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Andricus conglomeratus

Gall wasp Andricus conglomeratus

Description

Andricus conglomeratus is a gall wasp that induces characteristic round galls on oaks (Quercus spp.). The galls are nearly spherical, reaching up to 2 cm in diameter, and often occur in clusters. They are common, particularly on small bushy trees. Gall development occurs throughout the summer, maturing in late autumn. While the galls do not cause significant damage to mature trees, heavy infestations on young seedlings can severely stunt their growth. The species is distributed across Europe, mainly in warm and temperate regions.

Symptom

The galls are globular, up to 2 cm in diameter, and often occur in clusters.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes