Blue Spruce Tree Needles Turning Yellow, Brown, Then Dropping? Unlike other needlecasts we find on spruce, the brown needles killed by Lirula can remain attached for several years. Inner needles first become discolored in late summer, turning from green to yellow and brown. The brown needles eventually fall off, leaving bare branches. New or older needles eaten 3 . Lirula needle blight is caused by the fungus Lirula macrospora. Well, unfortunately more effects from this summer's hot, dry conditions are being seen; this time in a tree we traditionally have considered very drought tolerant- spruce. This is also known as leaf burn or desiccation. New or older needles discolored 4 Spruce needle rust. Needles turn purple or brown in color and eventually fall off. The disease begins on the tree's lower branches and works its way upward. There are all manner of reasons why a spruce tree's needles turn brown, from sawflies and budworms to fungi, viruses, mites and bad weather. Needles of infected trees remain attached to the tree, which is largely brown … Blue spruce trees are also susceptible to Rhizosphaera needle cast, caused by the fungus Rhizosphaera. Lirula needle blight can infect white spruce (Picea glauca), including Black Hills spruce and Colorado blue spruce (Picea pungens). I have noticed a few things in general, however. The key is whether the tree is replacing those lost needles … Last year it started to die from the top down and now is maybe 1/3 to 1/2 dead looking.I cannot easily get to the effected area. Hosts include Colorado blue spruce (Picea pungens), and white spruce (Picea glauca). When it does, the tree isn’t able to access the water and the needles begin to turn brown. My tree man said he thought it was from the drought in our area. I have a blue spruce that is about 40 years old and maybe 30 feet tall. During the winter, the soil often gets so cold that the water in the ground freezes. What does this do to spruce trees? Mainly older needles discolored 6 Fungal needle casts. Many homeowners have found spruce needles turning brown and falling, leaving behind branches completely bare on trees that were completely filled-out and healthy this spring. White spruce, including Black hills spruce, is a more susceptible species. The damage I see is, needles turn brown and fall off. This is a very common fungus that affects … About 24 months after infection, Black Hills spruce needles are almost all reddish-brown and turn light tan over the course of the next few months. Needles often develop yellow bands, which eventually turn purple and finally brown. If you think your tree is infected, look for small black spots lining the needles with a magnifying glass. Needles on branches above snow line turn brown. S. pruce budworm. Yellow-headed spruce sawfly. If you notice leaf burn on your evergreen tree, the very first step you will need to take is to diagnose the problem. 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