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Subject: search.filters.subject.Herbal essential oil

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    Efficacies of essential oils from illiciaceae and zingiberaceae plants as oviposition deterrent, ovicidal, and adulticidal agents against females aedes albopictus (Skuse) and anopheles minimus (Theobald)
    (2018-09-01)
    Cotchakaew, N.
    ;
    Soonwera, M.
    At present, serious mosquito vectors throughout the world have developed resistance to chemical insecticides.Therefore, safe natural products for controlling mosquitoes are absolutely necessary. This study investigated the efficacy of herbal essential oil (EO) from Illiciaceae and Zingiberaceae plants, Alpinia galanga (A. galanga), Amomum krervanh (A. krervanh), Curcuma zedoaria (C. zedoaria), Illicium verum (I. verum), Zingiber cassumunar (Z. cassumunar) and Zingiber mekongense (Z. mekongense) against the females of Aedes albopictus (Ae. albopictus) and Anopheles minimus (An. minimus). All EOs at the high concentration (10%) were highly effective in oviposition deterrent, ovicidal, and adulticidal activities. Ten percent of C. zedoaria EO showed 100% effective repellency with an oviposition activity index (OAI) of -1.0 against the females of the two mosquito species, and 10% I.verum EO showed a high inhibition rate of 100% against the eggs of the two mosquitoes. Ten percent of A. galanga EO showed a high adulticidal activity against the females of Ae. albopictus and An. minimus with KT50 of 0.7 and 1 min at 1h, respectively, and 100% mortality at 24h as well as an LC50 of 7.5 and 2.9%, respectively. When compared with temephos and cypermethrin, the EOs from C. zedoaria, I.verum and A. galanga were more effective in oviposition deterrent and ovicidal activities than temephos and were equivalent in adulticidal activity to cypermethrin. To conclude, our data show that EOs from C. zedoaria, I.verum and A. galanga can be used as an oviposition deterrent, ovicidal and adulticidal agents against Aedes albopictus and Anopheles minimus.
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    Larvicidal and pupicidal activities of essential oils from Zingiberaceae plants against Aedes aegypti (Linn.) and Culex quinquefasciatus say mosquitoes
    (2013-01-01)
    Phukerd, Ubol
    ;
    Soonwera, Mayura
    We conducted this study to investigate the efficacy of herbal essential oils from 12 species of Zingiberaceae plants to determine their larvicidal and pupicidal activity against fourth instar larvae and pupae of Aedes aegypti and Culex quinquefasciatus mosquitoes. Probit analysis was used to analyze the data. Larval mortality was recorded at 1, 5, 10, 15, 30 and 60 minutes and 24 hours. Pupal mortality was recorded at 15 and 30 minutes and 1, 3, 6, 12, 24 and 48 hours. All the essential oils tested showed larvicidal activity. Zingiber cassumunar and Amomum biflorum oils proved to have the greatest activity against Ae. aegypti larvae with LT<inf>50</inf> of 1.4 minutes and 100% mortality at 5 and 10 minutes, respectively. Boesenbergia rotunda, Curcuma zedoaria and Hedychium coronarium essential oils had activity against Cx. quinquefasciatus larvae with LT<inf>50</inf> of 1.7 minutes and 100% mortality at 10 minutes, 5 minutes and 15 minutes, respectively. All the herbal essential oils tested resulted in 100% mortality against Ae. aegypti and Cx. quinquefasciatus larvae at 60 minutes and 30 minutes, respectively. Ae. aegypti and Cx. quinquefasciatus pupae were susceptible to Z. ottensii oil (LT<inf>50</inf> of 0.2 hour) and Z. zerumbet oil (LT<inf>50</inf> of 0.6 hour) and had pupicidal activity with 100% mortality at 6 and 3 hours, respectively. All the essential oils test had pupicidal activity against Ae. aegypti and Cx. quinquefasciatus by inducing 100% mortality at 48 hours.