作物损失估计是有害生物综合治理决策中确定防治收益的基础。有关水稻纹枯病产量损失的估计方法,国内外已有报道。日本羽柴辉良等报道了根据纹枯病病斑高率和田间病株率估计纹枯病减收率的回归模型;国内大多数研究只注重对各病情级别的产量损失率比较,由于分级标准和栽培品种的 Estimation of crop loss is the basis for determining the benefits of control in the integrated pest management decision. The method for estimating the yield loss of rice sheath blight has been reported both at home and abroad. Japan Yuchai Hui-Liang et al. Reported regression models for estimating the rate of sheath blight reduction based on the spot blight rates and field strain rates. Most domestic studies focused only on yield loss rates at disease-grade levels, And cultivars