Govindarajan M, Mathivanan T, Elumalai K, Krishnappa K, Anandan A
Division of Vector Biology and Phytochemistry, Department of Zoology, Annamalai University, Annamalainagar-608 002, Tamil Nadu, India.
Asian Pac J Trop Biomed. 2011 Jan;1(1):43-8. doi: 10.1016/S2221-1691(11)60066-X.
To determine the ovicidal and repellent activities of methanol leaf extract of Ervatamia coronaria (E. coronaria) and Caesalpinia pulcherrima (C. pulcherrima) against Culex quinquefasciatus (Cx. quinquefasciatus), Aedes aegypti (Ae. aegypti) and Anopheles stephensi (An. stephensi).
The ovicidal activity was determined against three mosquito species at various concentrations ranging from 50-450 ppm under the laboratory conditions. The hatch rates were assessed 48 h after treatment. The repellent efficacy was determined against three mosquito species at three concentrations viz., 1.0, 2.5 and 5.0 mg/cm(2) under the laboratory conditions.
The crude extract of E. coronaria exerted zero hatchability (100% mortality) at 250, 200 and 150 ppm for Cx. quinquefasciatus, Ae. aegypti and An. stephensi, respectively. The crude extract of C. pulcherrima exerted zero hatchability (100% mortality) at 375, 300 and 225 ppm for Cx. quinquefasciatus, Ae. aegypti and An. Stephensi, respectively. The methanol extract of E. coronaria found to be more repellenct than C. pulcherrima extract. A higher concentration of 5.0 mg/cm(2) provided 100% protection up to 150, 180 and 210 min against Cx. quinquefasciatus, Ae. aegypti and An. stephensi, respectively. The results clearly showed that repellent activity was dose dependent.
From the results it can be concluded the crude extracts of E. coronaria and C. pulcherrima are an excellent potential for controlling Cx. quinquefasciatus, Ae. aegypti and An. stephensi mosquitoes.
测定黄花夹竹桃（Ervatamia coronaria）和朱缨花（Caesalpinia pulcherrima）甲醇叶提取物对致倦库蚊（Culex quinquefasciatus）、埃及伊蚊（Aedes aegypti）和斯氏按蚊（Anopheles stephensi）的杀卵和驱避活性。
在实验室条件下，测定不同浓度（50 - 450 ppm）的提取物对三种蚊虫的杀卵活性。处理48小时后评估孵化率。在实验室条件下，测定三种浓度（即1.0、2.5和5.0 mg/cm²）的提取物对三种蚊虫的驱避效果。
黄花夹竹桃粗提物在250 ppm、200 ppm和150 ppm时，对致倦库蚊、埃及伊蚊和斯氏按蚊的孵化率均为零（死亡率100%）。朱缨花粗提物在375 ppm、300 ppm和225 ppm时，对致倦库蚊、埃及伊蚊和斯氏按蚊的孵化率也均为零（死亡率100%）。黄花夹竹桃甲醇提取物的驱避效果比朱缨花提取物更好。5.0 mg/cm²的较高浓度分别对致倦库蚊、埃及伊蚊和斯氏按蚊提供了长达150分钟、180分钟和210分钟的100%防护。结果清楚地表明驱避活性呈剂量依赖性。
从结果可以得出结论，黄花夹竹桃和朱缨花的粗提物在控制致倦库蚊、埃及伊蚊和斯氏按蚊方面具有巨大潜力。
