Abstract:In order to study the toxicological mechanism of tebufenzide, we raised poisonous diet to the larvae and adults of Wuhan susceptible strain of Spodoptera exigua. The results showed that tebufenozide was an insecticide with long aftereffect, whose effects included lower pupation and emergence rates, fewer oviposition numbers of female, higher unhealthy pupa and adult rates. Compared with the CK, the population trend index of the second generation dropped by 10.92% and 26.71% respectively after larvae were treated with 0.2 and 0.4 mg/kg poisonous diet, while the third generation reduced by 12.16% and 14.24% respectively. It indicated that such effects could last to the third generation at least and it was more obvious with higher dose. But there was no significant difference in the egg hatchability and pupa weight. The experiments of feeding adults on poisonous diet showed that the population trend index of the second generation dropped by 14.18% and 12.96% respectively, while the third generation decreased by 34.40% and 39.24% respectively. The effect on adult had positive relation to the times of using tebufenozide. The influence on adult longevity had negative relation to the selective frequency and pressure of tebufenozide, and the effect on male adult was more obvious than female.