武陵山区地处湘、鄂、渝、黔四省、市交界之处 ,境内山峦起伏 ,海拔起伏较大 ,长期低温、阴雨、高湿、寡照 ,是全国稻瘟病重发区。常年稻瘟病发病面积在三分之一以上 ,一般用药 3～ 4次 ,有时用上 10余次尚不能保收。选育、鉴定和推广抗病、丰产、优质杂交稻是降低生产成本 ,实 Wuling Mountain is located in Hunan, Hubei, Chongqing and Guizhou provinces, at the junction of the city, the territory of ups and downs, ups and downs larger, long-term low temperature, rain, high humidity, the number of photos, is the national blast disease reclamation area. Perennial blast disease in more than one-third of the area, the general drug 3 to 4 times, and sometimes spend more than 10 times can not be received. Breeding, identification and promotion of disease resistance, high yield, high quality hybrid rice is to reduce production costs, in fact