红棕象甲室内生物学特性及形态观察

在室内对红棕象甲Rhynchophorus ferrugineus Fab.生物学特性和形态进行系统观察。结果表明在26℃、RH80%、寄主食料华盛顿棕榈饲养条件下,红棕象甲世代历期平均114.77d,最短87.00d、最长166.00d,其中卵期平均3.50d,幼虫期平均36.68d,结茧到产卵前历期平均29.96d。幼虫以8龄为主,1~2龄幼虫的体重小于0.01g,头壳宽短于1.0mm,3龄后幼虫体重、头壳宽度、体长和体宽开始增加,8龄时幼虫平均体重为3.36g,头壳宽度6.0mm。成虫雌雄性比1.78∶1,补充营养能显著延长成虫寿命,在无补充营养时,雌雄成虫寿命只有7.00d左右,而在补充营养后,雌雄成虫寿命最长可分别达130.00d和244.00d。雌虫产卵量最大376粒,最小89粒,平均216粒。

Lab observation for biological characteristics and morphology of Rhynchophorus ferrugineus

The biological characteristics of Rhynchophorus ferrugineus Fab. fed on Washingtonia filifera Wendl was systematically observed at 26℃, 80% RH in the laboratory. The results showed that the whole generation duration was 87.00 - 166.00 days, witb the mean 114.77 days, in which the mean duration of eggs, larvae and cocoon to preoviposition was 3.50 days, 36.68 days and 29.96 days, respectively. Larvae experienced eight instars. The average body weight between 1st to 2nd instar was less than 0.01 g and the head capsule width was less than 1.0 mm. Body weight, head capsule width, body length and body width increased gradually from 3rd instar. The average body weight and the head capsule width were 3.36 g and 6.0 mm, respectively, at 8th instar. Sex ratio of female and male adults was 1.78 ： 1. Nutritional supplements could significantly prolong the longevity of adults. Longevity of male and female adults was both about 7.00 days without nutritional supplements, while longevity of male and female with supplementary nutrition could increase to 130.00 days and 244.00 days, respectively. The maximum and the minimum lifetime fecundity of females was 376 and 89 eggs, respectively, with the average 216 eggs.