I have a young maple tree in our yard that is missing roughly 30% of its leaves (they didn't drop, they just never sprouted in the spring. The bark appears to be unhealthy and separating in places from the trunk, and many of the remaining leaves have brown spots/holes in them. Some of the leaves appear to be changing color early (mid august now). I have given the tree no extra care, other than a mid-spring mulching around the base (I was careful to keep the trunk clear of mulch at ground level). I am attaching a photo. Any assistance is appreciated. I'm concerned that whatever is stressing this tree will eventually kill it. Thanks in advance!