一、玉米种子 1.赤霉病。带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。 2.圆斑病。籽粒和果穗轴呈黑色,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,干腐,发 First, corn seeds 1. Scab. The diseased seed epidermis is surrounded by red or pink filaments. Seed germination often grow yellowish and pink mycelium. 2 spot disease. The grain and the axis of the ear are black, the grains are black-rotted, the central or top ear of the ear is damaged, the diseased part of the ear is buckled, the ear is curved, and the grain is covered with black mold layer. 3. Dry rot. Particles were brown or black outside the particles narrowing, dry rot, hair