Asked December 20, 2019, 11:42 AM EST. Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. Blue spruce’s branches are dying; now what? Kimberly Bohn, Ph.D. Former Extension Educator, Forestry and Natural Resources Pennsylvania State University . Videos Length: 00:07:09. Ask an expert. Many of the blue spruce around my house are in sandy soil, they are still dying. Why are My Spruce Trees Dying? How do you know when a blue spruce is dying? I planted a blue spruce in the spring this year I thought a racoon climbed it to reach a bird feeder and killed some branches but it looks like the tree is dying. Appreciate any help. Occasionally, the disease begins higher in the tree, with inner needles browning in the upper branches. I thought lack of sunlight might be the issue for some that have become surrounded by bigger trees but even Blue Spruce's on their own with plenty of sunlight as affected. Twitter Share. The trees are dropping needles fast- this is due to one of several needle-cast diseases. These are gorgeous irreplaceable trees that I'd like to save if possible. The disease, referred to as Rhizosphaera needle cast, is the most common problem seen on blue spruce samples that are submitted to the Plant Disease Clinic. Posted Oct 11, 2020 . Blue spruce trees are also susceptible to Rhizosphaera needle cast, caused by the fungus Rhizosphaera. I planted 2 and the other is thriving. Instructors. Blue Spruce Dying. The disease begins on the tree's lower branches and works its way upward. Hey all - I have many Blue Spruce on my property and all seem to be dying from the bottom up. I have several blue spruce trees in my yard, but over the past couple years the branches starting at the bottom are dying off. What could it be? I water it regularly and live in the midwest Save For Later. Why are My Spruce Trees Dying? Overview. 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