By Deggs
United Kingdom 
hi my japenese acers have rust all over what causes this /and how do we treat this problem tnk you
5 Sep, 2014
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I'd like to see a photo of the affected plants - rust is not impossible in Acers, but is certainly uncommon in Japanese Acer. They're more usually affected by scale infestation or die back than rust.
5 Sep, 2014