Black tar-like exudate on peach tree branch ends
If the shoot tips are swollen, I think it is an insect and not a disease. Oriental fruit moth is a pest of peaches that attacks the growing shoot tips early in the spring and then the fruit later in the season. If there is no fruit they will continue to lay their eggs on the shoot tips. There are 3 generations a year. Here is a link to more information.
I also attach a photo I have of the tip damage but I have seen the tip much more swollen than in this photo