Mint leaf beetle
Mint leaf beetles may feast on your garden mint - learn how you can get rid of them.
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The mint leaf beetle, Chrysolina herbacea is a native, iridescent green beetle that feeds on the leaves of the mint family in the south of the UK. Both the adults and their fat, black larvae feast on the foliage.
Find out how to identify and deal with mint beetle in this clip from Gardeners' World:
Holes in leaves, made by iridescent green beetles and their and fat, black grubs.
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Mint is a prolific plant, so there's no need to control the beetles. If you're worried, you could try growing pennyroyal, Mentha pulegium as a sacrificial crop, or simply remove beetles and larvae by hand and squish them.