Control Techniques of Black-streaked Dwarf Disease in Single-season Late Rice

Rice black-streaked dwarf disease has been relatively light in recent years since its occurrence in the rice-wheat planting area and has not received sufficient attention. However, due to the influence of warm winter weather last year, the mortality rate of ash-grass that were overwintering in wheat fields and weeds was low, and the amount of residual insects in the fields was high. After a period of reproduction from mid-March to early-May, the number of fields was large. Increased, the number of empty rice fields per mu is more than 100,000. At present, rice black-streaked dwarf disease strains have been found in Waseda, indicating that the city has already possessed a source of rice black-streaked dwarfing. With the harvest of large wheat and the weeds of the host plant, A. sibiricus matures, and the ash-hopper adult It has begun to migrate to early rice fields, single-season late rice fields, direct field spawning hazards, and at the same time spread rice black streak dwarf virus. According to a survey conducted by the Zhejiang Provincial Bureau of Plant Protection and Quarantine, the incidence of gray rice blast is generally higher in the province, and local areas have approached or exceeded 12% of the pandemic index. To this end, all localities must fully understand the danger of rice black-streaked dwarf disease. Currently, prevention and control of ash-grasses in Putian and Honda are mainly done.

1. Comprehensively carry out soaking and seed dressing of pesticides. Combined with the prevention and control of rice plant diseases, 35% rice, 80% Ruijinte and 25% imidacloprid were used to soak seeds and seed dressings, and the internal absorption of the seedlings was used to control the early L. falciparum transmission.

2, ç‹  governance Putian a generation of gray rice and earthworm adults. Select fipronil (1 g for 80% fipronil), 25% for imidacloprid (for Bordet, first net), etc. with good persistence, and chlorpyrifos (48% for Xinyijia, 40% for attack) with better fast-acting properties. Isoprocarb, mixed aldicarb, dichlorvos, etc. are used in combination. 2-3 days before transplanting, use well to send the herbs, so that it can be transplanted with drugs.

3. Appropriate prevention and treatment of Honda rice husks in the early days of Honda. The control of ash and rice blast in direct-seeded paddy fields was applied 7-10 days after sowing (Sui Miao Lu Qing). Transplanting rice Honda is usually treated for about 10 days after transplanting, combined with the control of rice leaf roller and leaf borer, and treated again for about 10 days. After July, due to high temperatures, the number of ash and rice pods It will be reduced, and the ability to reduce the taint capacity of ash rice bran will not need to be specifically controlled. In the common area of ​​rice black streaked dwarf disease. In the treatment of diseases and diseases, the use of bacteriocin and other viral inactivators to prevent 1-2 times, can increase the plant's anti-virus ability, reduce the risk of disease. Attention should be paid to alternate medication, which can delay the development of resistance to ash and rice blast, and pay attention to the safe use of pesticides such as chlorpyrifos and dichlorvos.

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