Soonwera, Mayura

Preferred name

Soonwera, Mayura

Alternative Name

Soonwera, M.

Main Affiliation

School of Agricultural Technology

mayura.so@kmitl.ac.th

Now showing 1 - 10 of 13

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Synergistic Larvicidal and Pupicidal Effects of Monoterpene Mixtures Against Aedes aegypti with Low Toxicity to Guppies and Honeybees
(2025-07-01)
Sittichok, Sirawut
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Passara, Hataichanok
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Moungthipmalai, Tanapoom
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Sinthusiri, Jirisuda
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Murata, Kouhei
The present study evaluated the larvicidal and pupicidal activities of pure and mixed monoterpene formulations—eucalyptol, geranial, trans-anethole, and trans-cinnamaldehyde—against Aedes aegypti and compared them with 1% (w/w) temephos. Safety bioassays of all formulations on non-target species confirmed their safety. The combined mixture of eucalyptol + trans-anethole at 400 µg/mL exhibited stronger larvicidal activity, with an LC<inf>50</inf> of 176 µg/mL, while the combination of trans-anethole + geranial at 400 µg/mL exhibited stronger pupicidal activity with an LC<inf>50</inf> of 167 µg/mL. Both formulations were more effective than a 1% temephos. All the mixture formulations were more strongly synergistic compared to pure formulations, with an increased mortality value (IMV) of 25% to 95%. External morphological aberrations observed at death included swelling of the respiratory system. Importantly, all the formulations were safe for two non-target species: guppies (Poecilia reticulata) and honeybees (Apis mellifera). The combination formulations are strong larvicides and pupicides for controlling Ae. Aegypti, which will help reduce the spread of viruses carried by this vector.
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Impact of botanical essential oils on pupation and survival of Musca domestica L.
(2026-05-01)
Moungthipmalai, T.
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Sriboonjit, N.
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Khuendee, P.
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Phunglakchai, J.
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Thongsaiklaing, M.
Among the tested botanical extracts, Illicium verum (star anise) essential oil at 10% demonstrated the highest efficacy in disrupting normal pupal development. Only 65.00% of individuals successfully emerged as fully developed adults after a 10-day exposure period. A notable proportion exhibited transitional deformities, particularly malformed pupal-adult intermediates, indicating interference with metamorphic progression. In comparison, cypermethrin, a commonly applied synthetic insecticide at the same concentration, resulted in a lower mortality rate of 39.67% under identical experimental conditions. The superior performance of star anise oil highlighted its potential as a plant-derived alternative for insect control. These findings suggested that the incorporation of such natural products into integrated pest management strategies may reduce dependence on conventional synthetic chemicals.
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Head lice prevalence in suburban Bangkok, Thailand, after the COVID-19 pandemic and herbal shampoo treatment
(2026-01-01)
Sinthusiri, J.
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Sittichok, S.
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Passara, H.
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Soonwera, M.
The prevalence of pediculosis among 3,461 girls from 10 government kindergartens and primary schools in Ladkrabang district was 48.1% in the 1st semester (May-September 2022) and 44.6% in the 2nd semester (November 2022-March 2023), higher among primary school girls, at 51.8-55.4%, than in kindergarteners, at 30.2-33.1%. Over 80% of the infested girls came from a low-income family (<3,000 USD per year). The Zingiberaceae essential oil and shampoo treatments were highly effective with 100% cure rate for every infested girl after the 2nd treatment (on Day 10, after the 1st treatment on Day 1). Effective strategies for reducing head lice prevalence are improved living standards and head lice eradication by treatments with effective natural pediculicides and improved head lice educational program.
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Binary Mixtures of Essential Oils: Potent Housefly Adulticides That Are Safe Against Non-Target Species
(2025-08-01)
Passara, Hataichanok
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Sittichok, Sirawut
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Moungthipmalai, Tanapoom
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Laosinwattana, Chamroon
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Murata, Kouhei
