Neuroterus quercusbaccarum

Common spangle gall

Description

The species has two alternating generations. The spring sexual generation develops in commonly gregarious, unilocular, globular, berry-like galls (4-8 mm in diameter) on catkins, and can also develop on the leaf lamina. The adults emerge from the galls in June. The autumn generation develops in spangle gall (4-6 mm in diameter, 2 mm thick) on the underside of leaves, rarely on the upper side. This gall is more abundant on trees showing late budburst. The asexual spangle galls fall in August, September, adults emerging the following spring.

Symptom

The spring sexual generation develops in commonly gregarious, unilocular, globular, berry-like galls (4-8 mm in diameter) on catkins, and can also develop on the leaf lamina. The autumn generation develops in spangle gall (4-6 mm in diameter, 2 mm thick) on the underside of leaves, rarely on the upper side.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Seasonal frequency of occurrence