I live in Virginia (hot and steamy in summer) and put my frangipani (Plumeria) outdoors for the summer. It appeared to be thriving until late summer when I noticed that the backs of all the leaves were covered with orange fungus-like spots. I'm too scared to put it in the greenhouse with my other tropicals if it's diseased. What to do ? Will Neem Oil fix it ?
If they look like this, I'm told it's rust. The advice I got when I posted to my blog about it was to remove affected foliage and spray the plant with a fungicide. Neem is, I think, supposed to have fungicidal properties, so it may well work. Alternately, you could just let it defoliate and go dormant, too. I doubt putting it in the greenhouse would hurt anything: if your plant caught rust from spores floating around in the air, the same spores are already in the greenhouse anyway.
