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Andricus kollari

Oak marble gall Andricus kollari

Description

It is one of the commonest galls in oak forests in Central Europe. On oaks lives an asexual generation of this small wasp. On twigs of oaks it forms a round, pale brown, hard gall with a diameter of 1-3 cm. The galls often appear in groups in a large number, which can weaken mainly young plants. From the gall hatch small wasps that lay eggs on the leaves of Quercus cerris. There they form small galls in which is developed a sexual generation.

Symptom

On twigs of oaks it forms a round, pale brown, hard gall with a diameter of 1-3 cm.

Tree Species: Oak

Part of a plant- attacked: Branch

Pest significance: Harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 4 observations of the species in the system

Andricus kollari Oak marble gall Andricus kollari
milan
Number of votes: 0
Published: 14.8.2025

Andricus kollari Oak marble gall Andricus kollari
zahradkar
Number of votes: 0
Published: 5.10.2021

Andricus kollari Oak marble gall Andricus kollari
zahradkar01
Number of votes: 0
Published: 17.8.2021

Andricus kollari Oak marble gall Andricus kollari
zahradkar
Number of votes: 0
Published: 5.3.2021