Acalitus rudis

Gall mite Acalitus rudis

Description

Gall mite Acalitus rudis causes deformation of the birch leaves. On the upper surface of the leaf, the galls appear as pale bulges. On the underside, there are creamy white spots with dense masses of tiny hairs - felt coating. Inside this felt coating live many microscopic mites that cannot be seen with naked eye. It can often be found mainly on Betula pendula and B. pubescens.

Symptom

On the upper surface of the leaf, the galls appear as pale bulges. On the underside, there are creamy white spots with dense masses of tiny hairs - felt coating.

Tree Species: Birch

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Mites

Invasive Species: No

Present in EU: Yes