Ficus Nitida leaves turning brown
We've had a big luscious Ficus Nitida in our back yard for years. It froze during the 2007 freeze, but came back strong and has been doing great. Just prior to THIS year's freeze, I noticed that the leaves were beginning to turn brown on the edges and fall off. Then we had the freeze and we lost all the leaves. We had it trimmed back (like we did in '07). New growth is appearing, BUT these new little leaves are also turning yellow and brown.
We fertilized it a couple of weeks ago right before that good soaking rain - this was BEFORE the new growth started appearing. I don't think the browning is due to the fertilizer because it was happening prior to the freeze. Anyone have any thoughts? I'd hate to lose such a great shady tree.
In addition, one main limb has small round holes evenly spaced a few inches apart. I was told it was a borer, but I haven't actually seen one. What to do?
I live in Northeast Phoenix.