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Phacidiopycnis rots are emerging postharvest diseases of apple and pear in the U.S. Pacific Northwest. These diseases have previously been reported in Europe and India and most recently in Chile. In Washington State and Oregon, Phacidiopycnis rot is common on pears, whereas speck rot is more common on apples in Washington State. Recent surveys have confirmed that these rots continue to be an emerging threat in the PNW and will require future management attention.
For more information about Phacidiopycnis rot and Speck rot and their management visit our page Postharvest Diseases: Phacidipycnis Rot.
Speck Rot in Apple
This rot of apples is primarily caused by P. washingtonensis and is refered to as Speck rot. Speck rot presents with two symptoms. Flesh infections are spongy to firm, not separable from healthy tissue, and is sometimes visually similar to gray mold. The color of the decayed area is light to dark brown, and black in advanced stages. A second symptom of infection starts at lenticels. Symptoms are brown to black specks with a white to light tan center around the lenticels. Both symptoms appear more often on the calyx and stem end of the fruit.