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    草地贪夜蛾对不同品种甘蔗及筒轴茅的取食选择及生长适应性

    Feeding preference and growth adaptability of Spodoptera frugiperda on different sugarcane varieties and Rottboellia cochinchinensis

      摘要
    • 摘要:
      目的  明确草地贪夜蛾Spodoptera frugiperda对甘蔗和筒轴茅的取食偏好及生长适应性。
      方法  通过取食选择性试验和构建试验种群生命表，以2个糖蔗品种(‘桂糖42号’和‘台糖22号’)、2个果蔗品种(‘桂果蔗1号’和‘黄皮果蔗’)及蔗田常见杂草筒轴茅作为研究对象，研究草地贪夜蛾对不同品种甘蔗及筒轴茅的取食选择及生长适应性。
      结果  草地贪夜蛾各龄幼虫在糖蔗和果蔗间更趋向取食果蔗，其中在‘桂果蔗1号’上的取食选择率大多显著高于其他供试品种；在‘桂果蔗1号’和筒轴茅上选择取食时，对筒轴茅有显著的趋向性。草地贪夜蛾幼虫期存活率在筒轴茅上最高，为66%；其次为‘桂果蔗1号’，存活率为12%；在其余品种甘蔗上，低龄幼虫时就已全部死亡。草地贪夜蛾在筒轴茅上能够完成生活史，试验种群内禀增长率(rm)和周限增长率(λ)分别为1.16和1.52。
      结论  相对于甘蔗，草地贪夜蛾更嗜好取食筒轴茅，并且对筒轴茅有更强的适应性。

       

      Abstract:
      Objective  To clarify the feeding preference and growth adaptability of Spodoptera frugiperda on sugarcane and Rottboellia cochinchinensis.
      Method  Two sugarcane varieties (‘Guitang 42’ and ‘Taitang 22’) , two fruit cane varieties (‘Guiguozhe 1’ and ‘Yellow skin sugarcane’) , and a common weed of R. cochinchinensis in sugarcane field were selected as the research objects. Through the feeding preference experiment and constructing the life table of the experimental population, the feeding preference and growth adaptability of S. frugiperda on sugarcane and R. cochinchinensis were studied.
      Result  The larvae of different instars of S. frugiperda preferred to feed on fruit sugarcane when choosing between sugarcane and fruit sugarcane, and the feeding selection rate on ‘Guiguozhe 1’ was most significantly higher than those of other tested varieties. The larvae of S. frugiperda had a significant feeding tendency to R. cochinchinensis when choosing between ‘Guiguozhe 1’ and R. cochinchinensi. The larval survival rate of S. frugiperda on R. cochinchinensiswas the highest, which was 66%, followed by 12% on ‘Guiguozhe 1’. On other sugarcane varieties, S. frugiperda had died in the period of low instar. The life cycle of S. frugiperda could be completed on R. cochinchinensis, and the intrinsic rate of increase (rm) and finite rate of increase (λ) were 1.16 and 1.52, respectively.
      Conclusion  Compared with sugarcane, S. frugiperda preferes to feed on R. cochinchinensis and has higher adaptability.

       

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