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VOL. 11, ISSUE 1 (2026)
Investigation of the miticide and repellent effect of extracts of leaves of Eucalyptus camaldulensis and Myrtus communis against adults and larvae of the mosquito Culex quinquefasciatus
Authors
Dr. Ghazwan Thamer Khadir Al-Rashidi
Abstract
The study revealed a wide range of secondary metabolites, volatile
oils, alkaloids, phenols, terpenoids, flavonoids, glycosides, saponins, and
steroids in different proportions. Alcohols, glycerol, and cholesterol were
also identified in the leaf extracts of Eucalyptus camaldulensis and Myrtus
communis. While FAMEs were analyzed, it was found that the ethanolic and
aqueous extracts of E. camaldulensis leaves had a high ability and significant
difference in killing the larval stage of the Culex quinquefasciatus
mosquito at rates between 96% and 89% at a concentration of 10 mg/L,
respectively, of the total number of larvae (20) within three days under
standard conditions. The mortality rate of the larval stage decreased when the
concentration was reduced to 1 mg/L, reaching 46% and 39%, respectively,
compared to the control group, in which natural mortality did not exceed 0.2%.
As for the leaf extract of E. camaldulensis, M. communis witnessed a
significantly lower percentage of larval mortality for the ethanolic and aqueous
extracts, as it recorded percentages ranging between 91% and 82% at a
concentration of 10 mg/L, respectively. When the concentration decreased to 1
mg/L, it recorded significant percentages of 46% and 39%, respectively.
According to the study, the repellent ability of pregnant adults for the
ethanolic and aqueous extracts of E. camaldulensis and M. communis leaves was
very high, as it was shown that the ethanolic and aqueous extract of E.
camaldulensis leaves recorded a decrease in the number of egg rafts from 29.6
rafts in the control group to 6.6 and 11.5 rafts, respectively, with the number
of eggs in each raft being reduced to 30% within 7 days. As for the extract of
M. communis leaves, it recorded a significantly higher significant difference than
the control group and a statistically significant significant difference from
the leaves of E. camaldulensis, as the aqueous extract of M. communis recorded
4.6 and 6.6, respectively, within 7 days, and the number of eggs decreased by
40-50%. This may be the maximum repellent effect of all the extracts under
study. It appears that M. communis extracts are the best at repelling female
mosquitoes from egg-laying sites.
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Pages:338-344
How to cite this article:
Dr. Ghazwan Thamer Khadir Al-Rashidi "Investigation of the miticide and repellent effect of extracts of leaves of <i>Eucalyptus camaldulensis</i> and <i>Myrtus communis</i> against adults and larvae of the mosquito <i>Culex quinquefasciatus</i>". International Journal of Entomology Research, Vol 11, Issue 1, 2026, Pages 338-344
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