Potato late blight caused by the fungus Phytophthora infestans is one of the most important diseases worldwide. Developing potatoes with resistance to late blight through breeding programs is a key research interest in Korea. ‘Mangang’ was bred for late blight resistance through a breeding program at the Highland Agriculture Research Institute of National Institute of Crop Science. The population derived from the cross between ‘Atlantic’ as the female parent, which has excellent chipping quality and ‘CIP393371.159’ as the male parent, a late blight-resistant clone introduced from International Potato Center (CIP), was selected. In ‘Mangang’, the plant maturity occurs late and the growth habit is of the erect type. The tuber shape is round and eye-depth is medium. The skin color of ‘Mangang’ is light yellow; however, there are pink spots around the eyes of the tuber, and the flesh color is white. Leaf color is green and flower color is light-purple. ‘Mangang’ exhibits resistance to early blight (Alternaria solani) and leaf roll virus (PLRV). In addition, it has moderate resistance to common scab (Streptomyces scabies). The response to late blight was evaluated in a non-agrochemical treated field for five years between 2012 and 2016; ‘Mangang’ exhibited resistance to late blight. The mean AUDPC (Area Under Disease Progress Curve) values of ‘Mangang’ and ‘Atlantic’ were 165.5 and 795.8, respectively. Total tuber yield from the non-agrochemical application trial at three regions during the five years was 40.3 ton/ha; this was 40.4% higher than that from ‘Atlantic’. The dry matter content of ‘Mangang’ was 21.3%, which was slightly higher than that of ‘Atlantic’. The chip color was 66.5, and the chip processing quality of ‘Mangang’ was at a level similar to that of ‘Atlantic’ (Registration No. 9312).

A new double cropping potato variety, ‘Gangseon’, was bred by the Highland Agriculture Research Institute, National Institute of Crop Science (NICS), RDA, Korea, in 2016. ‘Gangseon’ was obtained from the cross between ‘Daegwan1-83’ and ‘Chubaek’ in 2006. Seedling and line selection was performed from 2008 to 2009, and preliminary and advanced yield trials were carried out with ‘Gangseon’ from 2010 to 2013 in Gangneung city. The regional yield trials were conducted in Gangneung, Muan, and Jeju from 2014 to 2016. ‘Gangseon’ has light purple flowers, green narrow leaflets and petioles with medium anthocyanin coloration, round tubers with yellow russet skin, and yellow flesh. The dormancy of ‘Gangseon’ stored in 20 ℃ was 60-70 days after harvesting, which is longer than those of ‘Dejima’ and ‘Chubaek’, but shorter than that of ‘Superior’. The average yields of tubers in the spring and fall seasons were 36.6 and 21.2 ton⋅ha^-1, respectively, in the regional yield trials. It is susceptible to common scab and potato virus Y, but has high resistance to potato leaf roll virus, potato virus X, early blight, and late blight. The dry matter contents were 22.1% in spring and 19.8% in autumn. The adaptation area of ‘Gangseon’ is the southern coastal area, including Jeju Island, Korea. The plant variety protection right of ‘Gangseon’ was registered in April 2020, and its grant number is 8081.