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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)

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Root maggots (onion and cabbage maggots)

Delia spp.

Root maggots (onion and cabbage maggots)

Whitney Cranshaw, CSU,

Size: Up to 1/4 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.

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