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穗颈瘟是危害水稻的主要病害之一。近几年来在我市几县均有不同程度的发生与危害,一般减产5％～15％,严重的达15％以上。 一、发生特点 引起稻瘟病大发生是综合因子影响的结果。除水稻品种本身的抗病能力有关外,还与气候条件、肥料运筹、栽培方式、水浆管理等因素有直接关系。 1、气候最适宜于病菌孢子形成和侵入的气温是24～28℃,相对湿度在92％以上。两条件同时存在就易发病。早稻在孕穗、抽穗阶段如
Panicle blast is one of the major diseases that endanger rice. In recent years in several counties in our city have varying degrees of occurrence and harm, generally cut 5% to 15%, a serious 15%. First, the occurrence of the characteristics of the occurrence of rice blast is the result of a combination of factors. In addition to the disease resistance of rice varieties themselves, but also with the climatic conditions, fertilizer management, cultivation methods, water slurry management and other factors are directly related. 1, the climate is most suitable for the bacteria spore formation and invasion temperature is 24 ~ 28 ℃, relative humidity above 92%. Two conditions exist at the same time prone to disease. Early rice in booting, heading stage such as