@Spaugh - Yes vinegar contains the acid I mentioned. The method you mentioned is somewhat different as I have mentioned and have been practicing for many years. In the method you found, they take besides (only!) 5% wine vinegar other substances that are also organic. In the method I mentioned, which I have been practicing for many years, acetic acid is used exclusively, but it is twice as concentrated as in commercial vinegar, namely 10%. In Europe one can buy acetic acid in 20% to 60% concentration quite inexpensively canister-wise. Look, concentrated acetic acid is so easily available in your country. If yes, I would recommend my method to you. It has only one disadvantage: Anything that gets overspray other than the peach tree can be damaged, this can be weeds, lawns, evergreen plants of any kind. Deciduous woody shrubs usually have no problem with acetic acid. If you like, I can refer you in the next few weeks to a publication in German by the University of Hohenheim (Germany) on the treatment of peach ripple disease with acetic acid.