analysis of the timeconcentrationmortality response of nilaparvata lugens hemiptera delphacidae to paichongding paichongding is an adicyclicnitromethylene neonicotinoid insecticide with a cisconfiguration bioassay of paichongding was conducted against nilaparvata lugens stl under a laboratory condition mortality of n lugens was analyzed by timeconcentrationmortality tcm regressions based on the complementary loglog 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 iii to macropterous females correspondingly lc50 and lc90 values to n lugens gradually decreased with the developmental stages in which instars iii were the most sensitive to paichongding with lc50 values of 631 045 009 and 003mgliter for 24 48 72 and 96h after treatments respectively while macropterous females were the least sensitive among all developmental stages with lc50 values of 30903 1148 135 and 019mgliter at 24 48 72 and 96h after the treatments respectively the timeconcentrationmortality 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