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Rhynchaenus fagi Linné
Coleoptera: Curculionidae
Univoltine (V-VI.). Main host is Fagus, but it can also develop on many other broadleaved trees (Alnus, Betula, Carpinus, Salix, etc.). The overwintered adults come out in May and their feeding causes "shot holes" on leaves. Females lay egg on young leaves. The first part of the mine is a gradually widening serpentine tunnel. Later - most often at the tip of the leave - it becomes a large irregular blotch mine. The mined tissues get brown and dry resembling frost damage. The larva is light coloured with brown head capsule, pupates in a small chamber made within the mine. Outbreaks are usually connected to droughty periods and frost damage in May. Can cause considerable defoliation. Occurs in whole Europe, common in Hungary.
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