The mite Aceria genistae causes galls to form on the buds of Broom (Cytisus scoparius). The galls take the form of an irregular mass, 5 to 40mm across, formed of miniature distorted leaves covered with greyish pubescence. These galls conceal and nourish the mites. The galls are seen more often than the mites.

Gall  Adult

Where Broom is present.

Galls may be seen from late spring and are visible during most of the year.

Infrequent or under recorded in Britain.

Infrequent or under recorded in Britain.