I have a maple tree that is approximately 43 years old. A few years ago the bark started to get black. I was told to remove the yew that was growing around the tree. In some areas the bark has fallen off. The tree was pruned last year. It has foliage & appears to be health except for the black bark & bare trunk. I don’t want this tree to fall over in a big storm
Read through these guidelines for when to remove a tree: http://extension.umd.edu/learn/how-do-you-decide-when-remove-tree
Your tree looks like the damage extends about 1/2 way around the trunk. The guidelines suggest 1/4 trunk circumference is the limit.