I have a grove of black hills spruce that were planted in 2008. 3 of the 50 trees are starting to look sick. I have pictures attached. It is not the entire tree, but portions of it that are turning like a lime green color, then yellow, and then finally brown. The other thing that is noticeable is that the individual limbs towards the outside are all drooping and seem to have no upward strength to them. We are in central MN and the rain this year has been incredibly great! Is there anything you can think of going wrong here or more importantly anything I can do to prevent losing my trees?