Crab apple tree has yellow withered leaves
I have a tree in the middle of my yard which I think is a crab apple tree, but I'm not 100% sure. It has red cranberry like ornamental fruit in the winter and has pink/white blossoms in the spring. Usually in the summer it maintains its green leaves. However, this summer all of the leaves have withered and turned yellow and the berries have dried up as well. Any ideas what could be wrong with my tree and what I can do to help it.
Here is a link that might be useful: