Feeding by the mite transforms meristematic buds into diagnostic galls ... Galls are characterised as deformed foliar tissue that collectively forms a round, pubescent mass arising from a foliar bud.
”- Paul D. Pratt, Michael J. Pitcairn, Scott Oneto, M. Brent Kelley, Clayton J. Sodergren, Frédéric Beaulieu, Wayne Knee & Jennifer Andreas: (2019) Invasion of the gall mite Aceria genistae (Acari: Eriophyidae), a natural enemy of the invasive weed Cytisus scoparius,into California, U.S.A. and predictions for climate suitability in other regions using ecological niche modelling©