Machilus thunbergii (Laurales: Lauraceae, 후박나무) is planted as a street tree in Jeollanamdo and Jeju Island. Orthaga olivacea (Lepidoprate: Pyralidae, 제주집명나방) is known as a major pest of M. thunbergii. For managing O. olivacea by eco-friendly control method, the mating disruption would be expected. The sex pheromone of O. olivacea was identified as a mixture of (Z)-11-hexadecenyl acetate (Z11-16Ac), (Z)-11-hexadecenal (Z11-16Ald), and (Z)-11-hexadecenol (Z11-16OH) at a ratio of 100: 0.1:0.1 by Chinese research group. Before applying mating disruption, confirmation of its attraction in Korea was essential. The pheromone traps composed of Z11-16Ac alone and the blend of three components (100:0.1:0.1) were installed in Haenam, Jeollanamdo in 2021, and Jeju and Seogwipo, Jeju in 2022. In field attraction test, no O. olivacea was attracted to any trap. However, Mamesastra brassicae (Lepidoptera: Noctuidae), which was not intended, was caught in both years in the trap. Total of 19 in Haenam between September 23 and 30, total of 11 in Jeju between September 30 and October 28, and total of 108 in Seogwipo between September 15 and November 11 were caught to the trap lured with Z11-16Ac. While in the trap lured with the blend, total 1 and 6 were captured in Haenam and Seogwipo, respectively.

The larvicidal activities of 11 Myrtaceae essential oils and their components against Aedes aegypti were tested by the immersion method. We also tested the acute toxicity of 4 active oils and their components against the water flea, Daphnia magna. Further, the aqueous residues of these oils and their components were determined at 2 and 7 days after suspending in water. Among the 11 oils tested, 0.1 mg/mL of Melaleucalinariifolia, M. dissitiflora, M. quinquenervia, and Eucalyptus globulus oils showed strong larvicidal activity against A. aegypti. Among the test compounds, allyl isothiocyanate, γ-terpinene, p-cymene, (+)-limonene, (-)-limonene, γ-terpinene, and (E)-nerolidol showed strong larvicidal activity against A. aegypti. The acute toxicity test revealed M. linariifolia was the most toxic to D. magna. Among test compounds, allyl isothiocyanate was the most toxic to D. magna. Two days after treatment, the residues of M. dissitiflora, M. linariifolia, M. quinquenervia, and E. globulus oils in water were 55.4, 46.6, 32.4, and 14.8%, respectively. Low concentrations of allyl isothiocyanate, γ -terpinene, p-cymene, (-)-limonene, (+)-limonene, and γ-terpinene were detected in the water at 2 days after treatment. Therefore, Myrtaceae essential oils and their components could be developed as control agents against mosquito larvae.