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VOL. 9, ISSUE 9 (2024)
Bio-larvicidal potential of leaf extracts of selected plant species against dengue vector, Aedes aegypti L.
Authors
Seema Garg
Abstract
The major vector for dengue disease, zika, chikungunya, and urban
yellow fever is believed to be Aedes aegypti. Concerns about the
environment hazards and pesticide resistance to conventional pesticides, plant
extracts are getting more attention as natural insecticidal remedies for
getting rid of mosquito vectors because of their rich quantity of bioactive
components. The current study set out to determine the effectiveness of acetone
extracts of leaves from four affordable and easily available native plant
species: Acacia nilotica (Mimosaceae), Eucalyptus rudis
(Myrtaceae), Bignonia capreolata (Bignoniaceae), and Jasminum
arborescens (Oleaceae) as larvicides against Aedes aegypti
mosquitoes. Three concentrations (1%, 1.5%, and 2%) of each plant extracts in
acetone were applied to Aedes aegypti larvae in the fourth instar.
Larval mortality was then measured after 24, 48, and 72 hours of treatment.
With an increase in dosage concentration and treatment duration, the extracts
demonstrate increase in larvae mortalty. Following 24 hours of treatment, the
highest mortality rate (100%) was observed in 2% of Jasminum arborescens.
This was followed by 93.35% and 85% mortality in 2% doses of Eucalyptus
rudis and Bignonia capreolata, after 72 hours of treatment. Even
after 72 hours of treatment, none of the extracts demonstrated significant
mortality at 1% dose. To better understand the potency of these plant extracts,
their LC50 and LC90 values were determined after 24, 48,
and 72 h post-exposure. Among the tested extracts, Acacia nilotica
exhibited the highest LC50 and LC90 values (4.89, 2.57,
1.94 and 24.54, 7.24, 5.37), suggesting lower toxicity, while Eucalyptus
rudis showed the lowest LC50 values and LC90 (1.38,
1.20, 1.07 and 2.34. 2.17, 1.70), indicating high toxicity to Aedes aegypti
mosquito larvae.
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Pages:85-90
How to cite this article:
Seema Garg "Bio-larvicidal potential of leaf extracts of selected plant species against dengue vector, <i>Aedes aegypti</i> L.". International Journal of Entomology Research, Vol 9, Issue 9, 2024, Pages 85-90
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