Insecticidal activity of five Chinese medicinal plants against Plutella xylostella L. larvae |
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Authors: | Patcharaporn Vanichpakorn Wei Ding Xiao-Xi Cen |
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Affiliation: | 1. College of Plant Protection, Southwest University, Chongqing 400715, China;2. Department of Plant Science, Faculty of Agriculture, Rajamangala University of Technology Srivijaya, Nakornsrithammarat 80240, Thailand |
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Abstract: | Twenty-five extracts of five Chinese medicinal plant species were screened for insecticidal activity against the diamondback moth, Plutella xylostella L., larvae by a leaf dipping bioassay method. The ethyl acetate, ethanol, and acetone extracts of Veratrum nigrum L. root and rhizome, the ethyl acetate extract of Phytolacca americana L. root, and the petroleum ether extract of Pseudolarix kaempferi Gord. root bark were effective against P. xylostella. Among them, the ethyl acetate extract of V. nigrum showed the strongest insecticidal activity against the second and third instar larvae of P. xylostella, with LC50 values of 225 and 335 ppm, respectively. The other extracts gave little or no insecticidal activity against P. xylostella. These results indicated that V. nigrum may be a promising naturally occurring agent for P. xylostella larval control, and that the organic solvent used for plant extraction can affect its insecticidal activity. |
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