How To Fight Sabal Palm Tree Fungus Problem

Question: A Sabal palm on our property started getting yellow spots all over the older fronds about 4-5 months ago. It has progressed so that the older fronds are dying and dropping off and even the new growth shows signs of this yellow spotting, which seems to eventually cover the entire frond. There are 2 other plams about 10-12 feet away that seem to be unaffected. These plams have been here for 24 years. This is Ocala, Florida. Now the tree, in the part below the growth (where the older fronds have been cut off) appears to have a mold or fungus (white/yellow) on it.

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