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CABBAGE FLY : Delia radicum

Also known as the cabbage root fly, root fly or turnip fly. 

This is a pest to crops so its names are very relevant. The larvae of the cabbage root fly are sometimes known as the cabbage maggot or root maggot. The adult flies are about 1 cm long and are grey in colour, but otherwise resemble the common house fly. [Wiki].

The flies can be found all over Europe. After overwintering as pupae in the soil, the flies emerge in spring, feed on nectar, and lay eggs close to plants of the genus Brassica. The eggs are white and about 1 mm in diameter. They hatch into white maggots after about six days and the larvae feed for about three weeks on the roots and stems of the cabbage plants. After this, the larvae are typically 0.9 to 1 cm in length and form reddish-brown pupae which hatch into adult flies after around 20 days.

NBN ATLAS, SCOTLAND : https://scotland-species.nbnatlas.org/species/NBNSYS0100002766

WIKIPEDIA : https://en.wikipedia.org/wiki/Delia_radicum

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