白粉病是我国华北地区主要的葡萄病害之一,该病主要危害葡萄的果粒、叶片、新梢及卷须等绿色幼嫩组织,以果实受损最大。叶片受害时,最初在叶面上产生细小的、淡白色的霉斑,以后逐渐扩大成灰白色粉末状,致使病叶卷缩枯萎。果实受害时在果面产生粉状霉层,擦去霉层后,果面 Powdery mildew is one of the major grape diseases in North China. The disease mainly damages the green young tissues such as fruit grains, leaves, shoots and tendrils of grape, and the fruit is most damaged. Leaves damage, the first leaves in the surface to produce small, pale mildew, and later gradually expanded into an off-white powder, resulting in diseased leaves crimp wither. Fruit damage occurs in the fruit powdery mildew layer, wipe the mold layer, the fruit surface