What is the emerald ash borer?

The emerald ash borer (EAB) is an insect that has found its way into the O’Fallon community in the spring of 2014 and will create an infestation that is fatal to all species of ash trees. The EAB will spread through the community and begin killing only ash trees during the next eight years.

There are possibly 37,000 ash trees in the O’Fallon community that are essentially doomed to die from the Emerald Ash Borer infestation by the year 2022. It is essentially unstoppable and it has devastated ash trees over much of the country, starting in the Northern states. Eventually, the EAB will hit communities all the way to the Gulf of Mexico. It is just beginning to reach the City of O'Fallon.

Emerald Ash Borers leave a very distinct hole in a trees' trunk; note the half circle shape.
Emerald Ash Borer on top of a copper penny for size comparison
Dead and dying ash trees pose a risk from their falling limbs.
Closeup photo of an emerald ash borer

O’Fallon EAB:  Five Things to Know

  • Residents and businesses are responsible for tree removal on their property including trees between the sidewalk and the street.
  • O’Fallon staff will not diagnose EAB activity.
  • Remove ash trees when the tree reaches 50% dead or sooner if possible.
  • Residents can use O’Fallon’s yard waste program for disposing wood waste.
  • The City of O’Fallon encourages residents to plant trees where ever possible and as many as possible, even if you are not losing an ash tree.

Frequently Asked Questions about the EAB

Can ash trees be saved from this infestation?

Can I dispose of the tree with the City?

Should I call the City if I think my ash tree has been infested?

What happens to a tree that is infested?

What is O'Fallon doing about the EAB?

Who is responsible for these ash trees as they deteriorate?

Additional Resources

For additional information on the emerald ash borer, please check out these websites: