自农村实行生产责任制以来,广大农民为提高粮食产量,增加了对稻田的投入,主要体现在施肥量的增加和水稻种植密度的相应提高,因而导致田间郁闭性好,有利于纹枯病的发生危害,此病在我县逐年上升,近年已成为水稻生产的一大劲敌。尤其是1990年,我县遭受历史上少有的夏秋高温干旱,晚稻纹枯病仍大发生流行,危害损失严重,为历史上所罕见。据对各区,乡统计:全县晚稻种植面积37.2万亩,干旱失收9.7万亩。其中晚稻纹枯病发生 Since the implementation of the responsibility system for production in rural areas, the vast majority of peasants have increased their input to paddy fields to increase grain yields, mainly due to an increase in the amount of fertilizers and a corresponding increase in rice planting densities, leading to good canopy closure and bush blight The occurrence of this disease in our county increased year by year in recent years has become a major rival for rice production. Especially in 1990, our county suffers from the unprecedented summer and autumn high temperature and drought in history, and the occurrence of sheath blight in late rice is still prevalent. The damage is serious and rare in history. According to the district and township statistics: the county late rice planting area of ​​372000 mu, 97000 acres of drought loss. Late rice sheath blight occurred