Spruce with Spider Mites
The house/yard we purchased a few years back included an ~55' tall blue spruce (Colorado or Engelmann). Concentrating on getting new landscaping established, I didn't notice problems with the tree until a kind neighbor pointed out some damaged or dead limbs.
All signs point to spider mites. The simple home-garden counter-measures I've read about (e.g. hosing off the plant, spraying with soap solutions) don't seem like they'll work for a tree this size. There are supposed to be predator insects that are effective and that don't cause other problems.
Anyone have success in dealing with spider mites on a large tree?