部分药用植物对致倦库蚊的杀幼虫效果(双翅目:库蚊科)

Khondoker Md. Zulfiker Rahman, M. Razzak
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引用次数: 0

摘要

采用一种简便有效的方法,对几种药用植物的杀蚊潜能进行了评价。在实验室条件下,研究了三种药用植物Derris scandens、Rubia cordifolia和Saussurea lappa根水提物对致倦库蚊(1823)3龄幼虫的杀蚊效果。7种不同浓度(1、25、50、100、150、200和300 ppm)的水提液暴露24和48 h后,3龄幼虫的死亡率较高。其中,在250 ppm浓度下暴露24 h后,scandens根提取物的毒性最高,幼虫死亡率为100%,其次是cordifolia和slappa根提取物,幼虫死亡率分别为98.4%和87.8%。总体而言,所有植物提取物的浓度与幼虫死亡率之间存在很强的正相关关系(p小于0.001),相关系数大于0.90。接触24 h后的LC50和LC90值表明,scandens的毒性最大,LC50和LC90值最低(LC50=78.20 ppm, LC90=147.33 ppm),其次是cordifolia (LC50= 89.32 ppm, LC90=204.09 ppm)和lappa (LC50=112.29 ppm, LC90=248.72 ppm)。结果表明,所有植物水提物对致倦库蚊3龄幼虫均有较强的杀虫能力。综上所述,这些植物的水提液可有效控制致倦库蚊,可作为化学杀虫剂的潜在替代品。亚洲医学杂志。Res. 2022, 8 (4), 187-193
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Larvicidal efficacy of selected medicinal plants against the filarial vector mosquito Culex quinquefasciatus Say (Diptera: Culicidae)
The present research was conducted to assess the mosquito larvicidal potential of selected medicinal plants using an effective but simple method. Aqueous extracts of roots of three selected medicinal plants viz. Derris scandens, Rubia cordifolia and Saussurea lappa were evaluated for their mosquito larvicidal potential against the 3rd instar larvae of C. quinquefasciatus Say (1823) under laboratory settings. Aqueous extracts of these plants at seven different concentrations (1, 25, 50, 100, 150, 200 and 300 ppm) exhibited considerable mortality of the 3rd instar larvae after 24 and 48 h exposure. Among the plants, D. scandens root extract exhibited the highest toxicity inducing 100% larval mortality after 24 h exposure at 250 ppm concentration, followed by the root extracts of R. cordifolia and S. lappa inducing 98.4% and 87.8% larval mortality, respectively. Overall, extracts of all the plants exhibited a strong positive correlation between the concentration of extracts and larval mortality (p˂0.001) with a correlation coefficient of more than 0.90. The LC50 and LC90 values after 24 h contact demonstrated D. scandens as the most toxic with the lowest LC50 and LC90 values (LC50=78.20 ppm, LC90=147.33 ppm) followed by R. cordifolia (LC50= 89.32 ppm, LC90=204.09 ppm)  and S. lappa (LC50=112.29 ppm, LC90=248.72 ppm), respectively. Our results clearly indicated that all the plants' aqueous extracts showed considerable larvicidal potential against the 3rd instar larvae of C. quinquefasciatus. To conclude, the application of aqueous extracts from these plants to larval habitats may efficiently control C. quinquefasciatus mosquitoes, hence, can be recommended as a potential alternative to chemical insecticides against these vectors. Asian J. Med. Biol. Res. 2022, 8 (4), 187-193
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