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Chilaspis nitida

Gall wasp Chilaspis nitida

Description

Unisexual generation forms monolocular, pale green globular galls 4-6 mm in diameter on the under side of leaves, usually gregariously. They fall down in October, when they are dry and grey-brown in colour. The bisexual generation forms a globular purple cotton wool-like mass, 10-30 mm across, within which can be found a variable number of hard inner cells, each 2-3 mm long. This generation completes its development by the end of May. Later the galls dry and disintegrate. Both generations live exclusively on Quercus cerris. Often very abundant.

Symptom

Unisexual generation forms monolocular, pale green globular galls 4-6 mm in diameter on the under side of leaves, usually gregariously.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes