Turnip Flea Beetle? - Phyllotreta nigripes?
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Species Description
Widespread and locally frequent in the southern half of the UK. Habitat includes: Anywhere with Brassicas such as gardens, allotments, arable fields, coasts etc. Similar species: Phyllotreta atra, Phyllotreta consobrina, Phyllotreta cruciferae.
Found on Sea Radish.