20%高渗毒死蜱乳油防治棉花棉铃虫田间药效试验初报

20%高渗毒死蜱乳油在二代棉铃虫发生盛期防治，每公顷施用有效成分270g时药后1、3和7d的矫正防效分别达83.99%、89.08%和89.73%，速效性和持久性均显著优于12%路路通乳油每公顷施用量1800ml效果（67.63%、74.61%、76.54%）。从保顶效果看，20%高渗毒死蜱乳油每公顷施用有效成分270g时为89.30%，显著优于对照12%路路通乳油1800ml每公顷施用效果80.70%。

The Preliminary Report of the Effects of 20% Chlorpyrifos EC on Prevention and Control of Cotton Bollworms in the Field

In the second generation of Heliothis armigera Hubner season,20% chlorpyrifos EC that can easily seep into the body of the insects is of great effect.The experiment shows that the correct effects of the prevention and control reach respectively 83.99%,89.08% and 89.73%,when 18g effective composition of it is employed in 667 m2 field in 1 day,3 days and 7 days, and compared with 120ml 12% lulutong EC employed on 667m2 field, its effect is more quick and lasting. In terms of protecting the top of the stem, when 18g effective composition of 20% chlorpyrifos EC is employed in 667 m2 field, the effect is 89.30, which is remarkably better than that of 120 ml 12% lulutong EC employed in 667m2 field.