aww you don't suck
Poor tree, it really isnt your fault! In fact where I live in Niagara Ontario this pest is a HUGE problem, and can whipe out whole orchards. I am actually having the same problem with my tree right now! I just posted it in the forum actually... I have a Frost peach tree that is 3 years old and JUST started to flower this year... I was SO excited to see so many flowers, because I know this means peaches! I myself, caused the borer problem and am learning from my mistakes. 1. I used a plastic tree guard around the trunk for 1 growing season and winter. don't do this, as I think it gives the borers a nice little hiding place in your tree. 2. I over-mulched around the base of the tree... it moistened the bark and gave perfect entry for the tree, also another hiding spot.
I dug away and mulch and took the wrap off for a start. My damage is only at the rootstock. Here is a link I found very useful
https://www.arbico-organics.com/category ... er-control
A couple things I want to mention... In canada they sell spray on tree paint at lowes, canadian tire, home depot blah blah blah.... its all the same spray cans and its BLACK never use black paint on a tree it absorbs heat and can cause cracking in winter thaws/high temps. You are better off going to a hardware store and buying a paint brush with acrylic/ latex paint and painting the tree WHITE as it reflects light and stops bark cracking. When I drive by stone fruit orchards all the tree trunks are painted white. It will deter the bugs and stop cracking ( an entry route)
Also buy a spray of pyrethrin. Only do spot sprays in growing months because it does affect good insects as well as bad... do total sprays in off seasons. It is a natural extract from flowers, not to be confused with permethrin (synthetic compound used to manage headlice, scabies, and also used in gardening) its more toxic.
There are 2 kinds of borers... one that attacks the base, and the others the branches. You may be able to prune off the branches heavily affected. and treat the base of the tree. Poke any holes with wire, and try and find some good pheromone sticky traps. (I would personally place them at some distance from the tree....
I would personally rip off any blossoms and forgo any fruiting this year. Try the spraying, and by sacrificing the fruit you may be able to get the tree to heal itself from the damage (also protect the bees from the spray)
for the base I also watched a video on youtube of a guy who created a cup around the tree and flooded the base with a hose for a few hours to drown them.
anyways I wish you the best of luck with your trees... it really is a horrible pest. Sorry if I wrote a story here, but this is what I've learned from my experience.
Also, if you have any other stone fruits (plums, cherries, apricots...) these will all be affected by the same pest so I could treat them the same proactively.