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Aceria populi

Poplar gall mite

Description

Aceria populi is a mite species from the family Eriophyidae that feeds on various Populus species, such as Populus nigra, Populus alba, and hybrids like P. x canescens. This monophagous mite creates distinctive galls, primarily on buds and occasionally on leaves. These galls are irregular, wart-like, or cauliflower-shaped outgrowths, initially soft and hairy, with a color ranging from gray or yellow to green and reddish. Over time, the galls harden and darken to brownish shades. Aceria populi is widespread in Europe, particularly in regions with abundant poplar forests.

The mites affect the health and aesthetic appearance of trees, reducing their vitality and causing deformities in buds and shoots. The galls disrupt the natural form of poplar trees, particularly ornamental varieties, diminishing their landscape value. Unlike damage caused by other gall-forming mites, A. populi galls lack internal chambers and are unique in their cauliflower-like shape.

Symptom

Galls appear as irregular, wart-like growths on buds or occasionally leaves, measuring 10–30 mm. Initially soft and hairy, they become woody and dark with age. No internal chambers are present.

Tree Species: Poplar

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Mites

Invasive Species: No

Present in EU: Yes