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Subject: search.filters.subject.Ovicidal activity

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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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    Ovicidal effect of essential oils from Zingiberaceae plants and Eucalytus globulus on eggs of head lice, Pediculus humanus capitis De Geer
    (2018-08-01)
    Soonwera, Mayura
    ;
    Wongnet, Orawan
    ;
    Sittichok, Sirawut
    Background: Head lice infestation is an important public health problem worldwide. Chemical pediculicides have lost their efficacy because lice have developed resistance to them. Therefore, alternative pediculicides such as essential oils and herbal products have been proposed for treating head lice infestation. Study design: To determine the efficacy of essential oils from three Zingiberaceae plants (Curcuma xanthorrhiza, Curcuma zedoaria and Zingiber zerumbet) against head lice eggs and to investigate an augmenting substance (Eucalyptus globulus EO) for improving the efficacy of these essential oils in killing head lice eggs, especially on the inhibition of their hatching process. Permethrin pediculicide, soyabean oil, and drinking water were used as positive, negative, and neutral controls, respectively. Methods: An immersion test was used to evaluate the ovicidal activity of 12 essential oil formulations. Head lice eggs were immersed for 1, 5 and 10 min in the treatments. Mortality rate was observed on day 7 and day 14; mortality was checked under a stereomicroscope. Results: All head lice eggs that were immersed in a combination of 10% C. zedoaria EO and 10% E. globulus EO for 5 min did not hatch at all for 7–14 days of incubation. All head lice eggs that were immersed in soyabean oil and drinking water for 1, 5, and 10 min showed 100% hatching rate in 7–14 days of incubation. All head lice eggs that were immersed in permethrin pediculicide for 1, 5 min, showed 100% hatching rate, but when they were immersed for 10 min, permethrin provided 4.0–6.0% inhibition rate with 94.0–96.0% hatching rate for 7–14 days of incubation. All combinations of Zingiberaceae EOs and E. globulus EO at low and high concentrations (5 and 10%) exhibited high ovicidal activities against head lice eggs, and the combinations showed a synergistic effect with an increase in the inhibition rate of more than 50%. Conclusion: These results demonstrated that Zingiberaceae EOs augmented with E. globulus EO are promising ovicidal agents for head lice control.