1987～1989年在我州中部七县市(个旧、开远、建水、弥勒、蒙自、石屏、屏边)的调查结果,水稻纹枯病发病面积已占稻田面积的20％～50％。1990年对七县市15个乡镇的调查,发病田块占调查田块的78％;1991年上升至90％～100％,发病面积逐年扩 From 1987 to 1989, in seven counties and cities in Central China (Gejiu, Kaiyuan, Jianshui, Maitreya, Mengzi, Shekping, Pingbian), the incidence of rice sheath blight accounted for 20% ~ 50 %. In 1990, surveys were conducted on 15 townships in seven counties and cities. The number of field plots accounted for 78% of the total number of plots surveyed. In 1991, the number of field plots increased from 90% to 100%