葡萄白粉病在大多数葡萄栽培地区均有发生。其中以山东、河北发生较重,影响葡萄的产量和质量。 1 发生症状 葡萄白粉病可以侵染葡萄的叶片、新梢及幼嫩组织。叶片发病时,最初在叶片表面形成白粉质的斑块,以后病斑变为灰白色。病斑轮廓不整齐,大小不等,整个叶片布满白粉,病叶卷缩枯萎、脱落。果实发病时,首先褪绿斑上出现黑色 Grape powdery mildew occurs in most viticulture areas. Among them, Shandong and Hebei occurred heavier, affecting the yield and quality of grapes. 1 Symptoms Grape powdery mildew can invade the leaves, shoots and young tissues of grapes. At the onset of the leaf blade, a white powdery plaque was initially formed on the surface of the leaf, and later the lesion turned gray-white. Spot outline irregular, ranging in size, the entire leaves covered with white powder, sick leaves crimp shrink, fall off. Fruit onset, the first green spot on the appearance of black