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Thanks "Greenhaven" and Oscar for the diagnosis. It looks like here in Florida there's less concern. A Master Gardner's post, "Fungicide application is often not necessary as the disease is seasonal and quickly passes." But I'm going to hunt down a proper fungicide for "rust disease". If for nothing else but to protect all the different jaboticaba's I have in the yard.http://lee.ifas.ufl.edu/Hort/GardenPubsAZ/GuavaRustHomeowner.pdf