Delia floralis Fallen Turnip root fly

This northerly distributed species occurs in many parts of continental Europe and in northern England and Scotland. The larvae attack various vegetable brassicas and oilseed rape but are most often associated with swede and turnip crops. They feed deeply within the hearts of host plants from September onwards, and there is usually just one extended generation annually. Adults (6-8 mm long) are essentially similar in appearance to those of Delia radicum (above); the larvae are distinguished from those of D. radicum by slight differences in the papillae surrounding the posterior spiracles, none being bifid.

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