Emerald ash borer found in Berthoud, Colo., prompting warnings to halt moving ash wood and report signs of infestation.

The emerald ash borer, an invasive beetle that kills ash trees, has been detected in Berthoud, Colorado, marking its first confirmed presence in the city. The discovery, made during a routine survey, raises concerns about the spread of the pest to other parts of northern Colorado. Authorities are urging residents to avoid moving ash wood and to report any signs of infestation, such as D-shaped exit holes or canopy thinning, to help slow the beetle's advance.