葡萄叶片青枯病多为突然间大面积发生。该病外观颜色变化与白腐病有点相似，叶片边缘初呈水渍状暗绿色青枯，１天后病部呈黄褐色，并由外向内又出现一圈暗绿色青枯，即使是在土壤含水量没有达到凋萎系数的情况下也会出现青枯现象。如不遇雨又不浇水，病害将迅速蔓延，严重时整 Grape leaves bacterial wilt mostly suddenly occurred in large areas. The appearance of the disease color change and white rot is a bit similar to the beginning of the edge of the leaves were water-like greenish brown withered, 1 day after the disease was brown, and outward from the emergence of a circle dark green withered, even in the soil with Wither does not reach the wilting coefficient of the case will appear withering phenomenon. If it is not rain or watering, the disease will spread rapidly and will be severe