Chemical composition and larvicidal activity of essential oils from Zingiber montanum (J. Koenig) Link ex. A. Dietr. against three mosquito vectors

The chemical composition and larvicidal activity of essential oils derived fromthe leaves and rhizomes of Zingiber montanum (J. Koenig) Link ex. A. Dietr. werereported. The main compounds in the leaf oil were -pinene (13.8%), -phellandrene(11.3%) and -pinene (7.3%) while the rhizome oil was dominated by sabinene (41.1%),terpinen-4-ol (22.7%) and (E)-nerolidol (14.3%). The minimum lethal concentration(larvicidal activity) LC50 of the rhizome oil at 24 h against Aedes albopictus was 35.17μg/mL, while LC50 values of 32.20 μg/mL and 31.12 μg/mL were obtained against Aedesaegypti and Culex quinquefasciatus respectively. At 48 h the oil displayed larvicidalaction with LC50 values of 23.18 μg/mL, 25.58 μg/mL and 18.99 μg/mL respectively towardsAe. albopictus, Ae. Aegypti and Cx. quinquefasciatus. The leaf oil did not exhibitsignificant mortality and larvicidal action. The results indicate the potential ofrhizome essential oil of Z. montanum as a source of larvicidal agent.