The soybean bug, Riptortus pedestris, is a polyphagous species and an important pest of soybean. We investigated the development periods and survivorship of R. pedestris egg and nymph stage. The study was conducted at eleven constant temperatures of 12, 14, 16, 18, 20, 24, 28, 32, 34, 35, and 36℃, respectively. Egg could not hatch under 14℃. Nymph could not develop to adult at 16℃. The lower developmental threshold (LDT) and thermal constant (K) of R. pedestris nymph stage were estimated by linear regression. Higher temperature threshold (TH) and lower temperature threshold (TL) were calculated by two nonlinear functions (Performance and SSI model). The adult emergence frequency of R. pedestris over full range of constant temperatures was simulated using developmental rate functions and Weibull function.

• Jeong Joon Ahn(Research Institute of Climate Change and Agriculture, National Institute of Horticultural and Herbal Science, RDA, Jeju)
• Kyoung San Choi(Research Institute of Climate Change and Agriculture, National Institute of Horticultural and Herbal Science, RDA, Jeju)
• Sang Wook Kho(Research Institute of Climate Change and Agriculture, National Institute of Horticultural and Herbal Science, RDA, Jeju)