Abstract: Some antibiosis effects of Xiu-Shui 620 to brown planthopper (BPH) Nilaparvata lugens were presented in this paper. The parameters from laboratory were estimated as trend index of population and intrinsic control rate of N. lugens. The field control effect of Xiu-Shui 620 on N.lugens are also observed. 1) In efficts of antibiosis, the area of honeydew excreted by BPH on Xiu-Shui 48 was 37.8% of the susceptible variety, Xiu-Shui 48. Body-weight of BPH of adult after a generation reared on Xiu-Shui 620 was significantly lighter than that on Xiu-Shui 48. The mean number of eggs reared on Xiu-Shui 620 was 191/♀; Xiu-Shui 48was 316.2 / ♀ and IR64 only 87.5/♀ .The survival rate of BPH reared on Xiu-Shui 620, IR64 was a 50% decrease of reared on Xiu-Shui 48. The emergence rate of BPH from instar 5 to adult reared on Xiu-Shui 620 and IR64 was apparently less than on Xiu-Shui 48. 2) The trend index of population of N. lugens. Xiu-Shui 48,I=139.6; Xiu-Shui 620, I=30.30; IR64, I=19.09. The intrinsic control rate: in this experiment, the intrinsic control rate of Xiu-Shui 620 to N. lugens was 0.7829 and IR64 was 0.8632.3) The field control rate : in this experiment, the field control rate of Xiu-Shai 620 to N. lugens was 77.23%. 4) Number of spider: in the field ,the cumulative spider-days on Xiu-Shui 620 was 86.3 / hill and Xiu-shui 48 was 88.9 / hill.

Key words: Brown planthopper, Antibiosis, Trend index, Intrinsic control rate, Field control rate, japonica variety

摘要： 测定了秀水620对褐稻虱的一些抗生性指标，从实验室所得的各种参数来估计褐稻虱的种群趋势指数和内禀控制率；同时调查了秀水620对褐稻虱的田间控制作用。(1)抗生性作用中． 秀水620品种上褐稻虱分泌蜜露的面积为感虫品种秀水48的37.8％；饲养一代后，刚羽化的成虫体重比感虫品种上的成虫体重显著减轻。秀水620品种上，成虫平均产卵量为191粒／♀；秀水48品种上为3l6.2粒／♀；IR64品种上仅87.5粒／♀；在秀水620、IR64品种上的存活率比秀水48品种上存话率减少约50％，羽化率明显比秀水48品种上低。(2)褐稻虱种群趋势指数，秀水48为139.6，秀水620为30.30，IR64为19．09；秀水620对褐稻虱的内禀控制率为0．7829，IR64为0.8632；秀水620对褐稻虱田间控制率为77.23％。

关键词: 褐稻虱, 抗生性, 趋势指数, 内禀控制率, 田间控制率