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Delia Robineau-Desvoidy, 1830
This is a large genus of flies with several hundred species. They are found mainly in temperate regions and are plant parasitic, attacking mainly the roots, tubers, lower stems, or germinating seeds of various plants. Some species are polyphagous while others are more specialized. The most important agricultural pests are Delia radicum, Delia antiqua and Delia platura. The adults resemble small house flies. Taxonomically, the genus as well as the individual species are difficult to identify.
Currently, the following species have been entered into the system: