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在组建小菜蛾自然种群生命表的基础上，应用种群趋势指数和干扰作用控制指数，评价小菜蛾颗粒体病毒对小菜蛾种群的控制作用．试验结果表明：施用颗粒体病毒制剂后，其种群趋势指数为5．99，干扰作用控制指数为023．即，其下代数量明显下降．可见，小菜蛾颗粒体病毒对小菜蛾种群的控制作用是明显的．
Based on the natural population life table of Plutella xylostella, the control index of Plutella xylostella and Plutella xylostella population on Plutella xylostella was evaluated by using population trend index and control index of interferential effect. The results showed that the population trend index was 5.99 and the interference control index was 023. That is, the number of their next generation is significantly reduced. It can be seen that the control effect of Plutella xylostella on the diamondback moth population is obvious.