International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Screening of botanicals against the adults of rice weevil, Sitophilus oryzae L.

  • S. Rajashekara (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus) ;
  • R. Kiran (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus) ;
  • V. Bhavya (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus) ;
  • C. Chithrashree (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus) ;
  • V. Chaitra (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus) ;
  • Deepti Ravi Joshi (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus) ;
  • M. G. Venkatesha (Insect Science Laboratory, Department of Studies in Zoology, Bangalore University, Jnana Bharathi Campus)
  • Received : 2023.02.20
  • Accepted : 2023.07.21
  • Published : 2023.09.30
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Abstract

Sitophilus oryzae L. (Rice Weevil) is a stored pest of rice that causes extensive loss throughout the world. We tested the leaf powders of 12 plant species viz., Chrysanthemum sp., Cinnamomum zeylanicum, Citrus grandis, Citrus limon, Gliricidia sepium, Gymnema sylvestre, Hemigraphis colorata, Michelia champaca, Moringa oleifera, Murraya koenigii, Polyalthia longifolia, and Sauropus androgynus at dosages of 1.00, 1.50, 2.00 and 3.00g against the adult rice weevil and mortality was recorded at 1, 2, 3, 5, 7, 12 and 2l days after treatment (DAT) by direct contact toxicity for their adulticidal effect. We observed 100 percent adult mortality in C. zevlanicum and M. koenigii among the tested leaf powders. In addition, the first-time tested H. colorata and S. androgynus also caused high mortality compared to other plants. All the plant powders caused moderate to high adult mortality. Hence, these plants could be effective botanical insecticides against S. oryzae as they comprise a potential source of bioactive chemicals and are generally free from toxicants. Applications of these natural derivatives in S. oryzae control could reduce the cost of control methods and storage of rice contamination. Therefore, the present study indicates that some plant extracts can be used as an alternative to toxic synthetic chemicals in the management of rice weevils.

Keywords

Acknowledgement

We would like to thank Dr. T. M. Ramakrishna, Retired Professor and Guest Faculty, School of Natural Sciences, Department of Biological Sciences, Jnana Bharathi Campus, Bangalore University, Bengaluru 560 056 for his help in identifying the plants.

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