I have a few very large Blue Spruce trees in my yard. Over the past year they have been loosing needles from the inside out (trunk to the outer branches) very rapidly. Needless to say I had a tree guy come out to look at the trees and he said they have something called "needling" or "needle cast"... He advised that the trees needed to be sprayed 3 times a year at a cost of $250.00 per application. There are 7 large Blue spruce and each is about 30 feet tall. Is anyone familiar with "Needle cast" when referring to pines? Is spraying my only option...? I cannot afford $750.00 per year to keep these trees alive.