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本文应用生命表及Morris—Watt数学模型方法,分析了荒漠草原牧草害虫——白茨粗角萤叶甲的天敌控制力。根据1986～1989年第一代自然种群平均生命表组分值分析,如果排除天敌因子,害虫种群数量发展趋势指数将比原来增长10.39倍,或者说该叶甲第二代将比第一代种群数量增长97.12倍,天敌因子的控制力是非天敌因子的2.77倍。据4年的气象资料分析,恶劣气候条件主要影响甲卵啮小蜂的发生,从而间接地控制着该叶甲种群数量。不同寄主植物对害虫天敌控制力无直接影响。
In this paper, the life table and Morris-Watt mathematical model method were used to analyze the control of natural enemies of the herbivore pest, According to the analysis of the average life table components of the first generation of natural population from 1986 to 1989, if the natural enemy factor is excluded, the pest population growth trend index will increase 10.39 times than the original, or the second generation of the leaf beetle than the first generation population The number of growth of 97.12 times, control natural enemy factor is 2.77 times that of non-natural enemy factor. According to the 4-year meteorological data analysis, the severe climatic conditions mainly affect the occurrence of the larvae of Ovipogon, thus indirectly controlling the population of this leafhopper. Different host plants have no direct effect on the control of pest natural enemies.