Spodoptera species (S. exigua and S. litura) are important pests of several crops and vegetables in Korea. We investigated development processes of Spodoptera species under constant temperatures (20, 25 and 30 oC) regimes and relative humidity (RH) (30-35, 50-55, 70-75, and 90-95%) conditions. We collected eggs of Spodoptera species by releasing them into a rectangular box inner walls covered with a sheet of white paper. Temperature and RH significantly impacted on oviposition, immature survival, adult emergence and longevity of Spodoptera species. Maximum number of eggs, shorter developmental time, higher adult emergence with longer longevity were reported in 70-75% at 30 oC. Minimal eggs and larval survival were recorded in 30-35% and 90-95% RH, respectively. This results suggest that temperature and RH had individual apparent effect on the developmental processes of Spodoptera species instead interactive effect. Therefore, there is chance to cause a significant damage to field crops and vegetables in 70-75% at 30 oC.

• Rameswor Maharjan(Crop Production Technology Research Division, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea) Corresponding author
• Seoyeon Hong(Crop Production Technology Research Division, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea)
• Youngnam Yoon(Crop Production Technology Research Division, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea)
• Yunwoo Jang(Crop Production Technology Research Division, National Institute of Crop Science, Rural Development Administration, 50424 Miryang, Republic of Korea)