白背飞虱(Sogatella furcifera)是水稻的重要害虫,自70年代中期开始,由于东南亚及我国南部稻区逐年在大面积上推广和种植抗褐稻虱而不抗白背飞虱的IR系统品种和杂优稻后,白背飞虱种群数量逐年上升,对水稻的危害日趋严重。为给制定白背飞虱合理的防治指标提供依据,1986年—1988年,作者从大田白背飞虱不同虫量的危害与水稻产量损失程 Sogatella furcifera is an important pest of rice. Since the mid-1970s, due to large-scale popularization and cultivation of brown planthopper resistant to brown planthopper in Southeast Asia and southern China on an annual basis, the IR system varieties resistant to BPH And hybrid rice, the number of white-backed planthopper population increased year by year, the damage to rice is becoming more serious. In order to provide a basis for the establishment of a reasonable control index of whitebacked planthopper, from 1986 to 1988, the author studied the harm of different insect populations of whitebacked planthopper