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The absence of red color in a streaked “Bleaching” pattern is periodically noted on late-season peaches in middle Georgia. The streaked pattern led to a hypothesis that accumulation of pesticides in the stem end of the fruit prevented anthocyanin formation. However, analysis of pesticide residues on affected and unaffected peel suggested this was unlikely. We observed that trees affected by fungal gummosis (caused by  Botrysphearia dithodia ) were most often affected by the “bleaching” phenomenon and that `Summer Gold', the most fungal gummosis–susceptible variety, had the greatest incidence of the disorder. In a preliminary trial, we tested the hypothesis that fungal gummosis mediates “bleaching” by interfering with anthocyanin color formation in the peel of developing fruit. Tree gum/resin and pesticides were tested for their effect on peel color development. The gum/chemical preparations were dripped onto fruit prior to anthocyanin or red pigment formation in peach peel. After the anthocyanescent period, fruit were observed for bleaching. The gum mediated a negative effect by sulfur, captan, and carbaryl in peel color formation in peach. Fenbuconizole and phosmet had a less negative effect on color formation, although the effect was noticeable. The gum alone, propiconizole, and chlorothalonil did little to effect on peel color formation.

Occurrence of Preharvest Peel Streaking Is Associated with Gummosis and Pesticide Usage in Peach