Plum tree diseases

Question

This looks like shothole disease, but is it?

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Answer 1

These are leaf galls, caused by some pest on your tree.
Specific identification may help with control and treatment.
You can take a leaf sample to your nearest County Extension Office to inquire on any specific infestations in your region.

This article has more information.

https://www.gardeningknowhow.com/ornamental/shrubs/oleander/rejuvenating-overgrown-oleanders.htm

Here is a link to help you locate the nearest Extension Office.

https://www.gardeningknowhow.com/extension-search/