一、发病症状马铃薯环腐病一般在马铃薯花期之后发生,发病初期,叶脉间褪绿,呈斑驳状,逐渐变黄、变枯。叶片边缘变黄变枯,并向上翻卷。发病一般从植株下部叶片开始,向上发展到全株。在不同环境条件下,不同品种有不同症状:①植株出现矮缩、瘦弱,分枝少,叶小发黄,萎蔫症状不明显。②植株急性萎蔫,叶片呈灰绿色并向内卷曲,植株提前枯死。感病植株基部茎维 First, the onset symptoms Potato ring rot generally occurs after the flowering of potato, early onset, chlorotic veins, mottled, gradually turn yellow, become dry. The edges of the leaves turn yellow and become withered, turning upwards. The incidence of the general plant from the lower leaves, upward development to the whole plant. In different environmental conditions, different varieties have different symptoms: ① plants dwarfed, thin, less branching, leaves small yellow, wilting symptoms are not obvious. Plants acute wilting, the leaves were gray-green and curled inward, the plants died in advance. Stem plant stem stem dimension