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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Flies, moths, wasps,and other insects with obvious wings - Under 1/4 inch long > Onion maggot

Rose aphid
Photo Credit: Jeff Hahn, Univ. of Minnesota

Onion maggot
Delia antiqua
Size: ¼ inch long (Note: There are other flies that are similar in appearance that are not necessarily pests in your garden. Have flies identified to determine their pest status if it is not clear what they are.)

Where/When: The female lays eggs at the base of onion plants and in nearby cracks in the soil. Active April and May.

Significance: The larva causes damage by feeding on the onions. Infested plants can appear discolored, wilted, or stunted and damage may kill young plants.
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