白粉病是大棚草莓常见的一种病害,该病侵染草莓植株的叶片、叶柄、花、果实。发病初期,叶背面零星长出薄薄的白色菌丝层,随着病情加重,白色菌丝层增厚,整个叶片被白粉状霉层覆盖,叶缘向上卷曲变形,叶质变脆,叶柄上也覆盖着白粉状霉层;花蕾受害,不能开放或开花不正常;果实受害则 Powdery mildew is a common disease in strawberry greenhouses that infect the leaves, petioles, flowers and fruits of strawberry plants. Early onset, sporadic leaf sporadic thin white hypha layer, with the aggravation of the white mycelial layer thickening, the entire leaf is covered by white mold mildew, leaf curl upward deformation, leaf texture becomes brittle, petiole Also covered with powdery mildew layer; buds victims, can not be open or flowering is not normal; fruit damage then