I found some sap, below the graft, leaking from near the base of my apricot tree. It is on Myro. The sap seemed clean and didn’t smell sour. Where the sap was coming from looked like a pruning scar from when the advice was to cut the branch flush with the trunk. (Hopefully that makes sense.). However, I did not notice any suckers coming from the rootstock prior to this.
I do not notice any blackness or overgrowth or any signs of tree disease. In fact, outside of some insects chewing holes in some of the leaves, the tree looks pristine and very healthy.
Also, I found this while inspecting my trees the day after Irma rolled through and dropped about 6 inches of rain, if that is useful info to diagnosing this problem.