It happens to my trees all the time.
Not sure why but I just spray with my DIY insecticide after harvest, and then with my DIY fungicide at bud break.
The trees are doing fine so far.
I didn't do it. You can't prove it. Nobody saw me. The sheep are lying! This tiny ad is my witness!
Permaculture Voices 1, 2 and 3 - all 117 hours of video!