水稻白叶枯病是近年我省流行频率较高的一种病害,在一九七一至一九八○的10年中,属于中度流行至大流行的有4～5年,在大流行的一九七五年晚季,全省发病面积达35万多亩,严重度达3级以上,有的县大面积遭到歉收。属轻度发病的一九七六年,发病面积也达8万多亩,局部田块受害歉收。此病晚稻重于早稻。台风降雨频繁的年份重于一般年份,尤其在老病区,常年发病都较重。龙溪地区近年发病面积逐年扩大,已成为该区为害水稻最主要的一种病害。受害田块,轻的减产一、二成.重的三成以上.甚至颗粒无收。 Rice bacterial blight is a disease with a high prevalence in recent years in our province. Between 1971 and 1980, 4 to 5 years were moderate to severe pandemic, In the late seventy-five of 1975, the province’s disease area reached 350,000 mu, the severity of which reached above Grade 3, and some counties were badly affected in large areas. It was a mild disease in 1976 with an area of ​​more than 80,000 mu and a shortage of local plots. The late rice is heavier than the early rice. The frequent years of typhoon rainfall are heavier than normal years, especially in old ward areas, where perennial morbidity is heavier. Longxi area incidence in recent years, expanding year by year, has become the most affected area of ​​rice diseases. Damaged field plots, light cut one or two, heavier than three percent, or even crop failure.