The evaluation of in vitro repellency and acaricidal efficacy of Aloe ferox and Acokanthera oppositifolia crude extracts against Amblyomma hebraeum ticks
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Date
2024
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Journal ISSN
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Publisher
Acta Scientific Veterinary Sciences
Abstract
fluenced the repellency and acaricidal activity against adult engorged female Ambylomma hebraeum ticks. The researchers analyzed
the acetone, methanol, and ethanol extracts of both plant species. The experiment followed a completely randomized design with a
factor arrangement of 2 (plant species), 3 (organic solvent extraction methods: acetone, methanol, ethanol), and 3 (concentration
levels: 15%, 30%, 50%). Distilled water and Dazzel dip (15% and 30%) were employed as negative and positive controls, respectively.
Repellency was assessed over a six-hour period, while acaricidal activity was measured over seven days. The results of the study
demonstrated that the solvent extracts of Aloe ferox and Acokanthera oppositifolia exhibited a repellent effect ranging from 6% to
89%. Acetone extracts, overall, displayed lower repellency activity compared to methanol and ethanol extracts, with percentages of
58%, 66.5%, and 80.5% for acetone, ethanol, and methanol, respectively. At a concentration of 15% for all solvents, the repellency
effect was observed to be 14% for acetone, 9.5% for ethanol, and 11% for methanol. Irrespective of the solvent extraction method
used, a higher repellency activity was observed at the 50% concentration level, with statistical significance (P < 0.05). The acaricidal
activity of Aloe ferox and Acokanthera oppositifolia significantly increased with the concentration of the extracts. It was concluded
that Aloe ferox and Acokanthera oppositifolia plants possess repellent and acaricidal activities, particularly at a 50% concentration for
acetone and methanol extracts, respectively. Additionally, Acokanthera oppositifolia demonstrated a higher repellency activity, while
Aloe ferox exhibited stronger acaricidal activity
Description
This study aimed to investigate the acaricidal and repellent effects of solvent extracts from Aloe
ferox and Acokanthera oppositifolia in the control of Amblyomma
hebraeum ticks
Keywords
Ethno-Veterinary, Medicinal plants, Herbal remedies, Repellency, Ticks, Tick resistance, Namibia, University of Namibia