杀扑磷与马拉硫磷对长尾粉蚧毒力最佳配比的筛选

Screening on the Optimum Proportion of Methidathion and Malathion for Achieving the Best Toxicity on Pseudococcus adonidum Geoffr

[目的]筛选混合药剂的最佳配比以有效控制长尾粉蚧的发生为害。[方法]采用浸虫法测定了杀扑磷与马拉硫磷混配后对防治长尾粉蚧若虫的增效作用及两种药剂混配的最佳配比。[结果]采用杀扑磷与马拉硫磷进行复配,当杀扑磷与马拉硫磷的比例为30∶70和20∶80时,两种配方的药液对长尾粉蚧2龄若虫的毒力相差不大,其共毒系数分别为347.72和356.67,均表现出明显的增效作用。从这2组配方的CTC值看,杀扑磷与马拉硫磷的比例为20∶80时配方的增效作用比30∶70配方的增效作用更为明显。[结论]该研究为杀扑磷与马拉硫磷混配防治长尾粉蚧的最佳配比提供参考。

[ Objective ] The aim was to screen the optimum proportion of mixture in order to control Pseudococcus adonidum effectively. [ Method ] The synergism of the mixture of methidathion ＋ malathion on controlling P. adonidum nymphae and the optimum proportion of the two mixed reagents were detected by using soaking method. [ Result] With 2 proportions of methidathion to malathion as 30：70 and 20：80, the mixture of methidathion ＋ malathion all had obvious synergism with the co-toxicity coefficient of 347.72 and 356.67. The toxicity of the mixture with the two formulas on II instar P, adonidum nymphae had slight difference. The CTC value of two formulas showed that the mixture of methidathion ＋ malathion with a proportion of 30：70 had obvious synergism than that with a proportion of 20：80. [ Conclusion] This paper provided reference for the optimum proportion of mixture of methidathion ＋ malathion on controlling P, adonidum.