The Illinois Toll Highway Authority (ITHA) requested a survey during 2010 for noxious and selected invasive plant species established in ITHA rights-of-way throughout the tollway system in northern and northeastern Illinois. The species of concern provided by the ITHA include all species on the Illinois Noxious Weeds list (Illinois Noxious Weed Law,Administrative Code 2002) and selected invasive species recognized by the Illinois Invasive Plant Species Council (IIPSC). These total 15 species and include annuals, biennials, and perennial forbs and grasses (Table 1). The survey goals were to locate and estimate population sizes of these species within tollway rights-of-way with a focus on moderate to major concentrations to assist in targeted control efforts.
|Name||INHS Technical Report 2011 (11)|