Peach Tree Gummies
Thanks for your question. Your tree does, indeed, appear to have 'gummosis,' but that doesn't determine the cause, which can be either bacterial or fungal. I have been unable to talk to a faculty member, since it is a University holiday. I will get back to you with more information when I am able to do that. However, I suggest you apply a fungicide horticultural oil while the tree is still marginally dormant. (I can see some early budding, so you may have missed the time for using some of the oils recommended in the article (https://catalog.extension.oregonstate.edu/ec631) mentioned in this one: https://extension.oregonstate.edu/news/get-leg-fruit-tree-problems-dormant-oils
I will get back to you!