The mite causes abnormal plant growths, known as galls on their primary host, elm trees (Ulmus species).

To complete there life-cycle they feed on a secondary host, the roots of currant bushes (Ribes species).

Numerous aphids living in the gall in spring and early summer, are browish to dull green and covered in wax.

Winged aphids (all female) leave the gall in June and July, mating and living in the secondary host; currant bushes.

Eriosoma grossulariae galls and aphids are similar but are not covered or contain wax.