一、玉米种子1．赤霉病。病粒表皮被红色丝状物包围，种粒发芽长出微黄色的菌丝体。2．圆斑病。病穗的籽粒和果德轴呈黑色，籽粒黑腐干缩，一般果穗中部或顶尖受害，病部凹陷，果穗弯曲，籽粒长满黑色霉层。3．干腐病。病粒外部呈褐色或黑色，病粒缩小，于腐，发芽时有白色霉状 First, corn seeds Fusarium head blight. Epidermis surrounded by red filaments, seed germination grow yellowish mycelium. 2. Circular spot disease. The ear of the grain and the axis of the fruit is black, dry black kernels shrink, the general damage to the central or top ears, diseased parts, ear bending, grain covered with black mold layer. 3. Dry rot. Patient outside was brown or black, narrowing of the lesion in the rot, sprouting white moldy