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Toxicity of several botanical essential oils and their combinations against females of Aedes albopictus (Skuse) and Anopheles minimus (Theobald): Oviposition deterrent, ovicidal and adulticidal efficacies
(2019-01-01)
Cotchakaew, Nuttavich
;
Soonwera, Mayura
Objective: To investigate the efficacies of 12 essential oil (EO) formulations from three Zingiberaceae plants (Alpinia galanga, Curcuma zedoaria, and Zingiber cassumunar) individually and in combination with an augmenting Eucalyptus globulus (E. globulus) EO against females of Aedes albopictus (Ae. albopictus) and Anopheles minimus (An. minimus). Methods: These formulations were evaluated for their ovicidal, oviposition deterrent and adulticidal activities against Ae. albopictus and An. minimus by a topical method, a double-choice method and a WHO susceptibility test, respectively. Results: It was found that all formulations of Zingiberaceae plants EOs augmented with E. globulus EO were more effective in oviposition deterrent, ovicidal, and adulticidal activities against the two mosquito species than all of the formulations used without E. globulus EO. Their oviposition deterrent, ovicidal and adulticidal activities were equivalent to those of 10% w/v cypermethrin. In contrast, 70% v/v ethyl alcohol as a control alone was not effective at all. The highest synergistic effect in effective repellency against Ae. albopictus was achieved by 5% Alpinia galanga EO + 5% E. globulus EO and against An. minimus was 5% Zingiber cassumunar EO + 5% E. globulus EO. Moreover, the highest synergistic effects in ovicidal activities against Ae. albopictus and An. minimus were achieved by 10% Zingiber cassumunar EO + 10% E. globulus EO and 5% Curcuma zedoaria EO + 5% E. globulus EO, respectively. For the adulticidal activities, the highest synergistic effect against two mosquitoes was achieved by 5% Curcuma zedoaria EO + 5% E. globulus EO. Conclusions: These results suggest that Zingiberaceae plant EOs augmented with E. globulus EO have a high potential to be developed into oviposition deterrent, ovicidal, and adulticidal agents for controlling populations of Ae. albopictus and An. minimus.
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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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Adulticidal, larvicidal, pupicidal and oviposition deterrent activities of essential oil from Zanthoxylum limonella Alston (Rutaceae) against Aedes aegypti (L.) and Culex quinquefasciatus (Say)
(2017-11-01)
Soonwera, Mayura
;
Phasomkusolsil, Siriporn
Objective To evaluate adulticidal, larvicidal and oviposition deterrent response of the essential oil from dried Zanthoxylum limonella (Z. limonella) fruit against Aedes aegypti (Ae. aegypti) and Culex quinquefasciatus (Cx. quinquefasciatus). Methods Z. limonella oil was tested by biological assays at 1%, 5% and 10% concentrations in ethanol. Adulticidal efficacy was tested against the 2–3 day old adult females. Larvicidal activity was tested against immature stage of mosquitoes. Oviposition deterrence of the oil was evaluated on gravid females. Results The adult mortality was observed after 24 h with the LC<inf>50</inf> of 6.0% for Ae. aegypti, and 5.7% for Cx. quinquefasciatus. Larvicidal bioassay was carried out with the 10% Z. limonella oil against immature stages of Ae. aegypti and Cx. quinquefasciatus, which caused 100% mortality after 12 h and 24 h. In the larvicidal experiment, Z. limonella showed effective result at 1%, 5% and 10% concentrations with the values of LT<inf>50</inf> Ae. aegypti = 9.78, 5.61, 0.24 h for larvae and LT<inf>50</inf> = 64.08, 21.23 h for pupae; Cx. quinquefasciatus had LT<inf>50</inf> = 28.46, 20.25, 1.01 h for larvae and LT<inf>50</inf> = 67.52, 27.96, 4.11 h for pupae, respectively. Oviposition deterrence of the oil was evaluated on gravid females. In the study, 10% Z. limonella showed 100% repellency for Ae. aegypti and 99.53% for Cx. quinquefasciatus. Likewise, oviposition activity indexes of these oil concentrations were all negative values ranging from–0.89 to −1.00 for Ae. aegypti and–0.64 to–0.99 for Cx. quinquefasciatus. The oviposition activity indexes values revealed that Z. limonella oil has deterrent effect, and it caused a remarkable negative response resulting in very few eggs. Conclusions This result indicates that Z. limonella oil can be used as an effective adulticide, larvicide and oviposition deterrent against Ae. aegypti and Cx. quinquefasciatus.
