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Coleophora kuehnella

White oak case-bearer

Description

The larva of Coleophora kuehnella develops inside a characteristic case. The case is partially covered by a silken mantle (pallium), which gives it the appearance of a bird dropping. The larvae feed on the underside of oak leaves, creating numerous small fleck mines, often up to 30 in one area. The species is monophagous, feeding exclusively on oaks (Quercus petraea, Q. robur, Q. rubra). The larvae reach full maturity in early June. The species is known also as Coleophora palliatella.

The distribution of C. kuehnella extends from Fennoscandia to the Iberian Peninsula, including Italy, Sardinia, Albania, and from Britain to southern Russia. Infestation by this species leads to visible mining damage on oak leaves, which may cause discoloration and premature leaf drop, affecting both the aesthetic appearance and overall health of the tree. Although the damage is usually not severe, high population densities may contribute to weakened tree vitality when combined with other stress factors.

Symptom

On affected oak leaves, numerous small fleck mines appear on the underside, often clustered in groups. The black cases are present on the leaves. Severely affected leaves may develop discolored patches and premature browning or curling.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes