基于生命表技术的胭脂虫适生性研究

运用生命表技术,结合采样测定,对胭脂虫在干热河谷区、南亚热带区及中亚热带区的代表点上的生长情况进行了研究。结果表明：南亚热带地区胭脂虫雌成虫虫体较大,怀卵量较多,质量较大,种群趋势指数最大,为最适生区域;中亚热带区域胭脂虫最大,怀卵量最多,质量最大,但种群趋势指数小,世代历期长,年世代数少,为次适生区域;干热河谷区培育的胭脂虫雌成虫虫体小,怀卵量少,质量小,种群趋势指数较小,为适生区域;在各气候条件下,影响胭脂虫种群数量变动的主导因素为卵的孵化率及1龄若虫或2龄若虫期的强降雨。各试验点均未发现大量胭脂虫天敌。

Exploration of Adaptability of Cochineal(Dactylopius confusus) Based on Life Tables

The growth of the cochineal insect (Dactylopius confusus) in hot-dry valley, southern subtropical zone and mid subtropical zone was studied by using life tables and sample testing. The results showed that the cochineal insects growing in the southern subtropical zone were bigger, the eggs and weight of female adults were also intermediate among the three zones, and the population trend index was the biggest.The mid subtropical zone was also a good place for culturing the cochineal,though the insect culturing in this zone was the biggest and heaviest among the three zones, the life cycle was more longer and there were less generations per year. The cochineal could grow in hot-dry tropical zone, but the female adult was very small and light, so the tropical zone was not the ideal place for culturing the cochineal.In every climate zone,the key factors that affected the number of the cochineal population were eggs unhatched and strong rain during the 1~(st) and 2~(nd) instar. Mass natural enemies were not found in all experimental places.