Evaluation of Ethyl Acetate Extract of Some Botanicals against Rice Weevil Sitophilus oryzae L. (Coleoptera: Curculionidae) in Stored Maize

Abstract

In the present study, botanicals (11 nos.) were extracted using ethyl acetatesolvent (mid-polar) and evaluated for their fumigant toxicity and repellentactivity at 5% concentration against rice weevil, Sitophilus oryzae L. incomparison with Acorus calamus.The results revealed that all the botanicalswere effective against Sitophilus oryzae compared to untreated control.Mentha spicata 5% ethyl acetate extract exhibited 83.33% fumigant toxicityafter 72 hours of treatment with maximum repellency rate of 76.11%.Ocimum sanctum displayed 80.00% fumigant toxicity with the repellencyrate of 76.11% and grouped under Class IV. Vitex negundo 5% treatmentcaused 83.33% fumigant toxicity, and it was statistically on par with theM. spicata and the repellency rate was 72.78 against S. oryzae. Curcumalonga caused effective repellency rate of 75.56% and was grouped underClass IV. Hence, it is concluded that 5% ethyl acetate extract of M. spicata,V. negundo and O.sanctum were toxic against S. oryzae in stored maize.

DOI

http://doi.org/10.29321/MAJ.10.000500

Pages

247 - 252

Creative Commons

Copyright

© The Author(s), 2025. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

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