At this time, the Emerald Ash Borer has not been identified in the City of Greeley. Samples from local ash trees will continue to be collected on a regular basis to look for the beetle’s presence.
Signs of Infestation
Emerald ash borer (EAB), Agrilus planipennis fairmaire, is an exotic beetle that was discovered in southeastern Michigan near Detroit in the summer of 2002. The adult beetles nibble on ash foliage but cause little damage, they are metallic green and up to one half inch long. The larvae (the immature stage) feed on the inner bark of ash trees, disrupting the tree's ability to transport water and nutrients. Please note: European Mountainash trees, Sorbus aucuparia, are not true ash and are not susceptible to EAB.
Signs of an EAB infestation include:
- Sparse leaves or branches toward the top of the tree
- Increased woodpecker activity
- D-shaped exit holes approximately 1/8 inch wide
- Vertical splits in the bark
If an ash tree appears unhealthy, consider having it examined by a professional. If you suspect your tree has been infested by the EAB, call the City’s Forestry Program at 970-339-2405.
Managing the Emerald Ash Borer
If the EAB is detected in the City of Greeley, to prevent the spread in Colorado, the Colorado Department of Agriculture will impose and enforce a quarantine on the movement of ash tree products (i.e. chipped wood, branches, logs, stumps and firewood). If that happens, a landfill will be identified for public disposal of EAB-infested material. The City of Greeley Forestry Program maintains an inventory of publicly owned trees and that includes all varieties of ash trees. City staff will immediately begin determining the health of each infected tree located on city property and treat or replace it depending on its health.
Private properties with an infected ash tree larger than 15 inches in diameter and in good health can hire a professional to treat it with insecticide or they can choose to remove the tree and dispose of it in the pre-determined ash tree drop-off site. If the tree is smaller than 15 inches in diameter, residents can choose to treat otherwise healthy trees themselves. If the tree is in poor health, it may need to be cut down and taken to the disposal site. Keep in mind that it could take up to three years for a tree infected with the insect to show signs of decline, so regular checks are recommended.