International Journal of Entomology Research

Authors
Mangaiyarkarasi R, Sajani Jose

Abstract
In the present study, the leaf powder of two medicinal plants, Annona muricata and Cinnamum verum were tested against rice weevil Sitophilus oryzae for insecticidal properties and also for their biological grain protectant. Response varied with plant species. The leaf powders were tested in stored rice grain. In treatment, the sterilized rice grains were treated with five pairs of rice weevil. Adult insects were exposed to 5g of A. muricata and C. verum powder rice grains (20gms) for a time period of five weeks (35 days). The mortality was assessed after 1day, 7 days, 14 days, 21 days, 28 days and 35days.The mortality was increased in dose dependent manner. The mortality of adults increased with increasing dose concentrations. The results of the study showed that maximum mortality of S. oryzae was observed at 5g of grain protectant during fifth week of treatment. A. muricata leaf powdershowed highest grain protectant efficacy when compared to C. verum leaf powder. It appeared that the leaf powder had some insecticidal activities against S. oryzae adult.