谷子白发病(看谷老)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“枪杆”状,甚至扭折卷曲呈旋心状,最后叶片组织分裂为细丝,散出 Mildew white hair disease (see valley old) performance symptoms in the field mainly as “gray back, white tip, gun, white hair, Valley old ” 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-pointed ”; after turning brown to diseased leaf sometimes can not be “gun” shape, and even twists and turns curly heart-shaped, and finally leaves the tissue split into filaments, scattered