Sublethal effects of paichongding on Nilaparvata lugens (Homoptera: Delphacidae)

Nilaparvata lugens (Stål) is a major rice pest in Asia Paichongding is a novel neonicotinoid insecticide developed in 2008. The effects of this insecticide on life-table parameters and wing formation of N. lugens were examined in the laboratory. The results showed that paichongding could significantly reduce the fecundity of N. lugens, demonstrating further activity against this pest in addition to direct toxicity. The fecundity of N. lugens treated with LC20, LC30, LC40, and LC50 of paichongding were 87.44, 79.63, 63.31, and 52.66% of the control, respectively. The relative fitness values were 0.55, 0.41, 0.21, and 0.09, respectively, for LC20, LC30, LC40, and LC50 paichongding treatments. Sublethal concentrations of paichongding showed significant induction of macropterous offspring, which would be one kind of coping mechanism of N. lugens response to insecticide stress.