一、发病症状 主要发生在葡萄根颈及近根部的2年生以上老蔓上。5月上旬开始发病,病部形成似愈伤组织状瘤.呈绿色,手掐松软,以后随树体生长.瘤逐渐长大,顶破皮层并木质化.此时瘤体呈深褐色。受害植株病部呈披麻状.树势衰弱,叶片变小。麦收前夕叶片变黄。发病植株坐果率低,果穗小,果粒稀疏且不整齐,个别植株果粒呈黄色透明状。7、8月份进入发病高峰 First, the onset of symptoms occurred mainly in the root of the root and near the roots of 2 years old manor. In early May, the disease started to develop, and the diseased part appeared to be callus-like tumor, showing a green color with pinch-soft hands and later growing with the tree. The diseased part of the diseased plant is in the shape of a hemp, and the shrubs weaken and the leaves become smaller. Wheat harvest leaves turn yellow. The incidence of plant fruit setting is low, small ears, fruit sparse and irregular, individual plant yellow transparent fruit. July and August entered the peak incidence