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Why do we care about two beetles? The economic and environmental damage that can come from newly introduced species can overwhelm any cost effective response once the species is established. The emerald ash borer is a prime example of what can go wrong and the extent of the damage when there is no early detection and no response.
U.S. Customs and Border Protection notes that the "invasive species Xylotrechus hircus is an invasive, wood–boring insect pest from the Cerambycidae family of destructive longhorned beetles indigenous to Asia. Longhorned beetles pose a serious threat to American agriculture, to national forests and to the timber industry. CBP issued an Emergency Action Notification and ordered the importers to re-export the container of desulphurization reagent in which the longhorned beetles were discovered. That container was shipped from China."
 Emerald Ash Borer Awareness Week Don't Move Firewood; Save America's Trees http://www.emeraldashborer.info/