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作者采用饲料混药法测定了齐墩螨素对不同龄期棉铃虫的毒力。结果表明,处理后48h和96h对初孵、1龄、3龄、4龄幼虫的致死中浓度LC_(50)分别为0.0141、0.049、0.58、1.14和0.005、0.021、0.64、1.13μg/g,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,当药剂浓度为0.00625、0.0125、0.025和0.05μg/g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0.05/μg/g的为2～3龄,0.00625μg/g的为3～5龄;对照组低浓度齐墩螨素饲喂5龄幼虫8d后化蛹率、死蛹或畸形蛹率、蛹重,分别为68％、13％、0.48g/头,处理组分别为3％、56％、0.26g/头。
The authors tested the toxicity of abamectin against cotton bollworm (Helicoverpa armigera) at different instars by using feed compound method. The results showed that LC50 of lethality of newly hatched, first instar, third instar and fourth instar larvae were 0.0141,0.049,0.58,1.14 and 0.005,0.021,0.64,1.13μg / g respectively at 48h and 96h after treatment, At the same time, it was also observed that the inhibition rate of body length of larvae was positively correlated with the drug concentration after 96 h of treatment. The body length inhibition rates were 9.5% and 57.1% when the drug concentrations were 0.00625, 0.0125, 0.025 and 0.05 μg / g respectively, 71.4% and 90.5% respectively. After the treatment for 14 days, the control larvae were 6 years old. The treatment groups were 2 to 3 years old with 0.05 / μg / g, while those with 0.00625 μg / g were 3 ~ 5 years old. The pupation rate, pupal or deformity pupation rate and pupal weight of the 5th instar larvae after 8 days were 68%, 13% and 0.48 g / head, respectively. The treatment groups were 3%, 56% and 0.26 g / head, respectively.