The rust colouring doesn't seem to come off. When I rub a paper towel on it, the loose lighter coloured flecks come off. I have to rub really hard to get a rust colour on the towel. Hard enough that the leaves are damaged, so I think I'm actually transfering leaf cells.
I tried using a pest spray yesterday. I'm trying to get some neem oil just in case. I've been using Physan because it reminds me of rust fungus that I sometimes get on roses. Any other suggestions to try? These plants are two of my "originals" and I'd really hate to lose them.
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