1．玉米种子赤霉病病粒表皮被红色或粉红色丝状物包围，种粒发芽时常长出徽黄色及粉红色的菌丝体。国斑病病穗的籽粒和果德轴呈黑色，籽粒黑腐干缩，一般果稳中部或顶尖受害，病部凹陷，果德弯曲，籽粒长满黑色零层。于腐病病粒外部呈褐色或黑褐色，病粒缩小，于腐，发芽时有白 1. Scab of corn seedlings Epidermis is surrounded by red or pink filaments, the seeds often grow yellow and pink mycelium germination. National spot disease ear grain and fruit axis is black, dry black kernel shrinkage, the general stability of the central or top victims, diseased parts, fruit Germany curved, covered with black grains zero. In the rot outside the grain was brown or dark brown, narrowing of the lesion in the rot, when germination white