AppearanceThe colour of this insect is brilliant green, as the black body is coated in emerald scales.
The soil-inabiting larvae grow up to 7 millimetres long feeding of juicy plant roots. In Autumn their development is complete. They overwinter and pupate in Spring.
The adults grow up to 5–6 millimetres long and can mostly be encountered from April through August. Adults of this beetle lay their eggs in the bark or leaves of the host-plants.
NamingP. formosus has long been known under the name Polydrusus sericeus and is still often featured as such in older literature and keys.
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