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Andricus lignicolus

Cola-nut gall wasp

Description

The species has alternating sexual and asexual generations. The sexual gall is a small (2-3 mm)  unilocular bud gall. Much of the gall surface is concealed by bud scales. They develop through the early spring and mature in May, and the adults emerge immediately. The asexual gall is a bud gall, found singly or in small groups on lateral and apical buds. These galls are often most abundant on small trees and on the shoots at the base of larger trees. Hard and woody spheriacl galls (7-15 mm in diameter). Old galls remain on the tree for years. The galls mature by late autumn, the adults of the asexual generation emerge in May of the following year, or a year later. It occurs in oak forests, particularly in younger stands. Also in parks, gardens and tree nurseries.

Symptom

Hard round galls on a twig, often in a group. The surface is wrinkled.

Tree Species: Oak

Part of a plant- attacked: Branch

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 1 observations of the species in the system

Andricus lignicolusCola-nut gall wasp
majo
Number of votes: 0
Published: 20.9.2024