1. Apple Research Institute, National Institute of Horticulture and Herbal Science, Rural Development Administration, Gunwi 39000, Korea
2. Plant Variety Protection Division, Korea Seed and Variety Service, Gimcheon 39660, Korea
3. Extension Planning Division, Gyeongsangbuk-do Agricultural Research and Extension Services, Daegu 41404, Korea
4. Institute of Life and Environment, Daegu University, Gyeongsan 38453, Korea