Seedcorn maggot larvae may feed on underground stems
Adult: Seedcorn maggot adults (flies) are about 0.2 inches (5 mm) long with gray to brown bodies. They resemble houseflies but are about half their size and overlap their wings at rest
Egg: White, elongated; deposited in soils rich in organic and decaying matter and/or on seeds and seedlings.
Larva: Maggots are legless, tapered, about 0.25 inches (6 mm) long, and yellowish-white in color. Head-ends are wedge shaped with small black mouth hooks in front.
Pupa: Oval shaped, dark brown, about the size of a grain of wheat, and found in the soil.