After a year in my mini orchard 3 out of 10 harrow sweets decided to bloom and are all growing. So I can tell something is up when the apex bud is dull colored and hasn't opened, when everything else is well along.
So I peeled back the scales and sticky ooze was apparent as I continued to unfold the bud. Whew! Stinky and fermented smelling. Fireblight?
I cut it back