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Chicago Emerald Ash Borer Central

Latest Emerald Ash Borer Information

Watch for Emerald Ash Borer

Posted by Ron Wolford -

With the recent identification of Emerald Ash Borer in two more counties, LaSalle and DuPage, it is good to be watchful for the new pest throughout northern Illinois", says John Church, University of Illinois Extension Educator, Natural Resources, Rockford. The Emerald Ash Borer has been found in several other communities over the past year, primarily in northeastern Illinois. The Emerald Ash Borer only affects ash trees, unlike the Asian Longhorned Beetle which was a new devastating tree pest found several years ago and infested more than 10 types of common shade trees.

"One of the major helpful things that individuals can do to help reduce the spread of the pest is to use local firewood and do not transport ash products from fresh wood," says Church. Don't bring in firewood or other ash wood products from infested areas or from a long distance.

Human transport is suspected as the major method of the borer's spread as it does not move on its own very rapidly. If camping in infested areas, leave unused firewood at that site. If buying ash firewood, be sure of its source.

Areas identified with the Emerald Ash Borer are officially quarantined to restrict the movement of wood, wood products and the borer. However, individuals can follow similar guidelines voluntarily to help prevent the spread when in non-quarantined areas as well.

With new sites being found, it is a good time to be a good observer and scout for the borers and their damage. The borer lays eggs in the bark of the tree and when the borer hatches, it will tunnel under the bark and start feeding on the sapwood of the tree, leaving serpentine trails shallowly under the bark. Also, small D-shaped holes in the bark are also a clue, which are left by adult beetles leaving the sapwood. No other insect creates the BB-size D-shaped holes on ashes. Evaluating wood or trees prior to cutting for these exit holes is important as it is one of the signs of infestation. Peeling back the bark may also give an indication of trails and borer larvae.

Often, damage is not noticed until it is too late for effective treatment. As a preventative procedure, homeowners should make sure the trees in their yard are from a multiple number of species, so as to reduce the overall damage and loss from any type of pest that may affect individual tree species.

For more information on the borer, contact the local University of Illinois Extension office at 630-955-1123 or go to the website,5,3. The site contains information from numerous agencies and organizations such as U. of I. Extension.

Other good information sites are at the Illinois Department of Agriculture and the U. of I. blog at

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