Borers in Young Tree: Treat or Replace?
I have a lacebark elm that was planted just under a year ago and is approximately 12 feet tall. A few months after it was planted, I contacted the nursery because I was concerned about the ends of the branches losing their leaves (from the tips down the branches about a foot or so). An employee took a look at the tree and said the leaf loss was normal considering the extreme heat. I watered the tree religiously every other day throughout the hot summer (using a tree gator).
The tree wintered over and has greened back up, but the ends of the branches never got any leaves. A few weeks ago, I noticed a scar in the bark. The bark peeled back easily and behind it was a bunch of oval holes. I called the nursery again and the tree was diagnosed with "borers." They didn't specify what kind and I haven't seen any beetles around the tree. The nursery injected insecticide into the soil but I am concerned that the tree won't recover and will instead just die slowly.
If it were your tree, would you go ahead with the treatments, or would you have the nursery replace the tree? It is still under warranty.