Previous laboratory repellent assessment with three plant essential oils against Haemaphysalis longicornis, a major vector for Severe fever with thrombocytopenia syndrome, revealed high repellency of Lavendual angustifolia and high synergic effects of Cinnamomum zeylinicam and Juniperus verginiana. Based on the previous laboratory repellent assessment field studies on repellency of the three plant oils were carried out with formulations such as cream type and spray type. 10% spray type of Cinnamomum zeylinicam demonstrated > 70% of repellency against H. longicornis. 10% spray type of Lavendual angustifolia showed > 80% of repellency. 10% spray type of binary mixture containing Cinnnamomum zeylinicam and Juniperus verginiana showed > 98% repellency against H. longicornis. Further studies on repellency of cream type of the plant oils might be carried out and compared with two commercial repellents.

• Gi-Hun Kim(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)
• Jin Hwan Jeon(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)
• Chang won Jang(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)
• Se Jin Jeong(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)
• E-Hyun Shin(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)
• Young-Ran Ju(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)
• Kyu-Sik Chang(Division of Medical Entomology, Center for Immunology and Pathology, NRIH, KCDC)