Black spots on tropical hibiscus

Saint Peters, MO

I have 5 tropicals that I bring in for the winter. I've done this for years and have never had a problem. Now one of them has a bunch of leaves with black spots on the undersides. One other one is getting them. I've looked around and can't find a certain answer as to what it is or what to do about it. Any help is appreciated.

Thumbnail by GardenJeanne

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