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Journal of Biological Sciences

Year: 2009 | Volume: 9 | Issue: 7 | Page No.: 784-787
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Authors

C. Chellaram

S. Jonesh

T. Prem Anand

J.K.P. Edward

Keywords

Research Article

Insecticidal Bustle of Corallivorous Gastropod, Drupa margariticola

C. Chellaram, S. Jonesh, T. Prem Anand and J.K.P. Edward
The aim of this study, the coral reef associated mollusc Drupa margariticola was screened for their insecticidal activity against a dreadful rice pest Sitophilus oryzae, The insecticidal activity of the crude and partially purified extracts of D. margariticola was tested using contact bioassay by the modified method. The extracts of acetone, ethyl acetate and dichloromethane caused 100% (10), 80.67% (8.67±1.25) and 80.0% (8±0.82) mortality respectively against S. oryzae at a concentration of 50 mg mL-1. The 100% acetone column purified fractions of extracts was found cause 100% at a concentration of 20 mg. The ED50 value of crude and column purified acetone extracts of D. margariticola was found to be lower 21.08 and 4.09 mg mL-1, respectively. The extract of D. margariticola screened for insecticidal activity clearly shows that the extract of acetone may possess some biologically active compounds. The exact route of entry is doubtful, which, in future can be cleared with studies on the mode of action of the extract tested.
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