This decent article from U.S. News & World Report describes the problems caused by non-native forest pests that attack trees. There's a little bit about the acoustic detection system being used to find Asian longhorned beetle larvae (Anoplophora glabripennis) boring inside trees; you can find more detailed information about that here. More important is the section of the article describing the lack of manpower, funding, and legislation that keeps the U.S. from properly monitoring the importation of items packed in materials that can contain dangerous pests.
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