摘要： 室内测定了虱螨脲对棉铃虫实验种群的生物活性及低剂量下对其生命参数的影响。拒食活性的测定结果显示,虱螨脲对棉铃虫三龄幼虫具有明显的拒食活性,在10 mg/kg浓度时,96 h后拒食率达到95.04%;虱螨脲也表现出较强的杀卵作用,在50 mg/L浓度下,棉铃虫1日龄卵死亡率达到87.59%。分别用叶片浸毒法和浸虫体法测定了对棉铃虫幼虫的胃毒活性和触杀活性,其对棉铃虫二龄幼虫的LC50分别为0.743 4,12.369 6 mg/L,胃毒活性约是触杀活性的17倍,表明虱螨脲对棉铃虫的作用方式主要为胃毒作用,兼有一定触杀作用。虱螨脲对棉铃虫生长发育和繁殖力影响的测定结果表明,虱螨脲可抑制幼虫生长,延缓发育,使幼虫历期、蛹期增长;同时降低其生育繁殖能力,使幼虫成活率、化蛹率、羽化率、产卵量和卵孵化率等有所下降,畸形蛹和畸形蛾比例明显增加。

关键词: 虱螨脲, 棉铃虫, 实验种群, 生物活性

Abstract: The bioact ivity of Lufenuron on experimental population of Helcoverpa armigera (H?bner) in the laboratory were carried out. The results showed that Lufenuron displayed good antifeedant activity on 3rd instar larvae and high ovicidal activity on 1-day eggs of Helcoverpa armigera (H?bner), the ant-i feeding rates of 10 mg/ kg and eggs mortality rates of 50 mg/ L were over 95104% and 87159%; LC50 of stomach poisoning and contact poisoning of 2nd instar larvae were 01743 4 and 121369 6 mg/ L with leaf and body dipping method 96 h after treatment, respect ively, Lufenuron showed that higher stomach act ivity was approximately 17 times of contact act ivity. The inhibition of the growth and development of cotton bollworm after treated with Lufenuron in diets were investigated. The larval and pupal period were elongated, and the rat ios of survival, pupation, emergence, oviposition numbers of female, and egg hatch ability decreased, unhealthy pupa and adult rates also increased.

Key words: Lufenuron, Helcoverpa armigera (H?bner) , Experimental population, Bioactivity

中图分类号: 

• S482.38