I have two acers which I bought as small plants earlier this year. I repotted them with John Innes No. 2 and they have grown well in the corner of my north-facing garden. They were by a fence and during the summer I had some sweet peas and some fuschias between them. The sweet peas developed mildew and the fuschias got black spot, so I got rid of both a couple of months ago. Now my acers seem to have similar black spots on their leaves, which have curled up at the edges, gone brown in places and are falling off. I don't think they are the same as tar spots(?) and I haven't seen any insects. Is it possible that the plants have been infected from the fuschias? Is there anything I can do to save them? Thanks.