State Key Laboratory for Biocontrol & Institute of Entomology, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
J Econ Entomol. 2010 Oct;103(5):1665-9. doi: 10.1603/ec10138.
Bioassay of nitenpyram was conducted on the planthopper Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) in the laboratory by using the rice-stem dipping method. The resulting data were analyzed using the complementary log-log time-concentration-mortality modeling technique, yielding the parameters for time and concentration effects of nitenpyram against N. lugens instars. The LC50 values to instars I and II estimated for 24, 48, and 72 h after treatment were 1.03, 0.27, and 0.11 mg/liter, respectively. These values were lower than those for instars III and IV and instars V at the same times. The estimates of LT50 for instars I and II were decreased from 69.06 to 16.22 h with the increasing concentration from 0.125 to 2 mg/liter; the same estimates for both instars III and IV and instars V at the concentrations of 1-2 mg/liter were close to each other, ranging from 33.11 to 44.16 h, much higher than the values of instars I and II at the same concentration. Based on the time-concentration-mortality relationships fitted and the virulence indices (LC50 and LT50) estimated, nitenpyram is a promising pesticide for N. lugens control.
采用稻茎浸渍法，在实验室中对褐飞虱 Nilaparvata lugens (Stål)（半翅目：飞虱科）进行了 nitenpyram 的生物测定。使用互补对数-对数时间-浓度-死亡率建模技术分析了所得数据，得出了 nitenpyram 对褐飞虱各龄期的时间和浓度效应参数。处理后 24、48 和 72 h 估计的 I 龄和 II 龄的 LC50 值分别为 1.03、0.27 和 0.11 mg/L。这些值低于同一时间的 III 龄和 IV 龄及 V 龄的值。I 龄和 II 龄的 LT50 估计值从 69.06 小时降至 16.22 小时，而浓度从 0.125 毫克/升至 2 毫克/升；同一浓度下的 III 龄和 IV 龄及 V 龄的相同估计值彼此接近，范围在 33.11 至 44.16 小时之间，远高于同一浓度下 I 龄和 II 龄的值。基于拟合的时间-浓度-死亡率关系和毒力指数（LC50 和 LT50）估计，nitenpyram 是一种有前途的褐飞虱防治农药。
