Bacterial canker.
Read the threads below on bacterial canker in cherries.
https://growingfruit.org/t/how-virulent-is-bacterial-canker-in-cherries
https://growingfruit.org/t/sweet-cherry-recovers-from-bacterial-canker/
https://growingfruit.org/t/bacterial-canker-gummosis-borer-damage-apricot-and-aprium/
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