Shi Yan-Wei, Qin Xiaowa, Wang Zhongyang, Wang Meng, Liu Jie, Chen Yong, Zhang Runjie, Liu Yuedan
Department of Forensic Medicine, Zhongshan School of Medicine, SunYat-Sen University, Guangzhou 510080, China.
State Key Laboratory for Biocontrol & Institute of Entomology, SunYat-Sen University, Guangzhou 510275, China.
J Econ Entomol. 2015 Aug;108(4):2009-14. doi: 10.1093/jee/tov179. Epub 2015 Jul 2.
Paichongding is an adicyclicnitromethylene neonicotinoid insecticide with a cis-configuration. Bioassay of paichongding was conducted against Nilaparvata lugens Stål under a laboratory condition. Mortality of N. lugens was analyzed by time-concentration-mortality (TCM) regressions based on the complementary log-log (CLL) model. The conditional mortalities of test individuals increased with the exposure time after treatments with different concentrations, showing that the speed of insecticidal action is concentration dependent. Meanwhile, the conditional mortalities of N. lugens increased as the concentrations of paichongding increased for all developmental stages from instars I-II to macropterous females. Correspondingly, LC(50) and LC90 values to N. lugens gradually decreased with the developmental stages, in which instars I-II were the most sensitive to paichongding, with LC(50) values of 6.31, 0.45, 0.09, and 0.03 mg/liter for 24, 48, 72, and 96 h after treatments, respectively, while macropterous females were the least sensitive among all developmental stages, with LC(50) values of 309.03, 11.48, 1.35, and 0.19 mg/liter at 24, 48, 72, and 96 h after the treatments, respectively. The time-concentration-mortality modeling was mathematically and biologically robust to evaluate the effects of paichongding on N. lugens. The results suggest that paichongding would be an effective alternative pesticide for controlling N. lugens considering its potent effects.
哌虫啶是一种具有顺式构型的二环硝基亚甲基新烟碱类杀虫剂。在实验室条件下对哌虫啶进行了针对褐飞虱的生物测定。基于互补对数-对数（CLL）模型，通过时间-浓度-死亡率（TCM）回归分析褐飞虱的死亡率。在不同浓度处理后，试验个体的条件死亡率随暴露时间增加，表明杀虫作用速度与浓度有关。同时，从一龄若虫到长翅型雌虫的所有发育阶段，褐飞虱的条件死亡率均随哌虫啶浓度升高而增加。相应地，哌虫啶对褐飞虱的LC(50)和LC90值随发育阶段逐渐降低，其中一龄若虫对哌虫啶最敏感，处理后24、48、72和96小时的LC(50)值分别为6.31、0.45、0.09和0.03毫克/升，而长翅型雌虫在所有发育阶段中最不敏感，处理后24、48、72和96小时的LC(50)值分别为309.03、11.48、1.35和0.19毫克/升。时间-浓度-死亡率建模在数学和生物学上对于评估哌虫啶对褐飞虱的作用是可靠的。结果表明，考虑到其强效作用，哌虫啶将是控制褐飞虱的一种有效替代农药。
