What is causing my cherry tree branches to grow like this?

Question

Not all of the branches are like this just several on each of my cherry trees.

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Answer 1

The deformity that you show in the photo is called "fasciation".

https://www.gardeningknowhow.com/plant-problems/environmental/fasciation-in-flowers.htm

Fasciation can be caused by a genetic mutation, bacterial or mite infestation or systemic herbicide damage.

You can prune those pieces out and if you have not begun a dormant spray program then start ASAP. Horticultural oil and copper fungicide spraying is organic program compatible and will help to suppress over-wintering insect and mite pests, fungal and bacterial infections.

https://wimastergardener.org/article/fascinating-fasciation/