Lydia, you should reach out to your local Texas A&M Extension professionals for help on this problem. Be sure to tell the specialist that you are concerned about the peach tree....control is even more difficult for edibles.

put tanglefoot around the trunk of the tree, the ants won't cross it.

If you do that, first put a poly sheeting strip at least 4 inches wide around the trunk, then slather the sticky stuff on the plastic.

Check every now and then because the ants will bridge it with a combo of ant bodies and soil particles.