Tulip tree is this canker? How to treat ?

This was a free tulip tree from the city planted on my front last. Wind blows from west often and bends tree a little to the east. It had been planted on my lawn about 5 years? I just noticed…

Tulip tree

We live in the city of Toronto. We have a tulip tree in our back yard. It is planted in partial sun. Every year, the leaves turn yellow with dark brown spots and end up falling off the tree. I…