Emerald Ash Borer

Emerald Ash Borer Overview
The emerald ash borer (EAB) is a small metallic green beetle native to Asia. It was first confirmed in Roselle in 2010. The adult emerald ash borer emerges in May-June and the female lays eggs in bark crevices and between layers of bark. The eggs hatch in one to two weeks and larvae bore into the tree where they chew the inner bark and phloem, creating serpentine galleries as they feed. This cuts off the flow of water and nutrients in the tree, causing dieback and death.

Tagged Ash Tree EAB Management Plan Established in 2011
The Village of Roselle began treating 640 publicly owned ash trees in 2011 as part of an Emerald Ash Borer Management Plan officially adopted by the Village Board. These trees, which represent approximately a third of the publicly owned ash trees in the Village, are being chemically treated with soil drench and trunk injection imidacloprid treatments by certified arborists from Emerald Tree Care.

Following the confirmation of the presence of emerald ash borer (EAB) in Roselle in 2010, a "stem by stem" tree inventory was to provide data for the development of an EAB management plan. Representatives from Graf Tree Care, a St. Charles based company that employs certified arborists who specialize in conducting tree inventories and developing EAB management plans, visited every tree on Village owned property to collect data, including tree species and condition of the tree.

Of the 1,774 publicly owned ash trees in the Village, the 640 selected for treatment were identified as having the highest condition ratings, highest location values, and the lowest risk for failure after treatment. These ash trees are the healthiest, and therefore, the most cost-efficient trees to treat. The ash trees on public property and in the parkway (typically located between the street/curb and the sidewalk) not slated for treatment are being removed as they decline, with reforestation efforts to follow.

The location of the publicly owned ash trees included in the treatment group is available for download here (PDF), and the treated trees have been tagged with an aluminum marker.

The ash tree treatment program involves a multi-year effort that cost the Village $26,926 during the first year. At an average of $42 per year to treat each of the ash trees in the treatment group, it is estimated that if left untreated, the eventual removal of these trees would cost over $1,000 per tree. While many surrounding communities are opting not to treat any of their ash trees, the Village Board recognizes that trees are a part of the infrastructure in Roselle, and made preserving the tree canopy a priority. EAB has been identified in all of the communities that surround Roselle. Estimates call for all untreated ash trees to be killed by EAB within seven years. Reforestation efforts following ash tree removals are yet to be determined.

Residents should be aware that Village ordinances do not allow anyone other than the Village or a person hired by the Village to treat, trim, remove or otherwise disturb a publicly owned tree or shrub on any street or other public property without first filing an application and procuring a permit from the Public Works Department. Residents who would like to treat a publicly owned parkway ash tree in front of their home that is not included in the 640-tree treatment group must first download and submit an Emerald Ash Borer Chemical Treatment Application.

The Village will not inventory or survey trees on private property, but residents may elect to hire a certified arborist to assist them with tree concerns on their property. Additionally, Village ordinances that regulate tree infestations allow the Village Forester to enter private property to inspect trees. If the Village Forester determines that a tree is infested with EAB, it will be declared a public nuisance. Upon notification, homeowners will have 14 days to remove and chip the tree. If the tree is not removed after the 14-day period, the Village will remove the tree and bill the homeowner.

For more information, visit the Emerald Ash Borer Information website or contact Village Forester Mike Schulz at (630) 671-2368. For more information about Graf Tree Care (www.graftreecare.com) or Emerald Tree Care (www.ashborer.com), please visit their websites.

Crown Dieback Signs and Symptoms
The most visible sign of infestation is tree crown dieback, which appears after the first year. Branches at the top of the crown die, with more branches dieing in subsequent years. Typically, the tree will completely dead in about three years. Adult beetles emerging from trees leave a very small, 1/8 inch diameter "D" shaped exit hole that may appear anywhere on the trunk or upper branches.

Ash Tree Treatment
Treatment options, including insectide treatments (imidacloprid) before and during infestations, are available through private certified arborists. If treatment is deferred, infested trees will likely die and need to be removed.

With ash trees lining many streets including Cherry Street, Lakeside Drive, and Brandywine Drive, many trees in Roselle are ash trees. One solution to minimize emerald ash borer infestations in Roselle is to not bring firewood from the outside community into Roselle. Emerald ash borers can easily be transported in ash logs, so purchase firewood locally from a known source.

To learn more about the emerald ash borer, visit the Emerald Ash Borer Information web site or contact Village Forester Mike Schulz at (630) 671-2368.