« Back

Trigonaspis synapsis

Gall wasp Trigonaspis synapsis

Description

It has two alternating generations. The sexual generations develops in unilocular, 5–6 mm long bud galls, regularly found on older shoots and branches. Adults emerge in May/June. The asexual generation forms a globular (5–6 mm in diameter) leaf gall on the upper surface. It is green when young, later gets reddish and brown. The adults of this generation emerge late autumn/early winter.

Symptom

Small brown galls on the underside of the leaves.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Present in EU: Yes