马铃薯是重要的粮食作物,增产潜力大,对保障我国的粮食安全具有重要的意义。然而,由于连作问题,各种病害日益突出,鉴定和认识新的病害问题是其有效防控的基础,有助于马铃薯的可持续生产。2009～2010年在甘肃省定西全市各县区马铃薯病害的田间普查中,发现了能够造成马铃薯早死的一种新病害,通过病菌分离和鉴定,确认了大 Potato is an important food crop with great potential for increasing production and is of great significance for ensuring food security in our country. However, due to the continuous cropping problems and the increasing prominence of various diseases, the identification and recognition of new diseases are the basis for effective prevention and control and contribute to the sustainable production of potatoes. In the field survey of potato diseases in counties and districts of Dingxi City, Gansu Province from 2009 to 2010, a new disease that could cause premature death of the potato was found. Through the isolation and identification of the bacteria, large