As singingqwoodwach says:
All that Ivy will eventually kill the tree.
I tell people quite often and it usually falls on deaf ears so I only say it once.
I do not say I told you so when they call me to take out their dead tree, I just collect my pay and move on.
I've seen it eventually kill very large trees. (like a slow cancer)
Usually happens so slow that people do not even notice until it's too late.
Usually if a tree still looks healthy you can cut the vine's stalks/runners at the bottom of the tree. Sometimes you may have to do this yearly until you get all killed out. Best to not use a herbicide on the vines roots or it can harm the tree.Most generally if the tree is sick and already dying it's a goner. Take out about 4 inches of the vine's stalk and the uppers of the vines will die and the tree will start smiling again. If it's poison Oak or Ivy do not hug the tree for awhile Most generally can use limb lobbers on the vines stalks and not have to even touch the stalks runners.