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为了解二代白背飞虱对粳稻的为害损失，确定合理的防治指标，作者在武育粳３号上，通过接不同的虫量，然后一直保持自然状态的办法，研究了二代白背飞虱的增殖规律和为害损失及其防治指标。结果表明，不同水稻生育期，不同虫口密度的白背飞虱的增长速度不一样；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。二代白背飞虱百丛虫量与水稻产量损失呈极显著正相关（ｒ＝０．９４４４＊＊），关系式为Ｙ＝－１３．８７５＋７．４５１ｌｇ（ｘ）（ｘ为７月１９日白背飞虱百丛虫量），防治指标为百丛１８０～２００头。因此，当二代白背飞虱早发生或中等发生程度时，必须用药防治，控制其为害。
In order to understand the harm loss caused by the second generation of Sogatella furcifera on japonica rice and determine the reasonable control index, the author studied the second generation of white back by taking different insect quantity and keeping the natural state all the time on Wuyujing 3, Planthopper proliferation and loss of damage and its control indicators. The results showed that the growth rate of whitebacked planthopper (Sogatella furcifera) at different rice growth stages was different at different growth stages. In the same growth stage, the growth rate of low density was higher than that of high density, but the total amount of high density was higher than that of low density. There was a significant positive correlation (r = 0.9444 **) between the second generation of WBPH and the yield of rice, the relation was Y = -13.875 + 7.451lg (x) (x is July 19 Whitebacked planthopper amount) control index of 100 to 180 Cong. Therefore, when the second generation of Siberian Habit Siberian Spermophilus occurs early or moderately, it is necessary to control and control the damage by using the drug.