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African Journal of Biomedical Research
Ibadan Biomedical Communications Group
ISSN: 1119-5096
Vol. 8, No. 1, 2005, pp. 31-33
Bioline Code: md05005
Full paper language: English
Document type: Research Article
Document available free of charge

African Journal of Biomedical Research, Vol. 8, No. 1, 2005, pp. 31-33

 en Larvicidal and Adult Emergence Inhibition Effect of Centella asiatica check for this species in other resources Brahmi (Umbelliferae) against Mosquito Culex quinquefasciatus check for this species in other resources Say (Diptera : Culicidae)
Rajkumar, S and Jebanesan, A

Abstract

Ethanolic extract of Centella asiatica check for this species in other resources leaves were evaluated for the larvicidal and adult emergence inhibition activity against mosquito Culex quinquefasciatus check for this species in other resources under five constant temperatures 19, 22, 25, 28 and 31°C in the laboratory. Toxicity of this extract increased with temperature. The 50% medium lethal concentrations ranged between 6.84 ppm at 19°C and 1.12 ppm at 31°C. A similar trend was observed for the 90% lethal concentrations which varied from 9.12 to 3.63 ppm at the two temperatures, respectively. The adult emergence inhibition activity of this extract at LC50s of different temperatures was generally more pronounced in increased temperatures. These results suggest that the leaf extract of C. asiatica is promising as larvicide and adult emergence inhibitor against Culex quinquefasciatus and might be used directly in small volume aquatic habitats or breeding sites of limited size around human dwellings.

Keywords
Centella asiatica, Culex quinquefasciatus, Larvicidal activity, Adult emergence inhibition activity.

 
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