as the plant bolts in the spring, mites move into the vegetative and flower buds to induce galls, erineum (an abnormal growth of hairs from the leaf surface), and other tissue deformities. Bud galls may be inconspicuous since they are located in the lower part of the crown, but may be common locally. Such damage results in the stunting of the plant. Gall induction within the flowers reduces or completely eliminates seed production.

- United States Department of Agriculture: (2018) Field release of the gall mite, Aceria drabae (Acari: Eriophyidae), for classical biological control of hoary cress (Lepidium draba L., Lepidium chalapense L., and Lepidium appelianum AlShehbaz) (Brassicaceae), in the contiguous United States, Environmental Assessment, January 2018^©