1989年我们利用50％久效磷乳油和40％氧化乐果乳油,以清水分别配成2、3、4、5、8、10倍六个浓度。分别涂环于刺槐、泡桐、法桐、白榆、苹果等树干上,内吸防治大袋蛾幼虫。结果证明,两种农药的各种浓度都有杀虫效果。其中,久效磷4、5倍药液死亡率分别为98.0％和100％;氧化乐果3、4倍死亡率分别为96.7％和100％。 In 1989, we used 50% monocrotophos and 40% omethoate, respectively, with water to make 2,3,4,5,8,10 times the concentration of six. Respectively coated ring in the acacia, Paulownia, Fatong, elm, apple and other tree trunks, internal control large bag moth larvae. The results show that the two pesticides have insecticidal effects at various concentrations. Among them, the monocrotophos 4,5 times the liquid mortality were 98.0% and 100%, respectively, 3,4 times the omethoate mortality were 96.7% and 100%.