Green Immigrant Leaf Weevil (lat. Polydrusus formosus)

Polydrusus formosus is a species of broad-nosed weevils belonging to the family Curculionidae, subfamily Entiminae….

Distribution

This beetle is present in most of Europe and in the Nearctic realm.

Description

The adults grow up to 5–6 millimetres (0.20–0.24 in) long. The colour of this insect is brilliant metallic green, as the black body is coated in emerald round scales. If the scales wear off the body beneath appears dark. Antennae are pale with a dark club. These beetles show a short groove between the eyes and evident striae on the elytra.

Biology

Adults can mostly be encountered from April through August. These beetles lay their eggs in the bark or leaves of the host-plants. The soil-inhabiting larvae grow up to 7 millimetres (0.28 in) long feeding on juicy plant roots. In Autumn their development is complete. They overwinter and pupate in Spring. The adults are eaters of young leaves and open blossoms of a wide variety of woodland trees and shrubs (Corylus avellana, Quercus species, etc.), but also fruit trees (apple, pear, cherry, etc.) They are considered a pest of fruit trees, causing extensive damages to their buds, blossoms and shoots.

Bibliography

Helden, A. 2005, Polydrusus (Chrysophis) formosus (Mayer, 1779) (Coleoptera: Curculionidae): a weevil new to Ireland, Irish Naturalists’ Journal, 28 A. G. Duff (2008). “Checklist of Beetles of the British Isles” (PDF). The Coleopterist. https://web.archive.org/web/20110705155707/http://www.coleopterist.org.uk/checklist2008%20A5.pdf. Retrieved August 13, 2010 David V. Alford – Pests of fruit crops – Academic Press

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Copyright and source information

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