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通过田间系统调查和室内观察，组建以作用因子组配的小菜蛾自然种群连续世代生命表．结果表明：春季小菜蛾连续两代种群趋势指数为１１.９，而秋季为２４.４，比春季高出一倍多.菜蛾啮小蜂是影响春季小菜蛾种群数量的重要因子，对连续两代小菜蛾种群的排除作用控制指数（ ＥＩＰＣ）为 ８. ２８，其次为菜蛾绒茧蜂， ＥＩＰＣ为 ４. ８５；在秋季，菜蛾绒茧蜂的作用仅次于 ４龄幼虫的捕食及其它， ＥＩＰＣ为 ３． ６７，菜蛾啮小蜂的作用较低，其 ＥＩＰＣ仅为 １.２，是秋季小菜蛾种群较春季高的主要原因
Through the field investigation and indoor observation, the natural population of Plutella xylostella, a continuous population of life table, was constructed with the combination of action factors. The results showed that the trend index of diamondback moth, Plutella xylostella, was 11.9 for two consecutive generations, while it was 24.4 in autumn, which was more than double that of spring.The results revealed that the population of Plutella xylostella was an important factor affecting the population of Plutella xylostella in spring, The control index (EIPC) of two populations of Plutella xylostella was 8.28, followed by that of the parasitoid Apanteles plutellae and EIPC 4.85. In autumn, the parasitoids of the parasitoid Apanteles plutellae were second only to those of the 4th instar larvae And others, EIPC is 3. 67, the larvae of Plutella xylostella had a lower effect and the EIPC was only 1.2, which was the main reason that the population of Plutella xylostella was higher than that of the spring in autumn