More than one year into an ambitious citywide campaign to prevent an outbreak of the invasive emerald ash borer, Denver officials still have not detected any traces of the tree-killing insect in the metro area — so far.

“If you talk to any arborist or tree expert in the country, they say that eventually the ash borer will move into the Denver metro area,” warns Rob Davis, city forester for Denver Parks & Recreation. “The time to start treating trees is now.”

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