关键词: 甜菜夜蛾, 温度, 生命表

Abstract: Life tables of laboratory population of Spodoptera exigua at five different temperatures were constructed. The results showed that the developmental rate increased with the increasing temperature from 20℃ to 32℃, and the relationship between them could be simulated by the Logistic model. The developmental temperature thresholds and sum of effective temperature required for egg, larva, pupa, preoviposition stages and generation were 13.73℃, 15.68℃, 15.09℃, 12.83℃, 15.06℃, and 37.9, 126.3, 73.8, 29.2, 265.6 degree-day respectively. Both survival rate of immature stage and population trend index were the highest at 26℃. 20℃ was unfit for growth of the population. Mean egg productions at 26℃ and 29℃ were 604.7 and 611.4 respectively. 26℃ was the most suitable for adult mating with mating rate of 84.85% and 2.64 spermatophora accepted per female. Adult longevity, reoviposition and ovipositon periods declined at high temperature. Relationship between generation survival rate (S), population trend index (I) and temperature (t) could be descried by the equations: S=-0.5056 t²+27.652 t-326.02, I=-3.2532 t²+178.45 t-2270.40.

Key words: Spodoptera exigua, temperature, life table