The mite Aceria sanguisorbae causes galls to form on various Sanguisorba/Poterium species.  The leaves, stems and sometimes the flower buds are covered in thick white, or yellow-white felt like erinea containing the mites.

Gall  Adult

Adult: Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Areas where Sanguisorba species occur.

When Sanguisorba or Poterium species are in leaf.

Status in Britain is difficult to determine due to lack of records.

Status in Leicestershire and Rutland not known.