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Antifeedant Activity of Selected Ethno-botanicals used by Tribals of Vattal Hills on Helicoverpa armigera (Hübner)

Author(s): S Ramya and R Jayakumararaj*

Journal: Journal of Pharmacy Research
ISSN 0974-6943

Volume: 2;
Issue: 9;
Start page: 1414;
Date: 2009;
Original page

Keywords: Ethno-pharmacological activity | Antifeedant Activity | Medicinal Plants | Helicoverpa armigera | insect-pest management | Bio-pest control agents.

Phytochemicals, especially botanical insecticides are currently of interest because of their successful application in plant protection as potential biocontrol agents. Biological activity of leaf aqueous extract of twenty five medicinal plants were evaluated against the VI instar larvae of gram pod borer Helicoverpa armigera (Hübner), (Lepidoptera: Noctuidae). Antifeedant activity of leaf aqueous extracts of Abutilon indicum, Acalypha fruticosa, Achyranthus aspera, Adhatoda zeylanica, Aegle marmelos, Aerva lanata, Albiziza amara, Andrographis lineaeta, Andrographis paniculata, Azadirachta indica, Cardiospermum halicacabum, Cassia tora, Catharanthus roseus, Datura metal, Gymnema sylvestre, Melia azedarach, Ocimum canum, Ocimum sanctum, Pergularia daemia, Plectranthus coleoides, Solanum nigrum, Solanum surattrense, Solanum trilobatum, Tribulus terrestris, Vitex negundo were evaluated in this study. Preliminary screening after 24h of exposure to leaf aqueous extracts of the selected plants at a concentration of 1,000 ppm exhibited significant larval mortality rate. The percentage mortality rate varied considerably between 11.8 and 78.9. The mortality rate was observed in the decreasing order of M. azedarach > A. indica > S. trilobatum > A. paniculata > A. marmelos > A. lineata > S. surattrense > C. roseus > A. zeylanica > A. fruticosa > D. metal > S. nigrum > O. canum > P. coleoides > O. sanctum > P. daemia > A. amara > G. sylvestre > C. halicacabum > V. negundo > A. indicum > C. tora > T. terrestris > A. aspera > A. lanata against the larvae of H. armigera. The results imply that leaf aqueous extract of M. azedarach, A. indica, S. trilobatum, A. paniculata, A. marmelos, A. lineata, S. surattrense, C. roseus, A. zeylanica, A. fruticosa and D. metal can potentially be used as eco-friendly pest control agents against the larvae of H. armigera.
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