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Pakistan Journal of Biological Sciences
Year: 2002  |  Volume: 5  |  Issue: 7  |  Page No.: 763 - 766

Laboratory Evaluation of Some Indigenous Plant Extracts Against Granary Weevil, Sitophilus granarius L. (Coleoptera:Curculionidae)

Muhammed Saiful Islam, M. Shahjahan, Mohammad Abdul Motaleb and Md. Abdul Hye    

Abstract: The acetone, ethanol, methanol and water extracts of bitter gourd, karanja, mehedi, and urmoi, leaf and seed/bark were evaluated for their growth inhibition, and grain protection effect against granary weevil, Sitophilus granarius L. The highest reduction in number of adults was in urmoi followed by karanja, bitter gourd and mehedi extracts. Extracts of all the four plants showed grain protective effects up to 30 DAT, though the effects of different plant extracts lost gradually with the increase in duration. In most of the cases the extracts of ethanol were more effective than those of other three solvents. The seed extracts were more effective than leaf. Efficacy of the extracts increased proportionally with the increase in doses and decreases proportionally with the increase in time. The extracts did not show any adverse effect on germination capability of wheat seeds even after 3 months of treatments.

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