The Emerald Ash Borer (EAB) is an invasive beetle that threatens to kill 15% of Denver's trees – some 330,000 ash trees that line our streets and shade our yards. That’s an annual value loss of $18.3 million in environmental benefits provided by trees, including cleaner air and water, absorption and storage of greenhouse gases, flood control, enhanced property value, wildlife habitat, energy conservation, cooling of the urban heat island, and a host of physical, psychological, and social benefits.
EAB has killed 50 million trees in 28 states in the East and Midwest, costing communities billions of dollars in tree treatment, removal, and replacement.
The tiny green beetle was first discovered in Boulder in 2013, where its spread is extensive. It was detected in Longmont in 2016, and, while it has not yet been discovered in Denver, many experts believe it is likely already here.