Grapholita dimorpha is a new pest of apple, pear and plum in Japan and Korea as well. Although G. dimorpha was reported as a multi-voltine insect with four generations per year, the phenology is not fully known in Korea. We present a model to predict the spring occurrence of G. dimorpha adults based on the relationship between the cumulative proportion of G. dimorpha adult catches and accumulated degree-days. Five different distribution models were applied and the selection was made based on the statistical information criteria (AICC and BIC). Model validation was performed with the field data of the male moth catches in sex pheromone-baited traps of two apple production regions (Chungju and Geochang) of Korea in 2011. Model predictions of the dates for the cumulative 50% male moth catches were within five days variation. Because G. dimorpha has a feeding habit of boring inside the fruit the management practice of G. dimorpha should apply on egg and neonate larval stage. The management strategy of G. dimorpha in spring might be improved by the model.

• Jeong Joon Ahn(Plant medicine major, School of bioresource sciences, Andong National University)
• Lalit Prasad Sah(Plant medicine major, School of bioresource sciences, Andong National University)
• Seon Ah Jeong(Plant medicine major, School of bioresource sciences, Andong National University)
• Chuleui Jung(Plant medicine major, School of bioresource sciences, Andong National University)