What killed this phoenix palm?

[Sandy Loam]

What killed this (former) phoenix dacytylifera or phoenix sylvestris?  (see photo)  Is there any way to tell?  I am curious to know so that I can identify how palms are killed depending on their appearance, and which spores might be floating around in my vicinity.  I can't tell the difference between fusarium death, ganoderma death, "Texas Phoenix Palm Decline" (TPPD) death, and weevil death.  Thank you for your identification efforts.         

[kinzyjr]

@Sandy Loam Being that you are geographically not very far away, I'd venture that it is fusarium wilt.  We've lost a ton of Phoenix down here due to this disease.  A lot of washingtonias have been kicking the bucket lately, seemingly from a different flavor of the same disease.  Fusarium is a little more easily diagnosed by its symptoms, but a confirmation requires a lab test.  This article might help with fusarium wilt ID:

http://edis.ifas.ufl.edu/pp139

The main culprit is supposedly uncleaned pruning tools.  That might be why the city has lost hundreds of palms.  The companies they hire to prune palms aren't going to sterilize their equipment after each plant, so they end up spreading the disease.  A number of landscaping companies have stopped here to ask if I would like them to trim my palms, and each time they are asked to not touch a single leaflet on their way out of the driveway.