Blackened and rolled leaves on a maple – what causes this?
Ask a gardener
Question by: Hardy G
I greatly enjoy reading your garden tips, which in my view as a qualified gardener, and in contrast to those countless so-called experts, are without exception highly competent. Now I would like to ask a question which has troubled me for many years. The problem is an Acer palmatum dissectum atropurpureum (60 cm high, 180 cm wide). This wonderful tree, positioned on the edge of a sunny pond, produces its leaves anew without problems every year – but in June/July the majority of the feathery leaf tips roll up and turn black, yet remain on the tree and do not drop off. A relocation and spraying it with Orthocide fungicide 50, 0.2%, or Dithane Ultra, 0.1% have unfortunately only proven partially successful. This year, I noticed at the beginning of May a stripe, approximately 12 cm in width, running diagonally across the entire plant in a relatively sharp delineation, along which the feathery leaf tips half roll up and discolour to dark grey. This is surely the starting point for the disease. Dear colleague, do you know this problem? If so, I would be delighted if you could provide me with some competent tips.