采用定点监测、分级调查法对红河流域不同区域的木薯细菌性枯萎病发生情况进行研究。结果表明:(1)木薯细菌性枯萎病在红河流域进入雨季后(5月)开始发病,整个雨季中(5~9月)病害发生较为严重,尤其是进入夏季后温度满足病原菌的发病条件时,病情指数变化曲线和降雨量曲线出现了同升、同降的现象。(2)同一海拔高度下,病情指数呈现出下游大于上游和中游,而危害率则出现相反的趋势,250~300 m海拔观测点的病情指数大小顺序为下游(2.03)>中游(1.96)>上游(1.77),危害率为下游(64.57%)<中游(66.86%)<上游(70.00%);450~500 m海拔观测点的病情指数大小顺序为下游(2.01)>中游(1.77)>上游(1.76),危害率为下游(64.57%)<中游(66.29%)<上游(69.14%)。(3)同一区域则表现出低海拔地区的病情指数和危害率均高于高海拔地区。 The occurrence of bacterial wilt disease of cassava in different areas of Honghe River Basin was studied by using fixed point monitoring and grading survey. The results showed as follows: (1) Bacterial wilt disease of cassava began to enter the rains in the Honghe River Basin (May) and occurred more frequently during the rainy season (May-September), especially when the temperature reached the onset of pathogens in summer , The curve of disease index and the curve of rainfall appeared the same ascending and descending phenomenon. (2) At the same altitude, the disease index showed the downstream is greater than the upstream and middle reaches, while the hazard rate showed the opposite trend. The order of disease index at the altitude of 250 ~ 300 m was 2.03> 1.96> (1.77), the hazard rate was downstream (64.57%) middle (1.76), the hazard rate was downstream (64.57%)