Polydrusus is a genus of broad-nosed weevils in the family Curculionidae, comprising over 180 species native to Europe and parts of North America. These beetles are often metallic green and are commonly found in woodlands and gardens.
A notable species is Polydrusus formosus, the green immigrant leaf weevil, measuring 5–7 mm. It features emerald green scales over a black body and feeds on young leaves and buds of deciduous trees like birch, oak, and fruit trees. Larvae develop in the soil, feeding on roots, and adults are active from April to August. While generally harmless, they can cause cosmetic damage to fruit crops.
Another species, Polydrusus impressifrons, or the pale green weevil, is slightly smaller at 3.8–5.6 mm. It has bluish-green scales and a broader head. This species feeds on various trees and shrubs, including poplar and birch, and is found across Europe and parts of North America.
Both species are often mistaken for those in the genus Phyllobius due to similar appearances.
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Maikel de Bakker
