noun Plant Pathology.
a disease of apples, grapes, and other fruit, characterized by cankers on the branches or twigs and bitter, rotted fruit, caused by any of several fungi.
Origin of bitter rot
An Americanism dating back to 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for bitter rot
Historical Examples of bitter rot
Ripe-rot or bitter-rot (Glomerella rufomaculans) is a disease due to the same fungus causing the bitter-rot of the apple.Manual of American Grape-Growing
U. P. Hedrick