Technical Abstract: Peach fungal gummosis, incited by Botryosphaeria dothidea (Moug.:Fr.) Ces. & De Not., has been shown to be capable of reducing growth and yield by up to 40% on susceptible peach [Prunus persica (L.) Batsch] cultivars. Initial field screens demonstrated that several important peach cultivars utilized in the southeastern U.S. peach industry were very susceptible to this disease. At this time there is no management program for this disease other than orchard practices to reduce inoculum in the orchard. In several field tests under high inoculum pressure no fungicide tested appeared to provide effective control. However, several ‘barrier’ treatments appeared promising. The relative susceptibility of additional peach cultivars, including many recently introduced, was determined.