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Efficacy of essential oil from Cananga odorata (Lamk.) Hook.f. & Thomson (Annonaceae) against three mosquito species Aedes aegypti (L.), Anopheles dirus (Peyton and Harrison), and Culex quinquefasciatus (Say)
(2015-12-01)
Soonwera, Mayura
The essential oil of Cananga odorata flowers was evaluated for oviposition-deterrent, ovicidal, insecticidal, and repellent activities toward three mosquito species: Aedes aegypti, Anopheles dirus, and Culex quinquefasciatus. Oviposition deterrence of the oil was evaluated on gravid females using oviposition deterrence bioassay. The results showed that 10 % Ca. odorata exhibited high percent effective repellency against oviposition at 99.4 % to Ae. aegypti, 97.1 % to An. dirus, and 100 % to Cx. quinquefasciatus. Ca. odorata oil was tested for ovicidal activity. Regression equations revealed that the ovicidal rates were positively correlated with the concentrations of the essential oil. As the concentration of essential oil increased from 1, 5, and up to 10 % concentration, the ovicidal rate increased accordingly. Larvicidal activity of the oils was used on immature stages (third and fourth instar lavae and pupae). The maximum larval mortality was found with 10 % Ca. odorata against immature stages, and there were LC<inf>50</inf> values ranged from 10.4 to 10.5 % (for Ae. aegypti), <1 % (for An. dirus), and <1 % (for Cx. quinquefasciatus). Adulticidal properties were evaluated with unfed females. Ten percent Ca. odorata oil had high knockdown rates against the three mosquito species at 96 % (for Ae. aegypti), 98.4 % (for An. dirus), and 100 % (for Cx. quinquefasciatus), with EC<inf>50</inf> values of 6.2, 4.7, and 5.4 %, respectively. It gave moderate mortality rates after 24 and 48 h of exposure. Ca. odorata oil was assessed for repellency to females by using the modified K&D module. Ten percent Ca. odorata oil gave the strongest value against Ae. aegypti, An. dirus, and Cx. quinquefasciatus, with percentage repellency of 66, 92, and 90 %, respectively. This study demonstrates the potential for the essential oil of Ca. odorata essential oil to be used as a botanical insecticide against three mosquito species.
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Oviposition deterrent and ovicidal activities of seven herbal essential oils against female adults of housefly, Musca domestica L.
(2014-01-01)
Sinthusiri, Jirisuda
;
Soonwera, Mayura
The oviposition deterrent and ovicidal of seven herbal essential oils derived from Citrus sinensis, Cymbopogon citratus, Eucalyptus glubulus, Illicium verum, Lavandula angustifolia, Mentha piperita, and Zingiber cussumunar were assessed against the gravid female of housefly, Musca domestica L., under laboratory conditions and compared with commercial insecticide (10 % w/v cypermethrin). They were assayed at three concentrations (1.0, 5.0, and 10.0 %) where plastic cups containing 1 ml of desired oil concentration and cotton pad soaked with 10 ml of milk solution (10 % w/v) were used as oviposition substrate. The 0.1 ml of deferent concentrations was dropped on ten housefly eggs, which were used for ovicidal activity. The number of eggs laid and the hatched larvae in each cup was recorded to evaluate the oviposition deterrent and ovicidal activities of the herbal essential oils. High concentration (10 %) of herbal essential oils showed high percent effective repellency (ER). The 10 % I. verum oil caused complete oviposition deterrence (100 % ER, oviposition activity index (OAI)=-1.0), followed by Z. cussumunar, M. piperita, L. angustifolia, C. citratus, C. sinensis, and E. glubulus oils with 97.20, 88.55, 88.14, 87.93, 76.68, and 57.00 % ER, respectively. As the concentration of herbal essential oils increased from 1.0, 5.0, and up to 10.0 % concentration, the hatching rate decreased. Ten percent I. verum oil gave the maximum inhibiting rate at 97.3 % (LC<inf>50</inf> value of 6.85 %); in addition, the other herbal essential oils showed the minimum inhibiting rate of 3.3-22.7 %. On the other hand, cypermethrin 10 % w/v showed complete oviposition deterrence (100 % ER, OAI=-1.0) and ovicidal activity (100 % inhibiting rate). Our data showed that I. verum oil have high potential of oviposition deterrence and ovicide housefly control. © 2014 Springer-Verlag.
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