1．玉米种子①赤霉病，病种粒表皮被红色或粉红色丝状物包围、种粒发芽时常长出微黄色及粉红色的菌丝体。③圆斑病。籽粒和果穗轴呈黑色，籽粒黑腐于缩，一般果穗中部或顶尖受害，病部凹陷，果穗弯曲，籽粒年满黑色霉层。③于腐病。病粒外部呈褐色或黑色，病粒缩小、干腐，发芽 1. Maize seeds ① Fusarium head blight, the diseased seed epidermis is surrounded by red or pink filaments, the seed germination often grow yellowish and pink mycelium. ③ spot disease. The grain and the axis of the ear are black, the grain is rotten in black, the central or top ear of a common ear is damaged, the diseased part is concave, the ear is curved, and the grain is full of black moldy layer. ③ in the rot. Patient outside was brown or black, narrow particles, dry rot, germination