Botrytis cinerea Pers.Fr.
Distribution: Worldwide; common to all fruit-growing regions in eastern North America.
White to gray mycelium forms on the surface of the rot under humid conditions, which produces tufted gray spore masses.
Dave Rosenberger, Cornell Univ.
Lesions usually start at the calyx or stem end of the fruit or at wound sites as small water-soaked areas. As lesions age, they enlarge, turning from grayish-brown to light brown, and eventually to a darker brown. White or grayish-white mycelium form on the surface of the rot under humid conditions (A); however, little sporulation occurs at cold-storage temperatures. Apples coming out of CA storage appear firm and tan, and when completely decayed, look like baked apples (B) (compare with blue mold).