Some infections only show when fruit begins to ripen.įruit rot starts with a small, round brown spot, which expands to eventually rot the entire fruit. Once infected, fruit remains attached to the tree and provides an additional source of spores for more infections instead of dropping off in a normal fashion. Spores from infected flowers and cankers infect healthy green fruit during long wet periods. Shoot infections (usually from flower infections) result in small (1 to 3 inches) gummy cankers, which provide the source of infection for fruit rot. Infected flowers wilt and turn brown very quickly. It is caused by the fungus Monilinia fructicola, and can also infect flower blossoms and shoots. Clemson University – USDA Cooperative Extension Slide Seriesīrown rot is one of the most common and serious diseases affecting peach fruits.
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