Sorry dark, couldn't help myself. No harm meant. :)
That kind of sudden drastic change does lead one to suspect foul play under the circumstances. If you think that some kind of chemical was dumped in the soil then trying to flush the soil with lots of water might help, but I'm no expert on...
I don't really know. If that is scale, then they are probably a secondary problem, and the primary problem is some other stress that the tree is under. I doubt the scale is the prime reason for the tree's decline.
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