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1993年以来,我们在成都市郊锦江区、龙泉驿区等地的葡萄园中,相继发现不少植株上有明显的的扇叶病症状,发病株率为5—20％左右,严重地块的发病率高达100％。此病的主要症状表现是:新叶卷曲,叶背被满白色长绒毛;逐渐展开后叶片因主叶脉聚合而似蒲扇状,叶片仅为正常叶的1/3—1/4,叶小而畸形;叶缘缺刻加深,有的缺刻深达10厘米以上,造成叶缘尖细呈须状,有的叶缘上还形成丛生状“小叶”;不少病叶还表现花叶和斑驳,伴有深绿色泡斑,致使叶面凹凸不平。将上述典型病叶进行电镜制片观察,发现有大量球状病毒粒体,直径约为30毫微米,将病叶的汁
Since 1993, we have found many plants in the Jinjiang District, Longquanyi District and other places in Chengdu, there are obvious symptoms of leaf-blade disease, the incidence of about 5-20% of the plant, the incidence of a serious block Rate up to 100%. The main symptoms of the disease are: curly new leaves, the leaves are covered with white long villi; gradually expanded after the main vein polymerization and like a palm-shaped fan, leaves only normal leaves 1 / 3-1 / 4, leaves small Deformity; leaf edge deepening deepening, and some notches depth of 10 cm or more, resulting in leaf tip pointed was whisker, and some leaf margin also formed clusters of “small leaf”; many sick leaves also showed mosaic and mottle, with Dark green bubble spots, resulting in uneven foliage. The typical diseased leaves were observed by electron microscopy and found that a large number of globular virus particles, a diameter of about 30 nm, the diseased leaf juice