Gall-producing mites

July 30, 2015

Eriophyidae

Mites in this family are responsible for producing galls and dense patches of hair or beadlike growth called erinea on a number of plants. Several commonly seen galls are: maple spindle gall, maple bladder gall, and erineum on maple. The size of the mites is less than 0.5 mm.

maple spindle
Maple spindle gall on sugar maple.

Management

Treatment is not usually not necessary, as lasting harm to plants rarely occurs.

maple bladder gall Erineum patches
Left: Maple bladder gall on silver maple. Right: Erineum patches on undersides of silver maple leaves.

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