University of Minnesota Extension
Menu Menu

Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - Under than 1/4 inch long > Root maggots (onion and cabbage maggots)

Root maggots (onion and cabbage maggots)
Photo Credit: Whitney Cranshaw, CSU,

Root maggots (onion and cabbage maggots)
Delia spp.
Size: Up to ¼ inch long

Where/When: Feeds on the roots of onion and several crucifer plants, including broccoli, radishes, cabbage, cauliflower, and turnips. Activity starts in late May and continues for 4 weeks. Larvae are rarely, if ever, seen.

Significance: Infested plants can appear discolored, wilted, or stunted and damage may kill young plants.
Give us your feedback
  • © 2015 Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy