Phytophthora and Pythium are a group of Oomycetes that widely associated with diseases in potato plants. Therefore, this study was conducted to identify the rhizosphere infected plants showing leaf blight. Four isolates were collected from four regions Central Java (UGM_St_TM, UGM_St_BK, UGM_St_BNJ, UGM_St_KJ, isolate Temanggung, Bakal, Banjarnegara, Kejajar respectively), UGM_St_NG as culture ...