寄主对褐纹甘蔗象生长发育影响研究

褐纹甘蔗象Rhabdoscelus lineaticollis(Heller)是近年入侵我国的棕榈植物重要害虫和潜在的重要甘蔗害虫.文章观察了该虫幼期发育历期、存活率及成虫寿命、性比、产卵量,测定了幼虫对3种寄主植物的取食量,组建了实验种群生命表.结果表明,该虫发育历期以取食甘蔗的较长,国王椰子和大王椰子的较短,完成1个世代所需时间分别为106.6,78.8,76.5 d;成虫寿命以取食大王椰子的最短,为90.82 d;产卵量则以取食甘蔗的最少,单雌为149粒.幼虫对甘蔗、大王椰子、国王椰子的取食量分别为2.05,1.86,1.04 g,建立了取食量和幼虫龄期间关系方程.实验种群趋势指数以大王椰子最大,为37.69,国王椰子次之,为6.21,甘蔗的最小,为3.66.因此,野外大王椰子、国王椰子上该虫种群暴发潜能较大.

Effect of host plants on the development of asiatic palm weevil Rhabdoscelus lineaticollis (Heller)

Asiatic palm weevil Rhabdoscelus lineaticollis(Heller) was a new dangerous pest invading China a few years ago.The duration and survival rate of the immature stages,longevity and fecundity of adults,ingestion of larvae and life tables of laboratory populations on Saccharum officenarum,Roystonea regia and Ravenea rivularis were studied.The results showed that the duration of one generation on the above three hosts was 106.6,76.5 and 78.8 days respectively.Longevity of adults was shortest as 90.82 days on Roystonea regia while fecundity least on Saccharum officenarum.The total ingestion of one larva on Saccharum officenarum,Roystonea regia and Ravenea rivularis were 2.05,1.86 and 1.04 g respectively.Based on the above results,3 equations were constructed to simulate the relationship between the ingestion and larva instars.The life tables of laboratory populations on three hosts were presented and population trend index on Roystonea regia was the highest,Ravenea rivularis secondary.