曲牙土天牛幼虫的生长发育及其与寄主植物的关系

The larval growth and development of Dorysthenes hydropicus and its relationship with host plants

为了探索化橘红主要蛀干害虫曲牙土天牛幼虫的生长发育及其与寄主植物之间的关系,提供综合治理该虫的理论依据,作者于田间利用化橘红、白木香和短萼白花灰叶豆木段,分别饲养曲牙土天牛幼虫,分析该虫的生长发育趋势,同时对幼虫的体长、体重和前胸背板宽进行了比较研究。结果显示：曲牙土天牛在化橘红规范化种植基地1~2年发生1代,以个体大而重的幼虫当年化蛹的概率较高,而个体小而轻的幼虫死亡率偏高。该虫在3种寄主植物上都能完成生活史,以化橘红木段饲养的该虫幼虫虫体大小和体重增长率显著高于其它两种植物。

To understand the larval growth and development of Dorysthenes hydropicus and its relationship with host plants and to provide basic information for integrated management of the pest,the effects of the length,weight and width of Citrus grandis,Aquilaria sinensis and Tephrosia candida on feeding the pronotum of larvae of D.hydropicus were studied.The results showed that D.hydropicus was one generation in one-two years in the C.grandis Good Agricultural Practice base.The pupation rate of large and heavy larvae and the death rate of small and light larvae were significantly high.D.hydropicus could complete their life cycle on all the three host plants.The size and weight growth rate feeding on C.grandis were significantly larger than those on A.sinensis and T.candida.