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First, the symptoms and harms. Rice stripe disease is commonly known as cancer on rice and SARS. The rice is most susceptible to disease from the seedling stage to the tillering stage. After the onset of the rice plant, the heart leaves are curled and soft, the old leaves are striped, far away like the heartworm pests, the rice plants are dwarfed, the shape is like sitting, the diseased plants are reduced, the disease Plants can not head or suck abnormal spikes, which has a large loss of yield. According to the multi-point survey and statistics of rice original seed field and wheat original seed field, the average disease rate is 10%-20%, 30% is heavier, and the yield loss is 4%-16%.
Second, the cause analysis
1. The amount of gray fly locusts increased. Stripe leaf blight is a viral disease caused by the transmission of Laodelphax striatellus. According to the data, due to the multi-year use of imidacloprid, Laodelphax striatellus has developed resistance to imidacloprid pesticides, and the control effect has decreased, and the amount of gray fly mites has begun to rise.
2. Rice varieties are susceptible. With the accelerated pace of industrial restructuring, the planting area of ​​high-quality japonica rice has expanded year by year, mainly including japonica rice 68, Wuyujing 5, D You 68 and so on. According to the Daejeon survey, there is a certain difference in the susceptibility between these varieties, but they are all susceptible varieties. The japonica rice varieties are mild and have disease resistance.
3. Ignore the control of the gray planthopper. Stripe leaf blight has not occurred in this county for a long time, and it has not been used as a control object. Because the stripe leaf blight was first developed in my native land, it did not attract enough attention. Because the township (town) agricultural technology station did not conduct pest and disease reporting, the understanding was vague, and the rice farmers ignored the control of the gray planthopper, and There is no timely medication control.
4. The weeds in the field are not protected. The amount of gray locusts on weeds is high. If they are not controlled simultaneously with field weeds, they can spread to harm rice and cause disease. In the mid-to-late July survey, weeds on the edge of the fields and the ditch were generally not treated. The incidence of paddy fields near these places was obviously heavier.
Third, prevention and treatment
1. Comprehensive prevention strategy: adhere to the plant protection policy of “prevention first, comprehensive preventionâ€, adopt the prevention and control strategy of “cutting off the poison source, treating the disease and preventing diseaseâ€, and control the gray planthopper and control the stripe disease.
2, prevention and control technology: (1) grasp the prevention and control of gray planthopper. Combined with the control of aphids in wheat ear, the control of Laodelphax striatellus was carried out, and the weeds at the edge of the field, the head and the ditch were removed, and the initial drug transmission medium was reduced. (2) Carry out pesticide soaking. Soaking seeds with imidacloprid (1 gram of imidacloprid active ingredient / 12.5 kg of rice), the control effect can reach more than 50%. (3) Highlight the key points to prevent and control the gray planthoppers in the seedling stage. Wheat, rapeseed harvesting period Putian Puji gray planthopper, every 667 square meters of tax special 30-40 ml, spray 30 kg of water evenly, 3-5 days before transplanting, then re-treatment 1 time. (4) Grasp the key control of field hazards. In the rice tillering stage, 30-40 ml of Ruijinte is used every 667 square meters, and 40 kg of water is evenly sprayed to prevent the field fly ash. In the rice tillering stage, the field rate of 0.5% of the field strain was 0.5% per 667 square meters, and the spray was treated with 40 ml of water to 40 kg of water. The disease was treated once a week.
(Fengtai County Plant Protection Station, Anhui Province, Sun Youwu, Cai Guangcheng 232100)
Source: Modern Agricultural Science and Technology
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Rice stripe disease is a viral disease transmitted by Laodelphax striatellus. In 2004, the pandemic in Jiangsu Province was sporadic in the past few years, and the area has expanded since last year. In 2004, we investigated the rice stripe disease in 16 townships in the county. The statistical area was 3333.3 hectares, accounting for about 10% of the rice planting area. Through investigation, the causes of the occurrence of stripe leaf blight were analyzed, and specific prevention and control measures were proposed, which hoped to help the future prevention and control work.
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