Hi! We've got some young (about 3 years old) beech trees which we've just potted on for planting out at some point. Noticed today that there's an unpleasant white growth/mildew/aphid infection on all of them, but I can't identify it from books, or the web. Can anyone out there tell me what it is, please, and - more importantly - what on earth we can do to get rid of it. The trees have only just been potted on, so are in the unheated greenhouse (well ventilated) at the moment, to keep them out the vicious cold wind.