Spodoptera litura (Fabricius, 1775) is considered as a serious agricultural pest, which damaged to the many crops including sweet potato (Ipomoea batatas). We investigated weekly occurrence of the Spodoptera litura (Fabricius) using pheromone trap at six study fields of three regions, Jeonnam, Korea. A total of 41,895 individuals were collected from 18th July to 23th September in 2013; Yeongamgun was collected the highest individuals (17,519), and following the Muan-gun (12,709) and Haenamgun (11,667). The seasonal occurrence of S. Litura was increased from July to September, and peak occurrence timing was in late-September. There were a positive correlation between field area and number of individuals (P=0.02, r=0.89), and a negative correlation between field area and density (p=0.02, r=-0.89). As a PCA (principal component analysis) result, adults occurrence pattern were closely related to the temperature and relative humidity during larva stage.

• 양정욱(국립식량과학원 바이오에너지작물연구소) | Jung-Wook Yang (Bioenergy Crop research institute, National Institute of Crop Science, RDA. Muan, Jellanam-do, 58545 Korea) Corresponding author
• 안정섭(국립생태원 전시교육기획부) | Jeong-Seop An (Department of Exhibition and Education Planning, National Institute of Ecology, Seocheon, Chungcheongnam-do, 33657 Korea)
• 이형운(국립식량과학원 바이오에너지작물연구소) | Hyeong-Un Lee (Bioenergy Crop research institute, National Institute of Crop Science, RDA. Muan, Jellanam-do, 58545 Korea)
• 정미남(농촌진흥청) | Mi-Nam Chung (Rural development Administration, Jun-ju, Jellabuk-do, 54875 Korea)
• 이준설(국립식량과학원 바이오에너지작물연구소) | Joon-Seol Lee (Bioenergy Crop research institute, National Institute of Crop Science, RDA. Muan, Jellanam-do, 58545 Korea)
• 한선경(농촌진흥청) | Seon-Kyeong Han (Rural development Administration, Jun-ju, Jellabuk-do, 54875 Korea)
• 안승현(국립식량과학원 작물재배생리과) | Seung-Hyun Ahn (National Institute of Crop Science, Wanju, Jellabuk-do, 55365 Korea)