萧氏松茎象幼虫虫道形状与注药致死率的关系

The Relationship between Tunnel Shape of Hylobitelus xiaoi Larvae and Mortality with Tunnel Injection

萧氏松茎象幼虫的死亡率与虫道形状关系较大。研究结果表明,当虫道形状为线形时,两种农药的致死率最高,对第一代幼虫可达80%,对第二代幼虫超过90%。虫道为S形时,致死率最低,对第一代只有不到40%,第二代略高,也只有60%。当虫道为T形、Y形和环形时,对第一代幼虫的致死率介于40%～60%,对第二代幼虫的致死率略高介于50%～70%。

To find out the relationship between the tunnel shape of Hylobitelus xiaoi larvae and death ratio with tunnel injection,this experiment was made with Baoluning and Imidacloprid EC against the pest.The results showed that the relationship between the mortality of pest and the tunnel shape with tunnel injection was osculation.When the tunnel shape of larvae was linear,the mortality of pest was highest.The old-age larvae was about 80% and the new larvae was above 90%.When the tunnel was S-shape,the mortality was lowest.The old-age larvae was about 40% and the new larvae was only 60%.When the tunnel was T-shape、Y-shape or round,the mortality of old-age larvae was between 40% and 60%,and the new larvae was between 50% and 70%.