Jeff Hahn, University of Minnesota
Size: 1/4 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 crucifer plants, including broccoli, radishes, cabbage, cauliflower, and turnips and in nearby cracks in the soil. Active April and May.
Significance: The larva causes damage by feeding on the roots of plants. Infested plants can appear discolored, wilted, or stunted and damage may kill young plants.