A mite causing galls on the leaves of Geranium species.  The leaves are paler than usual, thickened and rolled into a mophead at the shoot tip. The mites live inside the leaves, and are minute, whitish and worm-like; they cannot be seen with the naked eye but are just discernible using a stereo microscope.

Photographs of the galled plant; ensure you have identifed the host plant

rarely recorded