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Definition of seed-corn maggot
: a small yellowish grub with a pointed head that is the larva of a grayish brown two-winged fly (Hylemya platura), is native to Europe but now widely distributed in North America, and is typically a destructive borer in seeds and seedlings (as of Indian corn, beans, or melons) but sometimes attacks stems or roots of older plants
— called also corn maggot
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