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江苏沿江地区水稻纹枯病重发原因在于大面积种植高感品种、夏秋季高温、高湿气候及栽培管理不当等。其防治在减少病源的前提下,提倡扩行减苗合理密植、干湿水控防病以及控氮增磷增钾的基础上,进一步优化化学防治策略,适当提前第1次药剂防治时间,提早控制纹枯病水平扩展,降低病穴率;在水稻拔节孕穗期,选用高效药剂,适当增大用药量,提高用药水平,有效控制纹枯病的垂直扩展,减轻严重度。
The reason for the recurrence of rice sheath blight in the area along the Yangtze River in Jiangsu Province lies in the large-scale cultivation of high-susceptible varieties, high temperature and high humidity in summer and autumn, improper cultivation management and the like. The prevention and treatment on the premise of reducing the source of disease, to promote the expansion and reduction of seedlings close, wet and dry water control disease prevention and control of nitrogen by the increase of potassium, based on the further optimization of chemical prevention and control strategies, the appropriate time ahead of the first drug control, early Control of sheath blight level expansion, reduce the disease point rate; in the jointing and booting stage of rice, the choice of efficient agents, appropriately increase the dosage, improve the level of medication, the effective control of sheath blight vertical expansion, reduce the severity.