玉米顶腐病的发生目前呈上升趋势,危害损失重,潜在危险性高,具体症状表现为单果穗小,籽粒不饱满。玉米顶腐病可在玉米整个生长期侵染发病,表现出不同症状。苗期侵染,表现为植株生长缓慢,叶片边缘失绿、呈现黄条斑,叶片畸形、皱缩或扭曲,重病植株枯萎或死亡;植株生长中、后期,叶基部腐烂、仅存主脉,中上部完整但多畸形,以后长出的新叶顶端腐烂,导致叶片短小、叶尖枯死或残缺不全,叶片边缘常出现似刀削状的缺刻和黄化条纹。成株期感病,植 At present, the occurrence of corn top rot is on the rise, the damage is heavy and the potential risk is high. The specific symptoms are as follows: the single ear is small and the grain is not full. Corn top rot can infect the corn throughout the growing season, showing different symptoms. Seedling infection, the performance of slow plant growth, leaf edge green, yellow patches, leaf deformity, shrinkage or distortion, seriously wilt or death plants; plant growth, the late leaf base decay, only the main artery, In the upper part of a complete but more deformity, after the growth of the new tip of the top decay, resulting in short leaves, withered leaves or incomplete, leaf edges often appear like knife-like nicks and yellow stripes. Adult susceptible, plant