I have recently in my Surrey- Guildford neighborhood come across something on a tree (Pinus nigra) which is apparently called a witches broom. When I emailed a picture to a friend in The Netherlands, he told me what it was and apparently there is only one Pinus nigra witches broom in that country. I am curious how frequent or rare these apparitions are in our neck of the woods, and how old they may become. Should it be protected..... When I Googled Streetview at that location ( adress across the street) I noticed it was already there in 2009.