水稻白叶枯病自1974年在我县首次发生以来,分布范围逐年扩大,发生面积七千亩左右,约占水稻总面积的十分之一。严重度也在增加,一般发病率10～20％,严重者达80％,甚至100％。田间病叶严重度分级多为2级以上的病叶。从1975年以来,估计发病田每年因白叶枯病损失稻谷产量的10～50％。当前,水稻白叶枯病已成为我县水稻 Since the first occurrence of rice bacterial leaf blight in our county in 1974, the distribution range of rice bacterial blight has been expanding year by year, with an area of ​​about 7,000 hectares, accounting for about one tenth of the total area of ​​rice. Severity is also increasing, the general incidence of 10 to 20%, in severe cases up to 80%, or even 100%. Field disease severity grading more than two disease leaves. Since 1975, it is estimated that paddy blight causes 10 to 50% of rice production in the affected areas each year. At present, rice bacterial blight has become my county rice