Several fungi can cause developing and ripe strawberries to rot. In Kentucky the most common and economically important of these diseases is gray mold, caused by the fungus Botrytis cinerea. Also called Botrytis rot or ash mold, it is an ever-present threat to strawberries both in the field and after harvest. It can be particularly devastating because the disease strikes after investments in the crop have been made, but before returns have been fully realized.
Hartman, John R. and Hershman, Donald E., "Gray Mold of Strawberry" (1987). Agriculture and Natural Resources Publications. Paper 70.