莜麦红叶病是蚜虫传播的大麦黄矮病毒引起的,与小麦黄矮病是同一病源。一、识别病叶自叶尖沿叶缘向内向叶基渐褪绿变紫,后期从叶尖向叶基变成土黄色枯死,叶鞘变紫。少数叶片先在蚜虫刺吸部位表现红色斑驳,有的褪绿变黄再变紫,有的变黄后不再变紫。多数叶片的叶脉较脉间组织变色快,早期形成紫绿或紫黄相间的条纹状。一般叶背显症早于叶正面,病叶较健叶增厚、变硬,手摸叶正面有叶脉条纹凸起的粗糙感觉。整株的症状表现是,被蚜虫刺吸的 Barley red leaf disease is caused by aphid-borne barley yellow dwarf virus and is the same source of wheat yellow dwarf disease. First, the identification of diseased leaves from the leaf edge along the leaf margin gradually into the leaf base gradually faded green purple, the late leaves from the leaves into a khaki dead, leaf sheath purple. A small number of leaves in the aphrodisiac thorn area showed red mottled, and some pale yellow and then purple, yellowing after some no longer become purple. The majority of leaf veins color faster than the inter-venous tissue, the early formation of purple green or purple and white stripes. General leaf back symptoms than the front of the leaves, diseased leaves more thicker than the healthy leaves, hardening, hand touching the leaf veins raised veins a rough feeling. The symptom of the whole plant is that it is sucked by aphids