Soonwera, Mayura

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Preferred name
Soonwera, Mayura
Alternative Name
Soonwera, M.
Main Affiliation
Email
mayura.so@kmitl.ac.th

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    Adulticidal activities of Cymbopogon citratus (Stapf.) and Eucalyptus globulus (Labill.) essential oils and of their synergistic combinations against Aedes aegypti (L.), Aedes albopictus (Skuse), and Musca domestica (L.)
    (2020-06-01)
    Soonwera, Mayura
    ;
    Sittichok, Sirawut
    The knockdown and adulticidal activities of individual Cymbopogon citratus and Eucalyptus globulus essential oils (EOs) and their combinations were evaluated against three medical insect pests (Aedes aegypti, Aedes albopictus, and Musca domestica) using a WHO susceptibility test. The knockdown and adulticidal activities against the three medical insect pests of combinations of C. citratus and E. globulus EOs were higher than those of individual EOs alone. Combinations of 7.5% C. citratus + 7.5% E. globulus EOs and 10% C. citratus + 10% E. globulus EOs exhibited the highest efficacy against females of the three species with 100% knockdown and mortality rates at 1 and 24 h after exposure, respectively. Their adulticidal activities were equivalent to that of 10% w/v cypermethrin. In contrast, 70% v/v ethyl alcohol negative control was not effective at all. The combinations of EOs showed a synergistic effect, i.e., their adulticidal activity was improved by 0.2 to 100%, with increased knockdown and mortality rates, compared to individual EOs. The highest synergistic effect on effective knockdown and adulticidal activities against females of the three species was achieved by a combination of 2.5% C. citratus + 2.5% E. globulus EOs, with 36.6 to 100% knockdown rate increase and 33.5 to 98.9% mortality rate increase. This study demonstrates that all tested combinations of C. citratus and E. globulus EOs were effective adulticidal agents against females of Ae. aegypti, Ae. albopictus, and M. domestica and have a high potential for development into a botanical insecticide for controlling populations of Aedes mosquitoes and houseflies.
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    Mosquito-repellent activity of Star anise (Illicium verum Hook.f.), Bustard cardamom (Amomum villosum Lour.) and Best cardamom (Amomum krervanh Pierre.) essential oils against Aedes albopictus (Skuse)
    (2020-01-01)
    Aungtikun, J.
    ;
    Soonwera, M.
    The mosquito repellent activities of essential oils derived from Illicium verum Hook.f., Amomum villosum Lour. and Amomum krervanh Pierre. against Aedes albopictus females were compared with that of a chemical repellent (DEET; N, N-diethyl-3-methylbenzamide). The results showed that the three essential oils at the concentrations of 10% and 5% provided the same 15-minute protection from Ae. albopictus. The essential oils at 1% also provided some 3-minute protection. Comparing the essential oils, it was found that the essential oils at 5% concentration provided the most effective and safe protection against Ae. albopictus, with a protection time of 15minutes, the higher concentration, 10%, provided the same protection rate. DEET at concentrations of 1%, 5% and 10% provided protection times of 15, 30 and 45 minutes, respectively. It can be concluded that the essential oils extracted from I. verum, A. villosum, A.krervanh have a full potential as effective protection against Ae. albopictus females. Although the essential oils were less effective than the synthetic chemical repellent, they are safer to use. It is hereby recommeded that these essential oils were good alternatives and should be further developed into commercial repellent products.
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    Toxicity of Litsea petiolata Hook.f. essential oil against Aedes aegypti (Linn.), Aedes albopictus (Skuse), Anopheles minimus (Theobald) and Culex quinquefasciatus (Say)
    (2022-09-01)
    Puwanard, C.
    ;
    Moungthipmalai, T.
    ;
    Soonwera, M.
    This study evaluated the oviposition deterrent, ovicidal, larvicidal, pupicidal, and adulticidal activities of essential oil (EO) from Litsea petiolata leaves against Aedes aegypti, Aedes albopictus, Anopheles minimus and Culex quinquefasciatus with double choice, dipping, and contact assays. Litsea petiolata EO was tested at 1, 5, and 10% concentrations in ethanol and their efficiencies were compared with those of 1% w/w temephos and 10 % w/v cypermethrin. Oviposition deterrent was evaluated on gravid females. Larvicidal and pupicidal activities were tested on the fourth larvae and 2-day-old pupae. The adulticidal activity was tested against two-day-old adult females. Ten percent of L. petiolata EO exhibited the highest oviposition deterrent activity against gravid females and 100% repellency against Ae. albopictus and An. minimus, 97.0% against Ae. aegypti and 94.6% against Cx. quinquefasciatus. The oviposition activity index (OAI) against females of those four mosquito species ranged from -0.9 to -1.0. Ten percent of L. petiolata EO also exhibited the highest ovicidal activity against the eggs of the four mosquito species, with an inhibition rate ranging from 87.2 to 100%. Moreover, it also showed the highest larvicidal and puicidal activities against the larvae and pupae of the four mosquito species, with a 100% mortality rate at 10 and 60 min, respectively. The adulticidal activity was recorded at 1 and 24h. Ten percent of L. petiolata EO exhibited the highest toxicity to female adults of the four mosquito species, with 100% knockdown (1h) and mortality (24h) rates. On the other hand, 1%w/w temephos did not deter gravid females, and it was only slightly toxic to the eggs and larvae and non-toxic to the pupae. In the same manner, 10%w/v cypermethrin was less effective against the female adults of the four mosquito species than 10% L.petiolata EO. L.petiolata EO is a highly effective and eco-friendly alternative to synthetic insecticides.
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    Combinations of plant essential oils and their major compositions inducing mortality and morphological abnormality of Aedes aegypti and Aedes albopictus
    (2022-05-01)
    Soonwera, Mayura
    ;
    Moungthipmalai, Tanapoom
    ;
    Aungtikun, Jirapon
    ;
    Sittichok, Sirawut
    Extensive uses of synthetic insecticides to control mosquito's populations have induced the insects to develop resistance against them, rendering them ineffective today. Moreover, they cause serious impacts on human health and the ecosystem. Therefore, safe and effective natural alternatives are needed. This study evaluated the larvicidal and pupicidal activities of essential oils (EOs) from Illicium verum and Zanthoxylum limonella and the major constituents against Aedes aegypti and Aedes albopictus mosquitoes as well as recorded their morphological aberrations at death. The GC-MS analysis showed that trans-anethole was the major constituent of I. verum EO, and limonene was the major constituent of Z. limonella EO. Both were more effective against the larvae and pupae of Ae. aegypti than those of Ae. albopictus. A 2.5% I. verum EO + 2.5% trans-anethole combination showed the highest larvicidal and pupicidal effects against Ae. aegypti and Ae. albopictus with an LT<inf>50</inf> ranging from 0.2-6.9 h. Between the two tested constituents, trans-anethole exhibited stronger larvicidal and pupicidal activities (LC<inf>50</inf> ranging 2.4–3.4%) against the two tested mosquito species than d-limonene (LC<inf>50</inf> ranging 2.5–3.7%). Most importantly, 5% trans-anethole, 5% d-limonene, and 2.5% I. verum EO + 2.5% trans-anethole were more effective (LT<inf>50</inf> ranging 0.1–0.3 h) than 1% (w/w) temephos (LT<inf>50</inf> ranging 2.9–3.1 h). Morphological aberrations at death observed were such as color pigment and thorax shape abnormalities. To conclude, trans-anethole, d-limonene, and a combination of I. verum EO + trans-anethole, are natural compounds that not only are as effective as temephos at the time of this study, but should be also be much safer to human health.