Less, light weight, and low seed setting rate can result in a 20% to 50% reduction in rice yield, severe, and even basic loss.
Southern rice black-streaked dwarf disease is transmitted by whitebacked planthoppers. The disease has a wide range, sudden and fulminant, rapid spread, hidden and other characteristics of the hazard, can be susceptible to all growth stages in rice, the early stage of disease is not easy to find, the time of discovery is the day of disaster, once the disease There is no effective agent control, the earlier the greater the loss of rice disease. Therefore, the earlier the prevention is, the better the effect will be and the smaller the loss will be. All levels must attach great importance to recognizing the potential risks of southern rice black-streaked dwarf disease in our city, effectively enhancing the responsibility for prevention and control work, resolutely overcoming the paralysis, carefully organizing, and early deployment, and making full use of southern rice. Black-streaked dwarf disease prevention and control of active warfare, and strive to minimize the damage to the damage.
On the prevention and control strategy, we must adhere to the plant protection policy of “prevention-oriented, comprehensive prevention and control†and adopt the technical measures of “killing poisoned pests, cutting off the source of poisons, treating farmland and protecting fields, and pre-institutional conservation and later period†and achieve “through pest controlâ€. The purpose of disease prevention. We must do a good job of preventing and controlling rice seedlings during the seedling stage and the early days of Daejeon.
I. Agricultural control
1. Promote centralized breeding and unify the management of pests and diseases. Putian should keep away from susceptible rice fields and cultivate disease-free and strong. Actively promote pest control network breeding, nursery coverage cover 40 mesh insect nets, can better prevent the migration of whitebacked planthoppers to the seedlings to suck and transfer poisons. Insect net also has the advantage of preventing mice and birds from damaging eating seeds, preventing high temperature and preventing heavy rain, etc. It is a good helper for farmers to sow in summer and is worthy of promotion and application.
2. When breeding resistant (resistant) varieties, care should be taken to avoid replanting the southern rice black-streaked dwarf disease in the previous year.
3. In the recurrence areas of southern China's black-streaked dwarf disease, the appropriate seeding volume shall be increased, the planting shall be reasonably close, or reserve seedlings shall be reserved in order to prepare the rice seedlings in the field during the tillering period of rice tillering to ensure the basic seedlings.
4, promote rational scientific planting patterns to reduce pests bridges. The use of scientific fertilization and other rice cultivation methods to increase the appropriate application of phosphorus, potassium, fertilizer and water management, improve plant resistance to insects.
Second, the implementation of "regulatory anti-dwarf" chemical prevention and control strategy
1, do a good grasp of Putian period to live in the early pass of drug clearance. (1) Seed treatment. Soaking with 10% imidacloprid 300-500 times; Seed dressing requires treatment when the seeds germinate. (2) Putian period should be applied twice. That is to say, the seedlings are sprayed one at a time and the second one is sprayed for 3-5 days before throwing. The weeds in the vicinity of Putian must be applied simultaneously. Pharmacy can be used 25% pymetrozine 8 grams, 15 kilograms of water spray, 30 kilograms per acre of liquid medicine. Or 10 to 10 grams of 10% imidacloprid, watered 50-60 kg plus virus A 800 times spray.
2, do a good job of Honda control. Method one: Honda guarantees twice use of the drug, 5 to 7 days after the rice is planted, and 15 to 20 days after the planting, and each drug is applied once. Mu 10% of 10% imidacloprid, watered 50-60 kg plus virus A 800 times spray, the agent is also optional 20% Ether Chloride EC 45 ml/mu, or 25% thiazine Isoprocarb Wet powder 150 g/mu, or 80% oxime pyridoxone 10 g/mu, add 2% nannanmycin 200 ml/mu, and evenly spray 45 kg of water. Method 2: Take the "pre-press control" approach, combined with the first fertilization with long-acting drug furan Dan Mushi 3-4 kg, can effectively control the locust, leafhopper and other pests, to achieve pest control and disease prevention purposes.
3, a reasonable choice of pesticides. The control of planthoppers can be used with highly effective, low toxicity, low residue pesticides such as imidacloprid, nitenpyram, thiamethoxam, buprofezin, etofenprox, pymetrozine, 30% carbofuran granules, etc. With the dosage of the foot and the amount of the liquid medicine, the spraying method should be emphasized, so that spraying and wet spraying can ensure the control effect. It is not possible to use a single pesticide for a long time, and it is necessary to alternately use drugs or compound drugs to delay drug resistance, and at the same time, pay attention to medication. Safety. In order to improve the prevention and control effect, it is best to achieve unified control and ensure effective prevention and control in large areas.
Third, do a good job of emergency remedial measures.
After discovering susceptible plants in the field, it is necessary to remove or step into the mud in a timely manner to reduce the source of poison in the fields, reduce the secondary transmission of poisons, and supplement the seedlings from the health plants. For lands that have already been affected, drainage should be done promptly in the field, and phosphorus, potash fertilizer and farmyard fertilizer should be added to prevent major losses caused by loss of control, missing treatment, or improper use of medicines. The results are not ideal for leakage prevention, unprotection, and control. Fields should be promptly supplemented.
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