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They range anywhere in North America where cole crops are grown.
Meals include cabbage, cauliflower, broccoli, radish, brussel sprouts, and turnips. The damage is extensive and the vegetables non-edible. Controls include rove beetles which prey on the maggot eggs and young larvae. Rove larvae parasitize the pupa stage of the maggot. Keep lots of organic soil in your garden to attract the rove beetle. A tiny wasp called Trybliographa rapae will lay its eggs in the maggot larva if the larva are close enough to the soil surface. Other controls include covering healthy plants with row covers until they get established. Put 6 inch collars around the base of the plants to prevent adults from laying eggs near the plant stems. Remove wild mustard weeds because the flies love them.
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