See:
Apple (Malus spp.) - Anthracnose (Bull's-eye Rot)
Apple (Malus spp.) - Perennial Canker (Bull's-eye Rot)
Notes Infection by several fungi can result in the "bull's-eye rot" symptom. The anthracnose fungi Cryptosporiopsis curvispora (sexual: Neofabraea malicorticis), N. vagabunda (formerly N. alba) and C. kienholzii and the perennial canker fungus C. perennans have all been found in the PNW. Bull's-eye rot" occurs at open lenticels or at breaks in the skin. The fruit phase of these diseases shows first as brown, depressed, circular spots in storage. As a spot extends, fungus fruiting bodies (acervuli) develop in its center, often in concentric rings, which gives the name "bull's-eye" to the rot. Spots may also form late in the year on fruit that have been in the orchard.