玉米品种在苗期不同程度地出现黄苗现象,很大地影响玉米的生长发育导致玉米产量,不同程度地降低严重地块减产10%-20%以上。其主要症状,幼苗叶片发黄变薄、根系不发达、根毛少,有的主根上有褐斑、根系变褐、苗弱小、生长缓慢。发病的原因及防治方法:地块低洼积水造成的玉米黄苗。玉 Maize varieties appeared yellow seedlings to varying degrees in the seedling stage, which greatly affected the growth and development of maize and led to the yield of maize. The yield of maize was reduced by more than 10% -20% in different degrees. The main symptoms of seedling leaves yellow thinning, underdeveloped root hair less, some main root brown spots, brown roots, weak seedlings, slow growth. The cause of the disease and prevention methods: the plot of low-lying water caused corn yellow seedlings. jade