Potent insecticidal activity of fruits and leaves of Capsicum frutescens (L.) var. longa (Solanaceae)

By Vinayaka K. S, Prashith Kekuda T. R, Nandini K. C, Rakshitha M. N, Ramya Martis, Shruthi J, Nagashree G. R and Anitha B

Capsicum frutescens (L.) var. longum (Solanaceae) is a well used tropical and subtropical medicinal plant. The present study was undertaken to investigate insecticidal activity of different concentrations of methanol extract of fruits and leaves of C. frutescens against 2nd and 3rd instar larvae of Aedes aegypti. The mortality of the larvae was found to be concentration dependent. Among larvae, 2nd instar larvae were shown to be more sensitive than 3rd instar larvae. The fruit extract has shown more killing effect than leaf extract. Preliminary phytochemical analysis showed the presence of tannins, alkaloids, steroids and glycosides in both extracts. The larvicidal activity of methanol extract may be attributed to the presence of phytoconstituents. This is the first report on the insecticidal potential of C. frutescens. Further studies on isolation of active compounds, mechanism of action, toxicity and field trials are under investigation.


Key words: Capsicum frutescens, Phytochemical analysis, Aedes aegypti, Larval mortality.

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