1992年棉铃虫的大发生,对农药的药效和施药技术提出了很高的要求。从我们试验示范和大面积应用看来,表明久敌乳油防治棉铃虫不仅有效,而且很经济,已列入1993年的推广农药品种。1 试验示范结果大丰县于7月28日防治三代棉铃虫试验。40%久敌乳油亩用60、75毫升,对照药剂为40%久效磷75毫升、90%晶体敌百虫75毫升,药后3天的防效为65.2%、59.1%、60.6%和43.9%,在卵孵高峰期防治二次的,药后7天的防效分别为65.6%、82.2%、 The occurrence of cotton bollworm in 1992 put forward high requirements on pesticide efficacy and application technology. From our pilot demonstration and large-scale application, it shows that long-acting EC is not only effective, but also economical. It has been included in the promotion of pesticide varieties in 1993. A pilot demonstration results Dafeng County on July 28 to prevent and control three generations of cotton bollworm test. 40% of long-time enemies Emulsion 60,75 ml, the control agent is 40% monocrotophos 75 ml, 90% crystal trichlorfon 75 ml three days after the drug control effect was 65.2%, 59.1%, 60.6% and 43.9 %, Prevention and treatment of the second peak in the incubation period, the anti-7 days after the drug were 65.6%, 82.2%