Have just been round to friends for a lovely meal ;D and thought would return the generousity with some investigation here. My friend has three Acers (two green, one purple) and they all seem infested at the moment. The purple Acer's leaves are covered in a white powdery stuff, on the stems as well. And all three have sort of pock marks/little cuts etc on the leaves. Apparently they've been like this for a few weeks and getting worse. She did spray them with Miracle Grow two days ago - spray on the leaves as well, but the problem was there before this.
They are all in sheltered positions and are quite decent sizes (ie between 1ft and 3.5ft high). The purple one and a green one are next to each other, but the other acer is at the other side of the garden. No other plants seem to have a problem. Two are in containers, one is in the boarder. They have had the plants quite a few years with no problems.
Anyone have any ideas? Have tried to post photos but as OH is away and I am a digi photo/computer linked novice, can't manage it!
