Hi, Jaila, and welcome to NGA.
I'm in Vero Beach and have lots of plumeria, some 250 potted and several dozen in the ground. I've grown and propagated plumeria for 25+ years. Did you mean to say that some sort of "expert" actually said to destroy plants with rust on their leaves? If so, that's simply ridiculous. First off, rust is a fungal disease and doesn't kill plants. It's ugly and causes the leaves to yellow and drop. Over a 2 wk. period, I've removed probably a 55 gal. bag of leaves (and trashed them). Now I have plants with few leaves and with smaller leaves. I then spray the underside of what leaves remain with a fungicide. I'm using Daconil. Hopefully, that spray will contact what fungal spores remain and kill them. This technique seems to work for me, but as I said, I have many times more plants than the average grower.
