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Parornix devoniella

Hazel slender

Description

Parornix devoniella is a small moth from the family Gracillariidae whose larvae mine the leaves of hazel species (Corylus avellana, C. colurna, C. maxima). It occurs throughout most of Europe, except for the Iberian Peninsula, the Balkans, and Mediterranean islands. The species has two generations per year, with adults flying in May and August. The larvae initially create a small, rectangular mine between two side veins of a leaf, later moving to a folded leaf margin, where they continue feeding.

Although the damage is mostly aesthetic, extensive infestations may cause premature leaf drop, reducing tree vigor and ornamental value.

Symptom

Early larval stages form small, triangular or rectangular mines, which later become transparent. The larvae eventually abandon the mine and create a folded leaf margin. Frass is accumulated in one corner of the mine.

Tree Species: Hazel

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes