I contacted farmers market recently. I have two cherry trees affected, one Bing, one Stella. Noticed first on Stella 2-3 years ago. Just planted Bing this spring and now affected. Have one Stella, one montmorency, one Bing not affected...yet. The affected Stella has trunk scarring which I think is from it. I've noticed some frass at times, but not typically. I've tried to treat with a few things over last couple years but not very diligently: neem, copper, (spinosad, pyrethrum, BT just recently). Originally thought it might be fungus but more suspicious it's a borer. Not sure what to do about it and hoping to save the tree but maybe that's misguided. I have more pics if that would help Thank you!