Emerald ash borer (EAB) is an insect native to Asia. It was introduced into North America sometime during the 1990s.
EAB attacks and kills all true native North American ash trees, including green, white, black and blue ash, and their cultivars, including “autumn purple ash,” a popular white ash variety in Colorado. Although rare in Colorado, white fringetree also has been documented as susceptible to EAB.
This pest kills stressed and healthy trees and is so aggressive that ash trees may die within two years after they become infested. It is possible for EAB to infest an ash tree for up to four years before visible signs of decline in the tree occur.
EAB now poses a serious threat to Colorado’s urban and community forests, where ash trees comprise an estimated 15 percent or more of all trees. The Metro Denver area alone has approximately 1.45 million ash trees, which provide an estimated $82 million annually in services including stormwater mitigation, energy savings and increased property values.
For communities on Colorado’s Front Range and northeast plains, it’s only a matter of time before this pest will arrive. Without ongoing treatment, any infested tree will die.
The above information is taken from the Colorado State Forest Service website. For the most current and comprehensive information, please click below to READ MORE.