Ask-a-Dave's-Gardener: Mohave Pyracantha (Firethorn) Dying quickly-help!, 3 by ChaddsFordland

ChaddsFordland wrote:
I planted 16 Mohave Pyracantha (Firethorn) in ~ April 2015 parallel to the road line. So these are not fully grown. Within the last 2 weeks I noticed that one of them is turning all brown. Pics attached. The Pyras on either side are absolutely fine (all green), as are the other ones in line I am a beginner gardener, but from the pics I have seen, this does not look like fire blight (?). It may be too late to save this one, but I am concerned about losing more. Any suggestions?