The yellowing of needles of evergreen trees may be caused by a number of different problems. Principal among these could be early-stage insect infestation such as mountain pine beetle, ips beetle or spruce/fir budworm; needle casts or related fungi; reaction to outside influences such as chemicals; or it could be natural regeneration. For specific information and treatment assistance, contact your local Extension office listed at: Extension Office Directory.
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I live in Colorado. What is wrong with evergreens whose needles are turning yellow; can the problem be treated?
Last Updated: November 14, 2011
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