Tropicals & Tender Perennials: Ok, I need help again :(, 1 by willow518

willow518 wrote:
I've been noticing that some of my plants are starting to get yellow leaves and dropping off. Not like my Imperialis, I think I have that one figured out. They are all near eachother. My Pubicalyx 'Red Buttons', Camphorifolia, Globulosa, and Fungii in particular. They're getting brown spots that form on the underside of the leaves. Then they eventually get bright yellow and fall off. I haven't had to deal with this sort of problem before. My plants have all been very healthy up until this summer. I'm not sure if it's the extreme heat or what. Is this some sort of fungus? Is there some kind of home remedy that I can mix up here at home and spray on the plants? I've read that Tinactin foot spray can be used, cinnamon and baking soda also. Will anything stop this from spreading and will I be able to save the leaves that are already infected? Can anyone recommend something they have used and has anyone ever experienced this particular situation? Do I soak the entire plant? Or just the soil? Any information would be greatly appreciated. Here is a picture of a Globulosa leaf.
TIA!
Jen