The spring emergence of individual insect would be influenced by surface temperature during winter season. The oriental fruit moth, Grapholita molesta, overwinter as a full-grown larva within spherical and compactly woven cocoons in the clefts of tree bark. It consume new shoots early and fruits later in the growing season. To estimate the spring emergence of G. molesta, we used the lower developmental threshold (8.14°C) and thermal constant (279.3) for overwintering G. molesta. The climate data were obtained from the web site of the Korea Meterological Administration(KMA) from 1975 to 2015 at 61 locations, respectively. The spring emergence of G. molesta was changed depending on ambient temperature of each year.

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