You know what it looks like… but what is it called?
TAKE THE QUIZ“stem end”
The following 2 entries include the term stem end.
stem-end browning
noun: a storage disease of potatoes of undetermined cause characterized by brownish or black discoloration at the stem end of the tuber
stem-end rot
noun: any of various rots (such as decay of citrus fruits caused by fungi of the genera Diplodia, Dothiorella, and Phomopsis) starting at the point of attachment to the plant
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Merriam-Webster unabridged