The bottom half of my (large, established) spruce tree looks dead, with zero green on it. I'm guessing its some type of Spruce decline/infection. My question is, in Spruce Decline, generally, are these branches actually dead? if I go through the process to find out the exact cause of the ailment/treat it, do these branches spring back to health?
I'm wondering if it is worth it to go through the process to treat it since so many branches look 'lost'.
Additionally, I have two pine trees next to the Spruce. Can spruce decline transfer over and infect pines too? Or are these ailments pretty specific to spruces?