Phellogen layer structure was seen inside the pedicel wart of all cultivars observed but Red globe.Fungi mycelium was also observed in the pedicel wart of all cultivars except Beichun.

• 发现抗性较强的北醇，小果柄上的疣小、形成较早，发育速度较慢，破裂后内部结构层次清晰，基部木栓形成层明显，抗性差的红地球则相反。