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Common rust disease causes premature leaf drop of frangipani (plumeria) plants.

A rust (fungus) disease, Coleosporium plumeria, defoliates many varieties every year.
Top photo: The rust disease coats the underside of the leaf with orange pustules and causes leaves to turn yellow, then brown and rapidly defoliate in September-October.                                                                                                                                          Bottom photo: Powdery mildew of ‘Bridal Bouquet’ plumeria.


Read more on susceptible frangipani  varieties, click here
Frangipani pests, article by Doug Caldwell, click here
A recent report on powdery mildew of Bridal Bouquet frangipani, click here