1999年 ,水稻穗瘟病在江苏沿海地区大流行 ,其发生面积之大 ,为害程度之重是近 2 0ａ来没有见过的。据东台市调查 ,1 999年水稻穗瘟病大流行的特点一是发病时间早。于 8月 3 0日在生育期较早的水稻上始见 ,9月 5日前后大面积上普遍发生 ,其见病期比水稻破口抽穗期仅晚 7ｄ左右 In 1999, the rice panicle epidemic was a pandemic in the coastal area of ​​Jiangsu Province. The area of ​​its occurrence was large and its degree of harm was never seen in the past 20 years. According to Dongtai survey, the characteristics of the pandemic of rice blast in 1999 are that the onset time is earlier. Beginning on August 30 in the earlier growing rice season, it occurred on a large area around September 5, and its duration of disease was only about 7d later than the breaching heading date