Definition of seed corn maggot in English:

seed corn maggot

noun

US
  • The yellowish-white larva of a fly, Delia platura (family Anthomyiidae), which infests the planted seed of many crop plants, especially beans and sweetcorn, preventing sprouting or causing the seedlings to be weak and spindly.

Origin

Mid 19th century; earliest use found in American Entomologist.