水稻白叶枯病是一种发生急激,来势猛,蔓延迅速的流行病害。自1961年推广矮种和多肥栽培以来,本病在全省各地普遍发生流行,做成不同程度的损失。如1964年早、晚两造本病均严重发生,仅珠江平原粮产区的早稻发病面积已有70万亩左右,估计损失稻谷6千万斤以上。本病的发生,与我省的气候条件、耕作制度、栽培技术和品种等综合因素有密切的关系。但做成本病普遍流行的主导因素是品种抗病性及栽培技术问题。在尚未有高产抗病的矮 Rice bacterial leaf blight is an epidemic disease that causes acute shock, fierce and rapid spread. Since 1961 the promotion of the cultivation of short and multi-fat, the disease prevalence throughout the province, made of varying degrees of loss. As early as 1964, two late in the cost of the disease are serious, only the Pearl River Plain grain areas have an area of ​​about 700000 acres of early rice, an estimated loss of more than 60000000 tons of rice. The occurrence of this disease, and the province’s climatic conditions, farming system, cultivation techniques and varieties and other comprehensive factors are closely related. But the prevalence of cost-effective disease is the leading factor in varieties of disease resistance and cultivation techniques. In the absence of high yield disease-resistant short