白背飞虱 Sogatella farcifera(Horva’th)是我国水稻上最重要的害虫之一。自70年代末以来,由于国外虫源的变化,我国南方水稻品种的改良,种植水平的提高,以及耕作制度的变化,白背飞虱种群骤然上升,严重发生的频次明显增加,不仅在早、中稻上是主要优势种,而且在晚稻上也造成较严重的危害。白背飞虱与褐飞虱同属刺吸性害虫,其发生规律相似,但在对水稻产量的影响方面有其不同的特点。有关产量损失和防治指标的研究,国内外均有过报道。日本秋田县研究了稻株对白背飞虱的可容忍的密度水平,认为水稻后期, Sogatella farcifera (Horva’th) is one of the most important pests on rice in China. Since the late 1970s, due to the change of foreign insect sources, the improvement of rice varieties in southern China, the improvement of planting level and the change of farming system, the population of white-backed planthoppers suddenly increased and the frequency of serious occurrence increased obviously. Middle rice is the main dominant species, but also in the late rice caused more serious harm. White-backed planthopper and brown planthopper belong to the same sucking pests, and their occurrence patterns are similar, but they have different characteristics in the impact on rice yield. Studies on yield loss and prevention and control indicators have been reported both at home and abroad. Japan Akita study of rice plant whitebacked planthopper tolerance of the density level that the late rice,