I have a large beautiful spruce tree that started losing needles last fall.  The condition is now worse with a section now bare.  The needles first turn brown and then within a week to 10 days fall off.  An arborist looked at it this spring and said it was a lack of sunshine in the affected area.  I had a neighboring tree cut and thinned to allow full sun but this fall the branches with and without sun are impacted. I had a second opinion today but they had nothing to suggest except to ask you.   HELP!  Many thanks.