Mass mortality of oak trees has been reported in Korea since 2004. It seemed to be occurred by a possible pathogenic fungus Raffaelea quercus-mongolicae and spread by an ambrosia beetle, Platypus koryoensis (Coleoptera: Platypodidae) which was a vector of that fungus. P. koryoensis attacked healthy or stressed living Quercus mongolica. The numbers of damaged and/or died Q. mongolica by P. koryoensis has increased every year since its first report. The damages caused by Platypus spp. were reported world widely. Pinehole borers P. caviceps, P. apicalis and P. gracilis damaged and killed living southern beech (Nothofagus spp.) and/or Kamawi (Weinmannia racemosa) in New Zealand. The relationship between pinhole bores, the fungal pathogen Sporothrix and their host beech is well established. P. subgranosus was responsible to death of myrtle beech (N. cunninghamii) in Tasmania, Australia. In southern Europe, P. cylindrus attacked cork oak (Quercus suber), and Phytophthora cinnamoni was known as a pathogen. P. mutatus was a primary pest to poplars, especially Populus deltoides in South America. Alfaro et al. warned on the threat of P. mutatus to world poplar resources since its introduction to Italy on 2002. P. quercivorus, a vector of pathogenic fungus Raffealea quercivora was responsible for Japanese Oak wilt disease on Q. crispula and Q. serrata. In this study, we will introduce the current status of oak wilt disease in Korea and integrated control method of this disease

Bark beetles are recently considered as important forest insect pests in several countries. Damage of bark beetles has increased in Korea, and monitoring of these beetles become important. However, there has been no study on development of monitoring skill on bark beetles in Korea. In this study, we tested the attractiveness of (-)-α-pinene, ethanol, (-)-α-pinene+ethanol for monitoring of bark beetles. Some bark beetles strongly attracted to (-)-α-pinene or (-)-α-pinene+ethanol. Some ambrosia beetles strongly attracted to ethanol. Our results indicated that (-)-α-pinene, ethanol, or (-)-α-pinene+ethanol could be useful infochemicals for the monitoring of bark beetles.

 ,  , The larvicidal activities of Piper nigrum fruit methanol extracts and its constituents against larvae of the diamondback moth, Plutella xylostella, were investigated using the leaf dipping method. Administering the P. nigrum methanol extract resulted in 100 and 97% mortality against diamondback moth larvae at 5.0 and 2.5 mg/mL concentrations, respectively. Larvicidal activities of the P. nigrum fruit-derived piperidine alkaloids, piperine, and N-isobutylamide, as well as pellitorine, guineensine, pipercide, and retrofractamide A against P. xylostella varied according to test compound. Based on the 48 h LC50 values, the most toxic compound to diamondback moth larvae was guineensine (0.013 mg/mL) followed by retrofractamide A (0.020mg/mL), pipercide (0.033mg/mL), and pellitorine (0.046 mg/mL). The LC50 value of piperine was >, 0.5 mg/mL.

Mass mortality of oak trees has been reported at Sungnam city, Gyeonggi province, Korea in 2004, and spread to several areas of Korean peninsula. It seemed to be occurred by a possible pathogenic fungus Raffaelea sp. spread by an ambrosia beetle, Platypus koryoensis (Coleoptera: Platypodidae). P. koryoensis massively attacked healthy or stressed living Quercus mongolica. The numbers of damaged or died Q. mongolica by oak wilt disease has increased annually since its first report. Here, we introduce control methods recently developed for the control of this disease.

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.