What is the green sapped stick in the man and the sea?

In Ernest Hemingway's "The Old Man and the Sea," the green sapped stick refers to the mast of the old man's skiff, which symbolizes strength and resilience despite its age and wear. The green sap indicates life and vitality, contrasting with the struggles and hardships the old man faces during his fishing expedition. This imagery underscores themes of perseverance and the connection between nature and the human spirit.