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Destructive wood boring insects have been found in artificial Christmas trees that have real wood trunks with bark attached. Our Christmas trees do not use wooden trunks and won't endanger trees in the US with dangerous insect pests.
These insects are Callidiellum villosulum and Callidiellum rufipenne, also known as brown fir longhorn beetle and Japanese cedar longhorn beetle. These insects are related to the Asian longhorn beetle which is currently being eradicated in Chicago and New York City.
There are no treatments that will kill these insects once they attack a tree. The tree must be cut down and the wood destroyed.