Tran Minh Hoi, Prabodh Satyal, Le Thi Huong, Dang Viet Hau, Tran Duc Binh, Dang Thi Hong Duyen, Do Ngoc Dai, Ngo Gia Huy, Hoang Van Chinh, Vo Van Hoa, Nguyen Huy Hung, William N Setzer
Mosquitoes, in addition to being a biting nuisance, are vectors of several pathogenic viruses and parasites. As a continuation of our work identifying abundant and/or invasive plant species in Vietnam for use as ecologically friendly pesticidal agents, we obtained the Essential Oils of , , , , and ; analyzed the Essential Oils using gas chromatographic techniques; and screened the Essential Oils for mosquito larvicidal activity against and . The most active larvicidal Essential Oils were , which was rich in thymohydroquinone dimethyl ether (29.4%), ()-β-caryophyllene (19.7%), α-pinene (8.8%), germacrene D (7.8%), and α-humulene (4.3%), (24-h LC 23.4 and 29.1 μg/mL) on and , respectively, and , dominated by 1-undecene (41.9%) and germacrene D (11.0%), (24-h LC 30.1 and 29.6 μg/mL) on the two mosquito species. The Essential Oils of and were also active against mosquito larvae. Notably, , , and Essential Oils were not toxic to the non-target water bug, . However, essential oil showed insecticidal activity (24-h LC 48.1 μg/mL) on . Based on these results, , , and Essential Oils appear promising for further investigations.
