随着我区甜菜种植时间的增长,甜菜黑脚病、白粉病、根腐病等病害发生日趋严重。一、黑脚病1.发病症状从种子萌发到2～3对真叶前均可发病,4对真叶后病害即停止扩展。其症状大致可分为两类,出土前被侵染造成烂种烂芽,或幼苗出土后发病,在子叶 With the increase of sugar beet planting time in our region, diseases such as black-footed beet disease, powdery mildew and root rot occur more and more serious. First, black-legged disease 1. Morphological symptoms from seed germination to 2 to 3 pairs of true leaf can be onset, 4 pairs of true leaf disease that stop expanding. The symptoms can be broadly divided into two categories, before being unearthed caused by rotten rotten buds, or seedlings disease after emergence, cotyledons