You know what it looks like… but what is it called?
TAKE THE QUIZ“stem maggot”
We have one entry that includes the term stem maggot.
wheat stem maggot
noun: a maggot that is the larva of a small pale yellow black-striped fly (Meromyza americana) of the family Chloropidae and that bores in the stems of wheat and other cereals
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Merriam-Webster unabridged