苹果圆斑根腐病有严重发生的趋势苹果圆斑根腐病地上症状有：萎蔫型、青干型、叶缘焦枯型３种，苹果幼树园主要是焦枯型，即群众称病树为“小老树”。病树根部发病先是须根变褐枯死，然后延及肉质根，围绕须根的基部在肉根上形成一个红褐色的圆斑，随着病斑的扩大，互相愈... Apple round root rot has a serious trend Apple ground round root rot symptoms of the ground are: wilting type, green stem type, leaf margin scorch type 3, apple seedling is mainly scorched, that the masses said the tree is “ Little old tree. ” Diseases of the diseased root cause the browning of the fibrous roots and then the fleshy root, forming a reddish brown circular spot around the base of the fibrous roots. As the lesion expands, the more each other ...