Abstract: 【Objective】The objective of this study is to clarify the effects of short-term exposure to high temperature on the survival and fecundity of the brown planthopper (Nilaparvata lugens Stål). The results will provide a theoretical basis for the prediction of occurrence and treatment of the population of N. lugens.【Method】Newly-eclosed N. lugens adults (within 24 h of eclosion) were used in the experiments. Five adult pairs were randomly collected and placed in a glass tube in a water bath at 25℃, and the experiments were carried out, at an increasing temperature with a change of 0.1℃?min^-1 from 25℃ to 33, 35, 37, 39, 39.5 and up until 40℃, and kept at the target temperature for 2 h. The error range was 0.02℃. After treatment, tubes were moved into the phytotron to recover for 1 h, and the survival rate of N. lugens was examined. Adults rawed in the phytotron were used as the control group. 【Result】Within the range of 33-37℃, the survival rate and fecundity of N. lugens were not significantly different from the control. Within the range of 39-40℃, the survival rate of N. lugens were decreased. After exposure to 39.5℃ for 2 h, the survival rate of male and female adults was less than 50%. After exposure to 40℃ for 2 h, the female adult survival rate dropped to 4.5%, and that of the male adults was 6.7%. All of the adults died within 24 h. After exposure to 33-39.5℃, the gradient of the male adult survival curve decreased abruptly than female. The preoviposition period was extended from 3.5-6.3 days with the increasing temperature from 33-39.5℃. The preoviposition period was 3.5 d at 25℃, 4.4 d at 35℃, 4.4 d at 39℃ (P＜0.05), and 6.3 d at 39.5℃ (P＜0.01), respectively. Furthermore, high temperature had a negative effect on the fecundity. The average fecundity decreased dramatically after exposure to high temperature for 2 h. F₁ survival to adulthood was significantly reduced when adults were exposed to 33-39.5℃. The survival rate dropped from 80.4% to 61.8%-75.5% as the temperature increased. Female adults ceased oviposition activities after the exposure to 40℃. The oviposition rhythms and the number of eggs of F₁ hatched per day also changed in these heat shock treatments, with prolonged oviposition period and delayed F₁ peak hatching time after exposure to 39.5℃.【Conclusion】The survival and reproduction of N. lugens significantly decreased after exposure to temperatures of 39-40℃. When the exposure temperature exceeds 39℃, it has the potential threats to the survival and fecundity of N. lugens.

Key words: Nilaparvata lugens, heat stress, survival, fecundity