Autor(es): Kumar, S.; Wahab, N.; Warikoo, R.

Resumo: Objective: To assess the larvicidal and repellent potential of the essential oil extracted from the leaves of peppermint plant, Mentha piperita (M. piperita) against the larval and adult stages of Aedes aegypti (Ae. Aegypti). Methods: The larvicidal potential of peppermint oil was evaluated against early fourth instar larvae of Ae. aegypti using WHO protocol. The mortality counts were made after 24 and 48 h, and LC sub(50) and LC sub(90) values were calculated. The efficacy of peppermint oil as mosquito repellent was assessed using the human-bait technique. The measured area of one arm of a human volunteer was applied with the oil and the other arm was applied with ethanol. The mosquito bites on both the arms were recorded for 3 minutes after every 15 minutes. The experiment continued for 3 hours and the percent protection was calculated. Results: The essential oil extracted from M. piperita possessed excellent larvicidal efficiency against dengue vector. The bioassays showed an LC sub(50) and LC sub(90) value of 111.9 and 295.18 ppm, respectively after 24 h of exposure. The toxicity of the oil increased 11.8% when the larvae were exposed to the oil for 48 h. The remarkable repellent properties of M. piperita essential oil were established against adults Ae. aegypti. The application of oil resulted in 100% protection till 150 min. After next 30 minutes, only 1-2 bites were recorded as compared to 8-9 bites on the control arm. Conclusions: The peppermint essential oil proved to be efficient larvicide and repellent against dengue vector. Further studies are needed to identify the possible role of oil as adulticide, opposition deterrent and ovicidal agent. The isolation of active ingredient from the oil could help in formulating strategies for mosquito control.

Palavras-Chave: Essential oil; Larvicide; Repellent; Bioefficacy; Mentha piperita; Essential oil; Dengue; Aedes aegypti; Larvicidal potential; Adulticide

Imprenta: Asian Pacific Journal of Tropical Biomedicine, v. 1, n. 2, p. 85-88, 2011.

Descritores: Aedes aegypti - Larvicide ; Aedes aegypti - Repellent ; Aedes aegypti - Dengue ; Aedes aegypti - Public health

Data de publicação: 2011

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