(接上期 )一、分布与危害马铃薯早疫病(potato early blight)也称轮纹病,是马铃薯生产上最常见的真菌病害之一,属世界性分布病害,一般可减产10%左右,在发生严重的地块产量损失率达30%以上;严重时全株枯死,产量降低,更严重者甚至个别地块绝收。自2000年以来我国河北、内蒙古、黑龙江、甘肃、宁夏和山东 (Continued) I. Distribution and Harms Potato early blight, also known as ring blight, is one of the most common fungal diseases in potato production and is a worldwide disease with a yield reduction of about 10%. When it occurs Serious land yield loss rate of 30% or more; serious when the whole plant withered, lower production, more serious or even a few plots. Since 2000, China’s Hebei, Inner Mongolia, Heilongjiang, Gansu, Ningxia and Shandong