14+ Blue Spruce Turning Brown And Losing Needles. In general, the needles on a colorado blue spruce last eight to 10 years before finally turning brown and dropping. Are your blue spruce needles turning yellow, brown and then dropping?
Are Your Evergreens Looking Yellow Or Brown This Might Be Why Fort Collins Nursery from fortcollinsnursery.com
Cankers are also prevalent as are mites. If many branches on the tree have needles that are turning yellow or brown and dropping, the cause may be rhizosphaera needle cast. The red color on the needles of the blue spruce will typically occur in august followed by a browning and then dropping of the needles.
These can be detected by looking for a fine webbing between needles, and by holding a white piece of paper under a branch and shaking vigorously.
I planted three blue spruce two years ago and they have been doing very well untill this year. The fertilizer will replace the depleted iron and help the needles. Next, spider mites can turn a blue spruce red, so to speak, but these usually come note that mite attacks impact the whole tree. I did find three caterpillars on one of the trees this.
