Robin's Pincushion

This unusual growth is usually found on rose plants, in this case the field rose. It is caused by the reaction of the plant to being attacked by the Gall Wasp (Diplolepis rosae) which lays its eggs in the leaves or stem of the plant. The larvae remain in this protective 'gall' until spring. The galls themselves can be green, yellow or as seen here vivid red. Posted by Picasa