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2000
Volume 21, Issue 9
  • ISSN: 1573-4072
  • E-ISSN: 1875-6646

Abstract

Background

The current method of controlling malaria vectors using synthetic chemicals has caused serious problems for human health and the environment. Hence, a need for alternative, cheap, readily available, and acceptable mosquito control methods.

Objective

To evaluate the bioinsecticidal efficacy of and against using the bioassay method.

Methods

Oil extracts in 5 ml, 25 ml, and 75 ml serially diluted twice in 100 ml of olive oil formed 0.05%, 0.25%, and 0.75%, while 1 m in 100 ml formed 1%. Olive oil only served as a control. Twenty-five female mosquitoes, aged 2-4 days, were blown into tubes containing filter paper-coated essential oils of various concentrations in quadruplicates.

Results

Over 50% mortality was recorded in mosquitoes exposed to 0.75% and 1% compared to others ( <0.05). Knockdown time (KDT) was higher in mosquitoes exposed to 1% compared to others ( <0.05). Generalized linear regressions showed that the essential oils of and contributed 4% (f2 = 0.042) and 14% (f2 = 0.167) to the variability of mortality with time. KDT (9.34 - 131.5 minutes) and KDT (77.6 - 275 minutes) of as well as KDT (162.8 - 233.6 minutes) and KDT (302.8 - 415 minutes) of were recorded. Stigmastane; 4,22-Stigmastadiene-3-one (Area: 45.88%) in and gamma-Sitosterol (16.02%) in were identified by Gas Chromatogram as the highest dose of chemical compounds.

Conclusion

The low bioinsecticidal activities of these plant extracts could be attributed to the low occurrence of terpenoids and alkaloids.

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Effectiveness of Essential Oils from Leaves of Two Plant Species in the Control of Anopheles gambiae
Curr. Bioact. Compd. 21, e15734072323207 (2025); https://doi.org/10.2174/0115734072323207241022172309
/content/journals/cbc/10.2174/0115734072323207241022172309
/content/journals/cbc/10.2174/0115734072323207241022172309
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  • Article Type:     Research Article
Keyword(s): Anopheles; bioinsecticide; insecticide resistance; Mesosphaerum suaveolens; Ocimum gratissimum; susceptibility

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