Thursday, June 9, 2011

What's this?

This is a very old collected mugo pine, Pinus mugo. It has been a bonsai since more than twenty years, always happy and throwing nice and healthy new needles. This year all of a sudden this. The tree seems healthy otherwise. There are more than 150 other pine trees in my garden. Not a single one has anything like this. What is it? What can I do against it?