Ovicidal and repellent activities of botanical extracts against Culex quinquefasciatus,Aedes aegypti and Anopheles stephensi (Diptera: Culicidae) |
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Authors: | M Govindarajan T Mathivanan K Elumalai K Krishnappa A Anandan |
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Affiliation: | 1.Division of Vector Biology and Phytochemistry, Department of Zoology, Annamalai University, Annamalainagar-608 002, Tamil Nadu, India;2.Unit of Entomotoxicity, Department of Zoology, Government Thirumagal Mills College, Vellore-632 607, Tamilnadu, India |
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Abstract: | ObjectiveTo 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).MethodsThe 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/cm2 under the laboratory conditions.ResultsThe 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/cm2 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.ConclusionsFrom 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. |
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Keywords: | Ervatamia coronaria Caesalpinia pulcherrima Ovicidal activity Repellent activity Culex quinquefasciatus Aedes aegypti Anopheles stephensi Mosquito Leaf extract Mortality |
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