I've read up on this orange fungus that's been all over my plumeria. It seems that it's a rust fungus :( aka Coleosporium domingense, it won't affect the flowers of the plant but will continue to eat away at the leaves and can easily spread to surrounding plants! EEEK! I just planted my first raised bed garden with cucumbers and tomatoes very close to my plumeria. I really don't like using chemicals in the garden, but I think I'm going to buy some rust fungus spray to keep it under control.
After closer inspection to the surrounding plants, it looks like the milkweed has got it too! Nooooo! :(
I carefully removed any leaves at were contaminated and threw them away in a separate garbage bag. A lot of the plumeria leaves still have trace signs of the rust. I'm hesitant to cut off all the leaves, but I know it'll just keep spreading if I don't. Oh, the trials and tribulations of pruning!