Norwegian Maple

I planted a young Norwegian Maple about three years ago and always had lovely bronze foliage. However, this year I noticed it was covered in ants and eventually the leaves went very dry and white and fell off. Any advice would be greatly appreciated - do you think it was the ants farming the aphids or a fungal infestation?? What can I do to prevent this next year? Thanks
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OK, thanks Logan, I thought that might be the case ..... I will spray next year and perhaps look at putting down some ant killer as well.