I have eight 6-7 feet tall Dwarf Aberta Spruce trees with patches of lighter green showing up last fall, I wasn't concerned, because they didn't look bad, the color variation made them look even prettier, I didn't know it's a problem until now these patches are turning yellow over the course of a year. I was told that there are no mites, most likely it's a root rot problem, because the ground would heave a little when trunk being rocked back and forth, which I was told shouldn't happen for long established trees-- the trees were planted 12 years ago!

Is there anything to do to save the trees? I've had two local tree care professionals taking a look, none has any idea what happened and what to do.

I don't know if I can attach photos here, I have a taken a few pictures but couldn't figure out how to attach them with my message...