Abstract: 【Objective】 To isolate and identify the pathogen causing potato black scurf in Xinjiang in the hope of providing a foundation for screening of control agents and establishment of control technology. 【Methods】 Potato tubers were collected from Jimsar, Qitai, Dabancheng and Zhaosu in Xinjiang, and Rhizoctonia solaniwere isolated from tubers with potato black scurf by tissue separation method. Anastomosis groups of Rhizoctonia solaniwere identified by paired culture and ITS sequence analysis. 【Results】 The four strains isolated from Jimsar, Qitai, Dabancheng and Zhaosu were all able to cause the symptoms of potato black scurf on potato tubers. The isolated strains were Anastomosis groups AG3. 【Conclusion】 Anastomosis Groups AG3 is the main pathogenic group of potato black scurf in Xinjiang.