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The flies lay their eggs around the developing carrots.
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Crop damage is caused by the creamy-yellow larvae (maggots) feeding on the outer layers of the carrot root. In autumn, they may penetrate further into the root.
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The legless larvae are up to 10 mm in length.
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Foliage becomes wilted and discoloured.
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Leaves turn rusty red to scarlet with some yellowing. Rusty-brown tunnels are seen under the outer skin of mature roots.
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