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VOL. 5, ISSUE 3 (2023)
Guardians of the grains: evaluating the biopesticidal potential of certain plants extracts against the Rice Weevil, Sitophilus oryzae L.
Authors
M Shahreesh, M Madhavi, L Mahesh, L Mayookha
Abstract
Rice (Oryza sativa Linn.) is a vital cereal crop and a staple
food for a significant portion of the global population. However, the rice
weevil (Sitophilus oryzae) poses a serious threat to rice storage,
causing substantial losses and impacting food availability. The current methods
of controlling rice weevils primarily rely on the use of chemical insecticides,
which have led to concerns about resistance development and adverse effects on
human health and the environment. Therefore, there is a growing interest in
exploring alternative approaches using plant-natural products as less harmful
pest control agents. In this study, we assessed the repellent and toxicity efficacy
of crude methanolic leaf extracts from three plant species, namely Caesalpinia
pulcherrima, Clitoria ternatea, and Bryophyllum pinnatum, against
adult rice weevils (S. oryzae). The phytochemical analysis revealed the
presence of alkaloids, flavonoids, polyphenols, and terpenoids in high
quantities in both extracts. The repellency bioassay demonstrated that all
three plant extracts exhibited effective repellent activity against rice
weevils in a time-dependent manner. Br. pinnatum showed the highest repellency
after 120 minutes of exposure, followed by Cl. ternatea and C.
pulcherrima. Furthermore, the contact toxicity bioassay demonstrated
concentration-dependent toxicity of the extracts, with Br. pinnatum exhibiting
the highest toxicity. Probit regression analysis provided the LC50 (lethal
concentration) and LC90 values for each extract, indicating their efficacy.
Overall, the results suggest that these plant extracts have the potential to
serve as natural pesticides for managing rice weevils, offering an alternative
to synthetic insecticides.
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Pages:7-13
How to cite this article:
M Shahreesh, M Madhavi, L Mahesh, L Mayookha "Guardians of the grains: evaluating the biopesticidal potential of certain plants extracts against the Rice Weevil, <i>Sitophilus oryzae</i> L.". International Journal of Agriculture and Plant Science, Vol 5, Issue 3, 2023, Pages 7-13
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