Larvicidal activity of essential oil from Vitex negundo and Vitex trifolia on dengue vector mosquito Aedes aegypti

Abstract INTRODUCTION: The ability of Vitex trifolia and Vitex negundo essential oils to kill Aedes aegypti and Culex quinquefasciatus larvae was evaluated. METHODS: The larvae were treated with their respective essential oils at 50-125 ppm concentration. RESULTS: LC50 and LC90 for V. trifolia against Ae. aegypti and C. quinquefasciatus, and those for V. negundo against Ae. aegypti were 57.7+0.4, 77.9+0.9 ppm and 55.17+3.14, 78.28+2.23 ppm, and 50.86+0.9, 73.12+1.3 ppm, respectively. Eucalyptol and caryophyllene were the major components in Vitex trifolia and Vitex negundo essential oil, respectively. CONCLUSIONS: This study revealed potential larvicidal properties of essential oil from V. trifolia.

摘要 引言：本研究评估了蔓荆（Vitex trifolia）与黄荆（Vitex negundo）精油对埃及伊蚊（Aedes aegypti）及致倦库蚊（Culex quinquefasciatus）幼虫的杀灭活性。
方法：以50~125 ppm的浓度梯度，分别使用两种精油处理受试幼虫。
结果：针对埃及伊蚊与致倦库蚊的蔓荆精油半数致死浓度（LC50）与90%致死浓度（LC90），以及针对埃及伊蚊的黄荆精油LC50与LC90，依次分别为57.7±0.4、77.9±0.9 ppm，55.17±3.14、78.28±2.23 ppm，以及50.86±0.9、73.12±1.3 ppm。桉叶素（Eucalyptol）与石竹烯（caryophyllene）分别为蔓荆精油与黄荆精油的主要化学成分。
结论：本研究证实蔓荆精油具有潜在的杀幼虫活性。