The common corn rust caused by Puccinia sorghi Schw. is widely distributed southern regions of temperate zones and sub-tropical regions world wide. It has been reduced corn yield significantly in Texas and Hawaii. The first author has observed incidence of this disease in Korea since ten years ago both in South (Kunwi, Ilsan, Pyungchang) and North Korea (Tongcheon). P. sorghi had very high infection in Jeju Island with over 2000 mm rainfall in 2008 on commercial hybrids from USA (DK 729, Pioneer 3394, P32P75) and Korea. All showed high susceptibility. Genetic tolerance could be the most economic way to control these fungi. The occurrence of this disease in Korea may be caused by environment changes. Pro-environment tolerance breeding with quantitatively inherited genes of host crop can guarantee for the durability and sustainability of crop cultivars under continuous changes of weather and environments.

• Soon-Kwon Kim(International Agricultural Research Institute, Kyungpook National University)
• Ji-Yong Yoon(International Agricultural Research Institute, Kyungpook National University)
• Claudino Ninas Nabais(International Agricultural Research Institute, Kyungpook National University)
• Shin-Gu Kang(International Agricultural Research Institute, Kyungpook National University)
• Win Win Nwe(International Agricultural Research Institute, Kyungpook National University)