I've got three Photinia fraseri trees in my yard in Tucson, Arizona. They were planted last May (2013) and now in September (2014), one of them is turning entirely brown and losing all its leaves (over the course of the past month or two).
The branches are still soft, so I don't think it's dead (yet). Is this a disease?
The other two trees seem to be doing much better and they're all on the same irrigation schedule, etc.
(The black marks on the bark are from Spectracide pruning sealer applied after planting because the support post had damaged some of the trunk/branches prior to planting.)
Whatever happened to that first tree looks like it's starting to slowly happen to the tree next to it. I used a cheap soil test-kit -- and it appeared as if the pH was slightly high -- so I've been trying to flush the soil with some long, deep waterings (although it doesn't seem to be helping).
Um, what is up with moderators coming in and changing the content of our posts? That change mis-characterized the time frame I was describing -- not 4 months, but 16 months. Please refrain from the gratuitous grammar corrections ("3" vs "three", really?). There's already an exchange for that: http://english.stackexchange.com.