Answer: It's difficult to diagnose a problem without actually seeing it so I'll offer some expert observations. Palms do lose their lower fronds so if the frond is one of the older ones, it's a normal process. If the affected frond is one of the newer ones, it could be sunscald or a fungal disease, or even a response to being transplanted into your landscape. I don't think it's anything as serious as bud rot. When this happens, new fronds are affected and the entire frond dies.
I would prune away the affected frond to make the plant look more attractive.
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