Aloha Howard

Some types of rust fungus (Puccinia species) induce a combination of a
floral-like appearance of the infected leaves, a sweet pungent odour and a
fructose-rich secretion.  Presumably the fungus gets efficient dispersal out
of the deal.

Here is one PDF where you can read more online, discussing Puccinia on
plants in the Brassica family:

http://chemicalecology.psu.edu/JournalClub/Raguso&Roy1998%20rustmimicry.pdf

I don't know the species of fungal pathogens on Plumeria, but it seems
likely that something similar is going on here.

best wishes

Gavin.

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