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为明确五（２）代白背飞虱对粳稻的为害损失，确定合理的防治指标， 作者于１９９６～１９９７ 年在中、晚粳水稻品种武育粳 ３ 号和 Ｓｏ１５ 上，通过接虫笼罩法结合小区、大田试验，研究不同虫量对水稻产量的影响以及五（２）代白背飞虱的增殖规律、为害损失和防治指标⒚结果表明，中、晚粳稻不同生育期，不同虫口密度的白背飞虱的增长速度不一样⒚同一生育期，低密度的增殖速度要大于高密度，但总虫量高密度处理显著高于低密度区⒚五（２）代白背飞虱百丛虫量与水稻产量损失呈极显著正相关⒚因此，当五（２）代白背飞虱早发或中等以上发生时，必须用药防治⒚控制其危害，防治指标为 １８０～２５０ 头⒚
In order to clarify the harm loss of five (2) generations of whitebacked planthopper, Sogatella furcifera, against japonica rice, and to determine the reasonable control index, the author studied the mid-late japonica rice varieties Wuyujing 3 and So15 from 1996 to 1997, Combining plot and field experiments, the effects of different insect populations on rice yield, five (2) generations of whitebacked planthopper, the damage and the control index were studied. The results showed that the growth of middle and late japonica rice at different growth stages, The rate of growth of whitebacked planthopper is different from that of other whiteflies. During the same growth period, the growth rate of low density is higher than that of high density, but the total amount of insect is higher than that of low density. (5) Therefore, when five (2) generations of white -backed planthopper occur earlier or above medium, it is necessary to control the damage by controlling the disease with control index of 180 ~ 250