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Lisle begins emerald ash borer program

LISLE – The village of Lisle has kicked off a multi-year program of treating ash trees on the public right-of-way with insecticides to prevent and/or reduce the damaging effects of the emerald ash borer.

The emerald ash borer is a beetle from Asia that has now been found in Lisle.

Although only approximately a half-inch long, this metallic green insect can fly up to a mile from where it emerges. Adult beetles create D-shaped exit holes on the trunks and branches of infested ash trees.

Trees with D-shaped holes have been infected for at least one year. Once infected, a tree’s canopy turns yellow and thins; then its branches die. Generally, a tree will only live two to four years once these signs appear.

Lisle ash trees greater than 9 inches in diameter will be treated. Xytect will be used on trees smaller than twenty inches in diameter, while TREE-age will be used on larger trees.

Notices will be placed on treated ash trees. Residents are encouraged to water treat trees at least once a week after treatment through June 30 to improve the treatment’s effectiveness.

Not every tree will respond positively to the treatment. Consequently, the goal of the program is twofold: to save as many ash trees as possible and to prolong the life of ash trees in order to manage removal of the dying trees.

For more information, visit or contact Public Works at 630-271-4180.

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