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Aculus hippocastani

Gall mite Aculus hippocastani

Description

Aculus hippocastani is a gall mite from the Eriophyidae family, inducing erinea - dense patches of fine hairs - on the underside of horse chestnut (Aesculus hippocastanum) leaves. These galls are initially white, turning brown over time, and are typically located along leaf veins. The mite's activity can diminish the ornamental value of trees, especially in urban settings.

Symptom

Presence of white to brown hairy patches (erinea) along leaf veins on the underside of horse chestnut leaves.

Tree Species: Horse Chestnut

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Mites

Invasive Species: No

Present in EU: Yes