Larvicidal and Ovicidal Properties of Essential Oils Derived from Origanum minutiflorum and Salvia dorystoechas against the Aedes aegypti

Abstract

This study assessed the larvicidal and ovicidal effects of essential oils extracted from the above ground of Origanum minutiflorum and Salvia dorystoechas, belonging to the Lamiaceae plant family, on Aedes aegypti mosquito larvae and eggs. The research utilized essential oil concentrations ranging from 1 to 100 ppm. Larvicidal activity was evaluated 6 hours post-exposure and subsequently at 24-hour intervals over a period of 5 days while ovicidal activity was monitored every 2 days for a total of 10 days. Findings indicated that both essential oils demonstrated significant larvicidal effects at 50 and 100 ppm concentrations against Ae. aegypti larvae. In contrast, ovicidal effects were not observed to be statistically significant. Throughout the experiment, O. minutiflorum essential oil consistently showed higher larvicidal potency compared to S. dorystoechas. Therefore, while essential oils from both O. minutiflorum and S. dorystoechas effectively target Ae. aegypti larvae, especially at elevated concentrations, they did not exhibit ovicidal properties.