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.
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How to use bitter rot in a sentence
In Illinois, to illustrate, we have what is called the bitter rot fungus in the southern part of the state.
If any one has the bitter rot they are scared to death, they think they are suffering untold misfortune.
To these should be added in the South and middle latitudes, sooty blotch and bitter rot.Apple Growing | M. C. Burritt
The pecan has a fungus attacking it that is very similar to the bitter rot of the apple.
The pecan anthracnose looks like the bitter rot, has the same pink spore masses and you will be able to recognize it.