| Micheal Gabriel Paulraj | 1 Article |
Objectives
To evaluate the ovicidal and oviposition deterrent activities of five medicinal plant extracts namely <i>Aegle marmelos</i> (Linn.), <i>Limonia acidissima</i> (Linn.), <i>Sphaeranthus indicus</i> (Linn.), <i>Sphaeranthus amaranthoides</i> (burm.f), and <i>Chromolaena odorata</i> (Linn.) against <i>Culex quinquefasciatus</i> and <i>Aedes aegypti</i> mosquitoes. Three solvents, namely hexane, ethyl acetate, and methanol, were used for the preparation of extracts from each plant. Methods Four different concentrations—62.5 parts per million (ppm), 125 ppm, 250 ppm, and 500 ppm—were prepared using acetone and tested for ovicidal and oviposition deterrent activities. One-way analysis of variance (ANOVA) was used to determine the significance of the treatments and means were separated by Tukey's test of comparison. Results Among the different extracts of the five plants screened, the hexane extract of <i>L. acidissima</i> recorded the highest ovicidal activity of 79.2% and 60% at 500 ppm concentration against the eggs of <i>Cx. quinquefasciatus</i> and <i>Ae. aegypti</i>, respectively. Similarly, the same hexane extract of <i>L. acidissima</i> showed 100% oviposition deterrent activity at all the tested concentrations against <i>Cx. quinquefasciatus</i> and <i>Ae. aegypti</i> adult females. Conclusion It is concluded that the hexane extract of <i>L. acidissima</i> could be used in an integrated mosquito management program. Citations
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