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Aceria macrochela

Gall mite Aceria macrochela

Description

On the upper side of field maple leaves are found up to 2 mm long, round, pale green, fine hairy galls. They usually occur in groups of 10–20. They are located on veinlets. 2–4 of them are almost always located at the juncture of the leaf stem and blade. Acer campestre is a preferable host of this species, which can sporadically occur on other maple species as well.

Symptom

Small tumorous formations on the upper side of the leaves, always located on the veins.

Tree Species: Maple

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Mites

Invasive Species: No

Present in EU: Yes

Seasonal frequency of occurrence

Seasonal frequency of occurrence