I have two grown maple trees that I just discovered to be infested with ants. Ants seem to be crawling up and down the tree constantly. But the trees look healthy otherwise; should I be worried and should I be killing the ants? Thanks!
Bleeding happens in the spring so I presume that is what the ants are going for so I wouldn't worry unless they find themselves in your house.
Here is a link that might be useful: Propagating Perennials
You likely have some sort of honeydew-producing insect in the tree. The most common is aphids. But may also be scale.