In the rice sowing to the farmland, farmers should focus on the prevention and control of seed-borne diseases (crackling disease, seedling rice blast, dry-point nematode disease, etc.), Laodelphax striatellus, and first-generation locusts. In the rice breach period, we must focus on the control of pests such as rice planthopper, rice leaf roller, aphids, ear mites and rice false smut. In the rice panicle stage, rice planthopper is the main target, and other diseases and insect pests are treated. First, the prevention and control of rice planthoppers. Farmers should increase the application of organic fertilizers, implement soil testing and formula fertilization, implement shallow water irrigation, and properly bake the fields. One season of rice does not need or use less chemical pesticides before the beginning of July, creating favorable conditions for the breeding of natural enemies in rice fields. When the tillering period, there are 1000 nymphs of nymphs (more than 60% of brown planthoppers) - 1500 heads (more than 60% of whitebacked locusts), 1500 nymphs of young nymphs at the booting stage (big belly stage) to the heading stage (brown locusts) More than 60%) - 2000 heads (more than 60% of whitebacked locusts); after 2000 headings, when 2,000 nymphs of young nymphs are used, farmers can choose pyridoxone, buprofezin, ethiprole, chlorpyrifos, dichlorvos, etc. Prevention and treatment. For the field with complex insects, it is advisable to choose two kinds of matching agents. In the medication, the amount of foot medicine should be used, the amount of water should be sufficient (60 kg per mu), the spraying position (middle and lower parts of rice plants), and the water layer (water layer of about 3 cm for 5 days) should be used. Or fumigate with dichlorvos. Second, the prevention and control of rice leaf roller. Farmers should promote early growth in the early stage of rice growth, moderately bake the fields in the medium term, and control the use of nitrogen fertilizer in the later period. In the year of occurrence, the control period is the peak period of egg hatching, and the treatment is repeated once after 7 days; in the middle occurrence year, the control period is the peak period of young larvae. Four (2) generation of rice leaf roller can be controlled by Bt, avermectin and other agents (when biopesticide Bt is selected, the control period should be controlled at the peak of egg hatching); five (3) generation and six (4) For the prevention and treatment, avermectin, profenofos, chlorantraniliprole, carbaryl salt and chlorpyrifos may be used. Third, rice locust control. Winter leisure fields timely plowing and deepening the water for more than one week, appropriately delaying the sowing date of rice, avoiding and alleviating the damage of the main damage generation. Rational use of drugs, demonstration of sexual attractants, insecticidal lamps, to reduce the amount of chemical pesticides. The first generation of the rice stem borer is protected by the early rice field and the first season rice paddy field. Bt and its compounding agent are used at the peak of egg hatching or insecticide control at the peak of the first and second instar larvae. The control period is at the peak of egg hatching, and the recurrence area is re-treated once every 7 days to 10 days. The agent is selected from the group consisting of a vitamin salt, chlorpyrifos, fipronil, and avermectin. Hey, the second generation is picking up the heart. When the density of mu egg mass reaches 120 or more, the medicine is used for prevention and control at the peak of egg hatching, and the avermectin compound and insecticide list are used for the medicine; the white ear is treated for three generations, and the rice break period in one season (when 5) -10% rice smashed when the ear is smear), the drug is selected with triazophos and insecticide or avermectin compounding agent. Farmers should pay special attention to the fact that different types of pesticides should be alternately used during the prevention and control process to delay the development of drug resistance. Try to keep the shallow water layer in the field when applying the medicine. Fourth, rice blast disease prevention and control. Rice varieties should be replaced in time after planting for 4-5 years. Before planting rice, farmers can soak seeds with 25% prochloraz or 5.5% dithiocyanomethane 2500-3000 times. Farmers should pay attention to the rational application of NPK and promote the application of foliar fertilizer. Shallow water irrigation, timely and moderate baking. In the prevention and control of nursery and leafhoppers, it was found that the central diseased plants were treated or treated for 1-2 times when the rate of diseased or diseased leaves reached 3-5%. To control the ear mites, the susceptible wards in the old ward should be strictly prevented from spraying 3-5 days before the rupture, and then re-treat after one week. The agent can use 40% rice blast, 75% tricyclazole, Bacillus subtilis, spring thunder. Mycin and the like. Fifth, rice stripe disease prevention and control. According to the performance characteristics of alfalfa and japonica rice in japonica rice, the provincial plant protection station recommended that the disease be more serious in the rice area, such as compression of alfalfa and japonica rice, expansion of japonica rice or promotion of cultivation of salt rice No. 8, Xudao No. 3, Yanjing No. 9, and japonica 119. Fengliangyou 1 and Fengliangyou 4 are rice varieties with good disease resistance. In the critically ill areas, it is recommended to use insect-proof nets or non-woven fabrics for breeding. In the first season, rice is appropriately postponed, and live broadcast is advocated to avoid the peak of migration and transmission of the adult larvae. In the seriously ill area, the ripening period of wheat is harvested in Putian, and the medicinal preparations are pymetrozine or chlorpyrifos, zhongdingwei, etc., and the insects are treated in time. The disease-prone areas are inoculated to the second and third generations of the larvae of the larvae to the control of the young nymphs. The syrups are pymetrozine or chlorpyrifos and zhongdingwei. 6. Prevention and treatment of rice smut. Farmers can choose the resistant varieties such as Xieyou series, Dyou 527 and Xiushui 664. The first application is applied 10 days before the rice break, and the treatment is repeated once in the break period. The drug may be selected from tebuconazole, well wax, and carbazole. Seven, rice sheath blight pesticide control. When the farmer fills the field, he salvage the “slag†blown by the wind to the edge of the field, and bring out the concentrated treatment outside the field to reduce the initial bacterial source of rice sheath blight. Rational application of nitrogen, phosphorus and potassium should be carried out to properly bake the fields. In the early rice at the booting stage, the disease plexus rate is 20%, the heading disease rate is 40%, and the middle and late rice tillers are at the jointing stage. The disease rate is 20%. % silfuramide suspension (full spike), 20% Jinggangmycin wettable powder, 5% Jinggangmycin aqueous solution, 12.5% ​​well waxing agent, etc., the liquid should be sprayed evenly in the middle and lower parts of the rice plant. The seriously ill field will be re-treated 7-10 days after the first application. plastic faucet connector,plastic faucet parts,hard plastic faucet cover,kitchen faucet quick connect adapter,Faucet Hose Adapters Yuyao Gaobao Sanitary Ware Factory , https://www.gurberry.com
Which three critical periods should be seized in rice treatment and pest control?