The walking-stick insects, Ramulus mikado, are outbreaks in several mountainous areas from 2020 to 2022. In recent, some population of the insect are showed rapidly decline in their abundance, while some of them are still maintained high population density. In worldwide, insects belonging to Phasmida are reported to outbreak in their habitats as mentioned above environments, but knowledge about outbreak pattern of the walking-stick insects is still lacking. In this study, we aimed which biological and environmental factors are related to wax and wane of the insect population. From 2022 to 2023, we studied host tree preferences in natural conditions, ecological stoichiometry in major host trees, overwintering ecology of R. mikado eggs, and infection rate by entomophathogenic fungi during growing season.

• Jong-Kook Jung(Department of Forest Environment Protection, Kangwon National University, Chuncheon, Republic of Korea)
• Seul-Ki Son(Department of Forest Environment Protection, Kangwon National University, Chuncheon, Republic of Korea)
• Dong Gyu Min(Department of Forest Environment Protection, Kangwon National University, Chuncheon, Republic of Korea)
• Min Jeong Baek(National Institute of Biological Resources, Incheon 22689, Republic of Korea)
• Sun-Jae Park(National Institute of Biological Resources, Incheon 22689, Republic of Korea)