In this study, we investigated the insecticidal potential of Eucalyptus globulus Labill. and Cymbopogon citratus Stapf essential oils (EOs), both alone and in synergistic blends with their primary active compounds, against adult houseflies (Musca domestica L.). Toxicity assessments were also conducted on non-target organisms—dwarf honeybees (Apis florea Fabricius) and guppies (Poecilia reticulata Peters)—to evaluate environmental safety. All binary EO mixtures demonstrated superior efficacy compared to individual EOs and the synthetic pyrethroid α-cypermethrin (1% positive control). The most potent formulation, combining 2.5% (v/v) geranial with 2.5% (v/v) E. globulus EO, exhibited a synergistic effect, achieving complete fly mortality (LT<inf>50</inf>: 0.06 h). This mixture’s mortality index significantly exceeded those of single-component formulations, with a mortality index of 0.22, confirming greater toxicity to flies than α-cypermethrin. Importantly, all the tested EOs and their blends were non-toxic to honeybees and guppies; in comparison, α-cypermethrin caused significant harm. These findings highlight the 2.5% (v/v) geranial + 2.5% (v/v) E. globulus EO blend as a highly effective and environmentally friendly alternative to conventional insecticides. Further research is recommended to optimize its formulation for practical use in sustainable fly management.
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Synergistic Adulticidal Activity of Lemongrass (Cymbopogon citratus), Star Anise (Illicium verum), Nutmeg (Myristica fragrans) Essential Oil and Their Components Against the Housefly (Musca domestica) and Their Safety for Key Non-Target Organisms
(2026-04-01)
Passara, Hataichanok
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Laosinwattana, Chamroon
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Moungthipmalai, Tanapoom
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Murata, Kouhei
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Soonwera, Mayura
Botanical insecticides containing a mixture of plant essential oils (EOs) are considered suitable for the management of houseflies (M. domestica). The adulticidal efficacies of single EOs and mixtures of EOs, including lemongrass (C. citratus), star anise (I. verum), nutmeg (M. fragrans), and their components (geranial, trans-anethole, and α-pinene), against houseflies were determined in comparison to 2% (w/v) α-cypermethrin as the positive control and distilled water as the negative control. The mixture of star anise EO (1%) + geranial (1%) was the most effective adulticide, superseding single EOs, other combinations of EOs, and its active component, α-cypermethrin, and distilled water. This mixture was highly synergistic and was found to be over 74% more toxic than all single EOs and almost 2.6 times more toxic than α-cypermethrin. Furthermore, the tested EOs did not cause mortality in guppies (P. reticulata) or earthworms (E. fetida), and caused a maximum of 48% mortality in honeybees (A. mellifera) at 24 h; by contrast, α-cypermethrin led to 100% mortality in honeybees within 0.5 h and in guppies and earthworms within 24 h, although it had low toxicity toward houseflies. Thus, a mixture of star anise EO + geranial is a promising source of EO-derived insecticides for housefly control that is also safe for important non-target species.
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Adulticidal activity of star anise, turmeric, cloves and combinations against houseflies
(2025-01-01)
Sinthusiri, J.
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Soonwera, M.
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Puwanard, C.
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Passara, H.
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Thongsaiklaing, T.
The small droplet size could increase the absorbed ingredients and high stability. The star anise nanoemulsion was determined optimum efficacy, with a 1% concentration resulting in the highest knockdown and mortality rate of 100%. Its KT<inf>50</inf> and mortality effective values were 28 min and 36 times, respectively. Furthermore, the adult stage of houseflies is found to be susceptible to star anise nanoemulsion. In contrast, cypermethrin was less toxic to it, with a high KT<inf>50</inf> and resistance to adult houseflies. Consequently, the star anise nanoemulsion could be developed into an efficient and safe environment for controlling housefly populations.
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Plant essential oils, trans-anethole and eugenol, for housefly knockdown and mortality
(2025-03-01)
Sittichok, S.
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Passara, H.
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Sinthusiri, J.
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Soonwera, M.
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Thongsaiklaing, T.
The knockdown and mortality of some compounds from natural oils (trans-anethole, eugenol and a combination of trans-anethole and eugenol) against adult houseflies (Musca domestica) compared with cypermethrin was investigated. The knockdown and mortalities were highest at 100% of 1% trans-anethole with KT50= 31 min and LT50 = 31 min. The mortality index of trans-anethole was 82.1 times that of cypermethrin. In contrast, 1% eugenol had knockdown and mortality was 36% and 0.5% trans-anethole + 0.5% eugenol had knockdown and mortality of 68%, with mortality indexes of 1.6 and 3.2 times versus cypermethrin. The trans-anethole high toxicity and low residue made it a superior control for houseflies.
