See:
Apple (Malus spp.) - Perennial Canker (Bull's-eye Rot)
Pear (Pyrus spp.) - Storage Rots
Note Cryptosporiopsis perennans (sexual: Neofabraea perennans), a fungus, was not found in any samples of woody pear tissues. However, this was the the second most prevalent species associated with bull's eye rot of pear, and had a widespread distribution in Oregon's pear production areas.
References Henriquez, J. L., Sugar, D. and Spotts, R. A. 2004. Etiology of bull's eye rot of pear caused by Neofabraea spp. in Oregon, Washington, and California. Plant disease, 88:1134-1138.