Please I.D. this damage to Santa Rosa Plum
The fruit set was meager to non-existant this season here in Purling NY (Zip 12470 - 5b).
This does not effect me too much as my trees are still young and I was planning to thin murderously to let them "beef up".
But, on a few that did set I found the damage a shown on the photo.
Can anyone I.D for me?