Archontophoenix cunninghamiana one sided browning

[Jesse]

I have done a lot of searching over the past week and so far have come up empty.  I apologize is this has already been covered.

This year I planted multiple triple kings in my front yard.  Almost all of them appear to be taking off.  One of them seems to be having problems.  I lost one tree out of a triple in about a month due to what I think was pink rot.  All the fronds turned rust brown within a month, the two spikes it was pushing stopped growing, and the trunk sucked in.  After about another month with no progress I ripped it out to make my triple a double which is when I noticed the salmon colored powder that was living inside the crown.  I have done my best to clean all my tools and resist the urge to cut off anything that was not brown.

I'm concerned I might be loosing another one out of the triple.  This week the lowest leaf (yes the one that already looked horrible) showed one sided browning. 

Yesterday I applied the Scotts lawn fungicide as recommended for pink rot however I would ignorant if I assumed it was that simple. 

Anybody know for sure?  Could it be something else? TIA

P.S.  I hope the King palm Christmas lights aren't Taboo.

[NorCalKing]

That looks like frost damage from a previous time, to me.

[Chris Chance]

Than salmon color is called pink rot. Resist the urge to pull off the leaf bases and let them fall on there own. Pink rot will kill palms in a hurry and the easiest way to get it is exposing the tissue. Also hitting them with fungicide never hurts. I wouldn't worry about that lower leaf turning brown like that. Just make sure the rest are staying healthy,

Also the Christmas lights will warm the stem a bit so no Taboo there haha.