The disease investigation was made from May in 2008 to May in 2009 in the storage time in Chayouqian flag,Zhangbei County,Jining area,Datong city,Wuchuan County,Zuoyun County,Youyu County of huabei area.The sample was collected,the Pathogen on sample were isolated,purified and identified.Four fungi disease and three bacteria disease of potato were found in Huabei area including dry rot,Rhizoctonia canker,late blight and early blight,soft rot,Ring rot and potato scab.Four species pathogens of potato dry rot ...