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Mint leaf beetle

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Time to act
Time to act

Do not Time to act in January

Do not Time to act in February

Do not Time to act in March

Do not Time to act in April

Do Time to act in May

Do Time to act in June

Do Time to act in July

Do Time to act in August

Do Time to act in September

Do not Time to act in October

Do not Time to act in November

Do not Time to act in December

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.

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Symptoms

Holes in leaves, made by iridescent green beetles and their and fat, black grubs.

Find it on

mint, pennyroyal

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Organic

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. You could also spray with organic pesticides based on pyrethrum in spring and summer.