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City of Warrenville
28W701 Stafford Place
Warrenville, IL 60555
Ph: 630-393-9427
Insect Infestation
Emerald Ash Borer (EAB)
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
https://web.extension.illinois.edu/dupage

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 www.agr.state.il.us/eab/index.php. Additional information on the EAB can be found at www.emeraldashborer.info or by calling the national EAB hotline at (866) EAB-4512.

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 https://www.agr.state.il.us/Environment/Pest/gypsymothinIL.html