采用浸债法测定了阿维菌素对棉铃虫卵孵化抑制作用，0．1，1，10，I10μg·mL－1阿维菌素对卵孵化抑制率分别为州，51％，63％，71％。采用饲料混药法测定了阿维菌素对不同龄期棉铃虫的毒力。结果表明，处理后96h对初孵、1龄、3龄、4龄幼虫的致死中浓度LC500分别为0．005，0．021，0．64，1．13μg·mL－1，对照药剂甲基对硫磷、水胺硫磷、灭多威对3龄幼虫的致死中浓度分别为22，39，72μg·mL－1；同时还观察到1龄幼虫经处理96h后幼虫体长抑制率与药剂浓度成正相关，当药剂含量为0．00625，0．0125，0．025，0.05μg·mL－1时，体长抑制率分别为9．5％，57．1％，71．4％，90．5％；处理14d后，对照幼虫为6龄，处理组0．05μg·mL－1的为2～3龄，0．00625μg·mL－1的为3～5龄；低含量阿维菌素饲喂5龄幼虫8d后化蛹率、死蛹或畸形蛹率、蛹重对照组分别为68％，13％，0．48g·头-1，处理组分别为3％，56％，0．26g·头-1；采用点滴法和饲料混药法测定的PBO和TPP对阿维菌素的增效作用，结果表明PBO有一定的增效作用。文中还讨论了PBO增效作用的机理。 The inhibitory effect of avermectin on egg hatching of cotton bollworm was determined by the method of leaching by debt. The hatching inhibition rates of avermectin 0.1,1,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,10,1.0,110, 71%. Toxicity of abamectin to cotton bollworm (Helicoverpa armigera) of different instars was determined by feed mixture method. The results showed that the lethal LC500 of 96h after inoculation to newly hatched, 1st, 3rd and 4th instar larvae were 0.005, 0.021, 0.64 and 1.13 μg · mL -1, respectively. The control agent methyl The lethal concentrations of parathion, isocarbophos and methomyl for the third instar larvae were 22, 39 and 72μg · mL-1, respectively. At the same time, The results showed that the body length inhibition rates were respectively 9.5%, 57.1%, 71.4% and 90% when the drug content was 0.00625,0.0125,0.025,0.05μg · mL-1 .5%. After 14 days of treatment, the control larvae were 6 years old. The treatment groups were 2 to 3 years old with 0.05μg · mL-1 and the 3 ~ 5 years old with 0.00625μg · mL-1. The low content of abamectin The pupae rate, dead pupae or deformed pupal rate of the 5th instar larvae fed on the 8th day were 68%, 13% and 0.48 g · kg -1, respectively. The treatment groups were 3%, 56% and 0%, respectively. 26g · head -1. The synergistic effects of PBO and TPP on abamectin were determined by using the drip method and the feed mixture method. The results showed that PBO had a synergistic effect. The paper also discussed the mechanism of PBO synergism.