香蕉假茎象甲自然种群生命表研究

通过调查研究,明确了留头蕉茎是香蕉假茎象甲（Odoiporus longicollis)重要虫源地;各季节自然条件下雌虫产卵量以春秋季较大,冬夏季较小。组建了以作用因子为组分的夏季自然种群生命表,并运用排除作用控制指数法分析了各种因子对假茎象甲自然种群的作用。结果表明,夏季假茎象甲自然种群趋势指数成长蕉株上平均为1．9974,留头蕉茎上平均为1．5237。“捕食及其他”因子对该虫种群控制作用最大,排除作用控制指数成长蕉株上为1．8443,留头蕉茎上为2．6446;“自然死亡”作用次之,“疾病”因子作用最小。“捕食及其他”是该虫种群增长的重要控制因子。

Study on the Life Table of Natural Population of the Banana Pseudostem Weevil(Odoiporus longicollis Oliver)

The results showed that the adults of banana pseudostem weevil (BPW, Odoiporus longicollis Oliver) preferred to the harvested banana pseudostem, which provided an important source of BPW growing in the banana trunks. The fecundity of the female was higher in spring and autumn than those in summer and winter. The active factor life tables of BPW natural population were constructed. The controlling effect of active factors was evaluated by using exclusion index of population control ( EIPC ). The population trend indices in growing and harvested banana trunks were 1.997 4 and 1 523 7 respectively. EIPC of the factor "predation and others"in growing and harvested banana trunks were 1.844 3 and 2.644 6 respectively. EIPC of the factor "natural death" were less and EIPC of the factor "disease"was the least. The factor "predation and others" was important.