灰绿黄堇提取物对粘虫的生物活性研究

采用虫体浸渍法、夹毒叶碟法等方法研究了灰绿黄堇提取物对粘虫(Mythimna separate)的杀虫活性和作用方式。结果表明,灰绿黄堇不同极性溶剂粗提物对粘虫3龄幼虫的触杀作用以甲醇粗提物最强,校正死亡率为15.5%;甲醇粗提物不同极性溶剂萃取物以氯仿萃取物触杀作用最强,校正死亡率可达87.5%,其致死中质量浓度为13.07 g/L;氯仿萃取物对粘虫3龄幼虫具有很强的生长发育抑制作用和胃毒作用,生长发育抑制率和校正死亡率分别为88.66%和91.38%。

Study on the bioactivity of extracts from Corydalis adunca against Mythimna separate

The insecticidal activities of Corydalis adunca extracts against Mythimna separate were studied through immersion and sandwich methods. The results showed that the contact effect of methanol extract against the larvae was the strongest and the corrected mortality was 15.5%. Contact effect of chloroform fraction from the methanol extract against the larvae was the strongest, its corrected mortality was 87.5%, the median lethal concentration (LD50) was 13.07 g/L. The chloroform fraction had very strong development inhibition and stomach poisoning effects, development inhibition rate and corrected mortality were 88.66% and 91.38% respectively.