Thanks everybody for your input. I DO use a palm fertilizer on all my palms on a quarterly basis. Guess I should have been more specific. This particular Robellini has 5 trunks and only the central growth area on ONE of the trunks is doing this. The others appear to be normal/healthy. Go figure.
Cher....I've seen pix of palms w/"frizzletop" online, but that's not what mine looks like. I DO appreciate your research on my behalf though. Thanks!
Guess I'll just keep an eye on it. Already checked for critters and haven't found any so far.