I know that Sweet Scarlet has very dense foliage as do most dwarfs. You should prune out some of the leaves that are touching one another to open up the plant if necessary. Also look at the other plants density of growth to see if it is inhibiting air flow while you are noticing the soil. Powdery Mildew is spread by spores. It is possible for the soil to have the spores, but more importantly is keeping conditions unfavorable for them to grow. Keep plants pruned and spaced well apart. Keep the humidity as low as possible. Keep fans or doors open to facilitate ventilation.
Marks link is a very good reference. There are other sites listed at the top of the disease forum that are also quite good. Read what you can and then we are here to help you too.
Regards ~ Patti
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~ Patti ~
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