Editors: W.T. Wilsey, C.R. Weeden, and A.M. Shelton
Maggot (Delia radicum) - Life Cycle
for larger image
Cabbage maggot flies resemble houseflies but are only about half as
long, 1/4 inch (6 mm). They are dark gray with black stripes along
the body. Adults emerge between late March and early May. There are
3-4 generations per year.
The cabbage maggot fly deposits its eggs on or in the soil at the
base of the plants. The eggs are white and elongated. Eggs hatch into
maggot larvae in 3 to 7 days.
The legless maggots are tapered and white in color, and are usually
less than 1/3 inch (6 mm) in length. The head is the pointed end and
at the rear or blunt end they have 12 short, pointed fleshy processes
arranged in a circle around two button-like spiracles. Newly hatched
larvae feed and burrow into the roots. The crucifer-damaging life
stage, maggots feed for about 3 to 5 weeks before pupating in the
root tunnel or in the soil.
The pupa is brown in color, egg shaped and 1/4 inch (6 mm) long. Pupae
remain in the soil for 2 or 3 weeks before adult emergence.
Damage inflicted by cabbage
maggot on cabbage and crucifers
©All material is protected
by Section 107 of the 1976 copyright law.
Copyright is held by Cornell University.
Maintained by Jason D. Plate. Last updated Mar. 8th, 2007.