The Illinois Department of Agriculture has announced that the Spongy Moth treatment in northern Illinois is set to commence on Thursday, June 26, 2025. The operation will be conducted by the US Forest Service (USFS), starting with an aerial spray over Country Club Hills in Cook County. The following day, treatments will continue in Oregon and rural Ogle County, Freeport and rural Stephenson County, as well as two areas in rural JoDaviess County.
The Spongy Moth is a non-native pest known for its ability to defoliate plants, making them vulnerable to diseases and environmental challenges. Unlike the emerald ash borer, which targets only ash trees, the Spongy Moth feeds on over 250 plant species but shows a preference for oak and willow trees.
Weather permitting, the identified locations will receive an application of Splat – GM Organic pheromone. This substance acts as a sexual attractant that confuses male moths and prevents mating. The aerial application involves yellow fixed-wing airplanes using an organic and biodegradable product made from food-grade materials. It poses no threat to other insects, mammals, or the environment.
Residents seeking more information can contact the DeKalb Office at 815.787.5476. Specialists will be present during the spraying program. Additional resources such as maps of treatment sites and product details are available on the program’s website at https://www.slowthespread.org/pages/illinois-outreach.