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Terpenoid Mixtures as Repellents Against the American Cockroach: Their Synergy and Low Toxicity Against Non-Target Species
(2026-01-01)
Passara, Hataichanok
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Moungthipmalai, Tanapoom
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Laosinwattana, Chamroon
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Sittichok, Sirawut
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Murata, Kouhei
The repellent activities (Periplaneta americana) of lone and binary mixtures of terpenoids—geranial, trans-anethole, and trans-cinnamaldehyde—against adult American cockroaches were evaluated in this study. The respective efficacies of these mixtures were compared with that of 12% (w/w) DEET. Safety bioassays for all formulations on non-target species, namely, earthworms (Eudrilus eugeniae) and guppy fish (Poecilia reticulata), were conducted to identify natural compounds with repellent efficacy equal to or surpassing that of DEET while ensuring ecological safety for non-target organisms such as fish and earthworms. All mixtures (RC<inf>50</inf> of 0.3 to 1.6 µL/cm3) were more effective than all lone terpenoids (RC<inf>50</inf> of 6.2 to 9.1 µL/cm3) and DEET (RC<inf>50</inf> of 3.0 µL/cm3), demonstrating strong synergy, with an increased repellent value (IV) of 79 to 96%. The strongest repellency, 98.0% at 72 h and an RC<inf>50</inf> of 0.3 µL/cm3, was achieved using geranial + trans-cinnamaldehyde (1:1). This mixture was 5.9 to 10 times more effective as a repellent than DEET. The toxicity of every lone terpenoid and terpenoid mixture to non-target species was low; hence, these mixtures can be considered safe, whereas DEET was highly toxic to non-target species (100% mortality). The terpenoid mixture geranial + trans-cinnamaldehyde showed strong repellency against P. americana.
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Tick fauna in grasslands on Mt. Aso and the possibility of the tick reduction to cattle by the essential oil
(2025-12-08)
Shibuya, Hikaru
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Tamagawa, Yoshiki
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Murata, Kouhei
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Tanapoon, Moungthipmalai
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Puwanard, Cheepchanok
The objectives of this study were to evaluate the tick fauna in the Aso region and the repellent effects and acaricidal activity of three plant–derived essential oils against ticks. It was revealed that the most dominant species of tick in the region was Haemaphysalis longicornis, with large annual fluctuations in the number of juvenile stages. The essential oils also showed significant repellent effects against H. longicornis and were highly toxic to this species. These results suggest that spraying essential oils on cattle in spring and autumn, when juvenile stages emerge, may be useful in controlling this species by disrupting infestation.
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Anise and Fennel Essential Oils and Their Combination as Natural and Safe Housefly Repellents
(2025-01-01)
Passara, Hataichanok
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Sittichok, Sirawut
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Puwanard, Cheepchanok
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Sinthusiri, Jirisuda
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Moungthipmalai, Tanapoom
Essential oils (EOs) are effective repellents and eco-friendly alternatives. We tested single and combination EOs of fennel and anise for repellency and stability against houseflies. All treatments were stored at 27 °C for up to 360 days. Efficacies were compared against α-cypermethrin as a reference. Safety bioassay used on two representative non-target species (guppies and earthworms) confirmed safety. The strongest repellency and stability, 100% repellency and RC<inf>50</inf> of 0.4 mL/m3 on day 1, was achieved by a fennel + anise EO combination (1:1). After 360 days, these combinations remained effective (95% repellency), and RC<inf>50</inf> = 0.8 mL/m3. The EO combinations were more effective than all single EOs and α-cypermethrin at all times, showing strong synergy with a synergistic repellent index of 2.4 to 3.3. This fennel + anise EO combination was more than 24 times more effective as a repellent than α-cypermethrin. Morphological damage included damaged antennae with twisted flagella and abnormal aristae. All single and combination EOs were not toxic to the non-targets and could be considered safe, whereas α-cypermethrin was highly toxic to them. Thus, the fennel + anise EO combination has great potential to be developed as a safe, natural repellent for managing housefly populations.

Soonwera, Mayura

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