Toxicity and Field Efficacy Test of Several Insecticides against Carsidara marginalis Walker

[Objective]The paper was to study the prevention and control effect of different chemical insecticides on Carsidara marginalis Walker.[Method]The indoor toxicity and field efficacy of six insecticides against C.marginalis were determined by residual film method and field efficacy test.The toxicity and field efficacy were comparatively analyzed.[Result]The LC50 of 5%abamectin EC,24%spirotetramat EC,10%lambdacyhalothrin EC,10%nitenpyram SL,25%pymetrozine WP and 20%imidacloprid EC against C.marginalis were 3.585,12.083,15.012,18.754,23.373 and 61.161 mg/L,respectively.The field efficacies against C.marginalis at 1 d post administration were 78.04%,80.05%,69.92%,82.27%,71.72%and 76.72%,respectively.The field efficacies against C.marginalis at 10 d post administration were 92.49%,82.41%,83.80%,88.24%,94.10%and 97.01%,respectively.[Conclusion]The agents with strong quick effect and insecticides with strong systematic conductivity should be mixed together,in order to achieve quick and continuous insecticidal effects.

梧桐木虱各龄若虫蜡腺和蜡泌物超微结构观察

【目的】梧桐木虱Carsidara limbata是一种严重危害梧桐Firmiana simplex的害虫,观察并明确若虫蜡泌物及不同虫龄泌蜡腺体超微形态特征,有助于为其生长发育的相关研究提供理论依据。【方法】本研究依据梧桐木虱若虫形态特征变化划分样本虫龄,使用体视显微镜和扫描电镜(SEM)观察若虫蜡泌物及不同虫龄泌蜡腺体的超微形态结构特征。【结果】结果表明,梧桐木虱若虫泌蜡腺体主要分为两类:一类为泌蜡小孔,3-5龄若虫体壁出现此结构;另一类为规则或不规则圆形多孔蜡腺孔,该结构1龄若虫极少或无,其他虫龄均有分布。低龄若虫孔腺数目和类型较老龄少。若虫蜡泌物分为4种类型,即丝状蜡丝、空心"C"形蜡丝、弹簧状蜡丝、空心长蜡丝。此外,腹部末端有环肛孔环结构,腹部背腹面遍布微刺及各类刚毛。【结论】梧桐木虱若虫有4类蜡泌物和2类泌蜡腺体,随虫龄不同其类型和分布存在差异。本研究为裂木虱科害虫泌蜡器官的研究提供了参考依据。