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City of Warrenville
28W701 Stafford Place
Warrenville, IL 60555
Ph: 630-393-9427
Insect Infestation
Emerald Ash Borer (EAB)
Emerald Ash Borer
The City of Warrenville has confirmed an infestation of the Emerald Ash Borer (EAB). The EAB is a slender, elongated, bright green beetle that kills white, green, black, pumpkin, and several horticultural varieties of Ash trees relatively quickly when infected. Within several weeks, larval feeding creates S-shaped galleries in the tree’s inner bark that wind back and forth. The tree declines in the second growing season and is usually dead by the third. Infestation signs include dieback, sprouting, D-shaped exit holes in bark, and heavy woodpecker damage.

Although chemical and biological controls are being researched, more aggressive containment and eradication efforts are necessary to avoid new outbreaks.

The City has adopted a policy to remove and replace dead Ash trees in City parkways free of charge with an alternate City-approved tree species. The City Council’s current policy is based on research conducted by the City’s Environmental Advisory Commission and Public Works Department, which considered potential negative effects of insecticide treatments on the environment, weighed the cost of treatment over an extended period of time, and recognized that insecticide treatment is not guaranteed.

Although the City Council determined that the City will not take any action for infested trees on private property, it is important to note that if you have an Ash tree in your yard that exhibits little or no signs of canopy decline, you may still have time to investigate the ongoing costs, potential health risks, and success rates of using insecticide treatment in an attempt to save your tree, with the assistance of a trained arborist. Treatment or removal of trees located on private property is at the cost and discretion of the property owner. Since the City of Warrenville does not have a certified arborist on staff, private property owners can contact the local University of Illinois Extension office to obtain a list of certified arborists, as follows:

1100 E. Warrenville Road, Suite 170
Naperville, IL 60563
Phone: 630-955-1123
FAX: (630) 955-1180

For more information, including insecticide options for treating Ash trees, a homeowner EAB treatment guide, as well as a schedule for EAB homeowner management seminars, contact the Illinois Department of Agriculture at (217) 782-2172 or visit their website at Additional information on the EAB can be found at or by calling the national EAB hotline at (866) EAB-4512.

The City of Warrenville does not have a mosquito abatement program. DuPage County and DuPage Forest Preserve District typically monitor the mosquito population with an emphasis on the Culex mosquito, carrier of the West Nile Virus (WNV). Both entities have placed monitoring traps throughout the County to pinpoint hot spots at high risk for WNV activity. Once identified, those spots will be targeted for larvicide treatments.

Beginning every May 1, DuPage County collects and tests dead birds for WNV. Residents who discover dead birds during the summer months can contact the nearest public health center located in Wheaton at (630) 682-7560 or visit their website. Residents may also dispose of a dead bird by double bagging it and putting it with their regular trash. A dead bird reporting tool can be found on the DuPage County Health Department's website at:

The DuPage County Health Department offers an alert system to educate the public about the potential risk of contracting WNV. This alert system, known as the Personal Protection Index (PPI), is part of an aggressive public health education campaign targeted toward WNV prevention. The PPI will alert residents of WNV risk level and advise them of the precautions they should take to protect themselves and their loved ones.

Gypsy Moth
Gypsy Moth
Gypsy Moth
Unfortunately, the Gypsy Moth has found its way into Warrenville. The Illinois Department of Agriculture (IDA) has sprayed for Gypsy Moths over the last few years. About 200 acres of infested sites have been treated with an application of BTK, a naturally occurring bacteria used by gardeners as an environmentally friendly alternative to chemical pesticides. About 600 acres in Warrenville were flaked with Disrupt II Pheromone, a synthetic hormone that helps reduce mating among the moths. For more information and to view treatment maps, contact the IDA at 1-866-296-MOTH (6684) or visit