Tree of Heaven (Ailanthus altissima) is targeted for removal by Forest Preserves of Cook County under invasive-species management because it hosts the Spotted Lanternfly. Illinois Exotic Weed Act 525 ILCS 10 also lists Ailanthus, requiring landowner control on certain properties.
Forest Preserves of Cook County treats Ailanthus altissima as a priority removal target across 70,000 acres of preserves. Removal crews use cut-stump herbicide applications fall through early winter. The species is the preferred host of Spotted Lanternfly, an invasive pest detected in adjacent states and confirmed in Cook County in 2023. Illinois Exotic Weed Act 525 ILCS 10 lists Ailanthus among regulated species; private landowners along railroads and highways may receive removal notices from the Illinois Department of Agriculture. Cook County Department of Environment and Sustainability coordinates with municipalities on suburban removal grants.
Refusing to remove regulated Tree of Heaven after Department of Agriculture notice triggers fines under 525 ILCS 10/3 up to $1,000 plus removal cost recovery. Forest Preserve enforcement applies only on preserve land, not private parcels.
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