Govindarajan M, Jebanesan A, Pushpanathan T, Samidurai K
Division of Vector Biology, Department of Zoology, Annamalai University, Annamalai Nagar, Tamil Nadu, India.
Parasitol Res. 2008 Aug;103(3):691-5. doi: 10.1007/s00436-008-1032-2. Epub 2008 Jun 5.
The leaf extract of Acalypha indica with different solvents viz, benzene, chloroform, ethyl acetate and methanol were tested for larvicidal, ovicidal activity and oviposition attractancy against Anopheles stephensi. The larval mortality was observed after 24 h exposure. The LC(50) values are 19.25, 27.76, 23.26 and 15.03 ppm, respectively. Mean percent hatchability of the ovicidal activity was observed 120 h after treatment. The percent hatchability was inversely proportional to the concentration of extract and directly proportional to the eggs. The highest effective attractancy of 90.09%, 94.20%, 85.43% and 95.75% were observed at 100 ppm concentration viz, benzene, chloroform, ethyl acetate and methanol, respectively. The lowest effective attractancy of 47.17%, 61.94%, 49.28% and 68.12% were observed at 25 ppm concentration viz, benzene, chloroform, ethyl acetate and methanol, respectively. The results that the leaf extract of A. indica is promising as larvicidal and ovicidal activity and oviposition attractancy against malaria vector A. stephensi.
对用不同溶剂（即苯、氯仿、乙酸乙酯和甲醇）提取的麻疯树叶进行了针对斯氏按蚊的杀幼虫、杀卵活性及产卵引诱力测试。暴露24小时后观察幼虫死亡率。其半数致死浓度（LC50）值分别为19.25、27.76、23.26和15.03 ppm。处理120小时后观察杀卵活性的平均孵化率百分比。孵化率百分比与提取物浓度成反比，与卵数成正比。在100 ppm浓度下，分别观察到苯、氯仿、乙酸乙酯和甲醇的最高有效引诱率为90.09%、94.20%、85.43%和95.75%。在25 ppm浓度下，分别观察到苯、氯仿、乙酸乙酯和甲醇的最低有效引诱率为47.17%、61.94%、49.28%和68.12%。结果表明，麻疯树叶提取物在针对疟疾媒介斯氏按蚊的杀幼虫、杀卵活性及产卵引诱力方面具有前景。
