斜纹夜蛾自然种群生命参数的研究

秦厚国; 叶正襄; 黄水金; 丁建; 罗任华

斜纹夜蛾自然种群生命参数的研究

Study on life parameters in natural population of Spodoptera litura (Fabrieius)

摘要

摘要: 观察了斜纹夜蛾第4代和第5代自然种群各虫态存活率、性比、产卵量和种群趋势指数，应用控制指数分析法分析天敌等因子对斜纹夜蛾自然种群的控制作用结果表明，第4代和第5代斜纹夜蛾自然种群卵孵化率分别为88．34％和89．33％，蛹存活率分别为57．74％和61．48％，幼虫期存活率分别为0．78％和0．63％，成虫性比接近1：1，雌成虫产卵量平均1723粒和1477粒，种群趋势指数分别为3．145和2．31。在各类作用因子中“蜘蛛”对斜纹夜蛾种群数量控制作用最大，控制指数分别高达12．83和9．06，其次是“疾病及自然死亡”等因子。

Abstract: The survival rate，sex ratio，fecundity，index of population trend of natural population of Spodoptera litura of the 4～5th generations are studied and the control function of natural enemies on the natural population of Spodoptera litura is analyzed by means index of population control(IPC)．The results show that the hatching rates of Spodoptera litura of the 4～5th generations’egg are 88．34％ and 89．33％，and the survival rates of pupa are 57．74％ and 61．48％，and the survival rates of larva are 0．78％ and 0．63％，and the sex ratio of adults is 1：1 around，and the numbers of egg oviposition are 1723 and 1477 granules per female，and the indexes of population trend are 3．145 and 2．31，respectively．The control function of spider is the largest on the population number of Spodoptera litura，and indexes of population contro1 are 12．83 and 9．06，disease and natura1 death are secondly，IPCs are 4．54 and 6．33．

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