More than likely, Hypoxylon Canker- Oak Wilt is very scarce around here...
This is the general first symptoms of Hypoxylon Canker- Oak Wilt tends to spread by Root connections- there isn't another tree close enough to spread this disease. Hypoxylon canker would be my guess- Stress induced- Just look at the base of the tree- it has a mound of mulch- this has caused root suckers to develop because of stress.
Just my .02 sense!
:chainsawguy:
Adam