谷子白发病(俗称看谷老)①表现症状:在田间主要表现为灰背、白尖、枪杆、白发、谷老等症状。谷子幼芽受害,变色扭曲,甚至腐烂死亡;3片叶到抽穗前,病叶下面出现黄白色条斑,叶背面生灰白色霉状物,称“灰背”;叶片变为黄白色,称“白尖”;后变成褐色有时病叶不能展开呈“枪”状,甚至扭折卷曲呈旋心状,最后叶 Mildew white hair disease (commonly known as GuGulao) ① symptoms: the main performance in the field gray back, white tip, gun, white hair, Valley and other symptoms. Millet shoot damage, discoloration distorted, and even rotten death; 3 leaves before heading, diseased leaves appear yellowish-white streaks, gray back and white mildew, called “gray back”; leaves turn yellow-white, Called “white sharp ”; After turning brown, diseased leaves sometimes can not be “gun” shape, and even twists and turns were curled, the last leaf