Emerald Ash Borer

A good deal has been learned about treatments to save ash trees since EAB was first discovered in 2002. There are do-it-yourself treatments and there are professional treatments, with one in particular, that is administered every two years.

What is not known is how long the commitment is for continuing treatments. Specialists have stated for 6 years, 10 years, 15 years, and some state that treatments will need to be continued for the life of the tree. The one aspect that everyone can agree on is that there is no guarantee that the treated tree is 100% invulnerable to EAB.

The City of O'Fallon will continue to offer yard waste pickup to residents who sign up for it. This includes wood waste, from O'Fallon's residents through the current program with O'Fallon's Environmental Services Department. Please note: wood debris picked up through the program must meet all of the guidelines for yard waste pick up.

No. The City of O'Fallon can not dispatch staff to diagnose EAB activity. Although this may sound abrupt, O'Fallon does not have the staffing capabilities to diagnose all of the potential requests to diagnose EAB activity. The face of the matter is that EAB is in the area and every ash tree is vulnerable, therefore if an ash tree appears unhealthy it likely is infested with EAB and a diagnosis is unnecessary.

The tree will die a slow death as the EAB literally eats the tree just under the bark. Tree owners will first notice branches or tree sections dying over a year or two. After that, the tree will fight to survive by sprouting suckers on the largest branches and at the base of the trunk. This sucker growth is a sign that the tree is in the final stage.

Ash trees that have died from an EAB infestation are particularly brittle. If dying trees are left standing and subjected to high winds or an ice storm, the result could be a catastrophic drop of limbs and in some cases entire trees. Considerable damage has been suffered by houses and vehicles beside the dying ash trees, and neighborhood power outages become common from ash limbs dropping onto electric lines. The City of O’Fallon is recommending that residents have ash trees removed when the trees are showing 50% death of the tree structure. The 50% criteria coincides with research that demonstrates when an ash tree is subjected to this amount of decline, the tree’s fate is irreversible.

O’Fallon has begun taking measures to proactively replace ash trees on city property. The decision was made to apply the city’s resources toward replacement of ash trees with other species and forego attempts to treat existing ash trees. Long term success with treatments to control EAB remains a gamble. Proactive tree planting in 2015 through 2019 will soften the transition of the expected ash tree loss.  Planting replacement trees began in January of 2015 with the intention of having a net gain in the total number of trees after the last ash tree is removed in 2021

The City of O’Fallon encourages every resident to plant trees in advance of the EAB devastation, even if the residents are not going to lose an ash tree.  Trees are good for our community and every effort should be made to add trees and buffer the impact of the EAB.

• Residents and business owners are responsible for ash trees on their property. This includes trees growing between the sidewalk and the street. The City of O'Fallon recommends that property owners take this into account when assessing the upcoming EAB problem and make plans accordingly. This situation also lends itself as a topic of discussion for Home Owners Associations in which subdivision trustees may begin budgeting the removal of the ash trees and replacing the ash with another species, perhaps drafting and funding a five year plan for the subdivision.
• Ash trees on municipal properties are the City of O'Fallon's responsibility.