The Sconi

The Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) is set to install approximately 8,000 traps for the spongy moth (Lymantria dispar) in 2025. These traps will be placed across 36 counties in western and central Wisconsin from mid-May through early July. The locations are determined using a grid- and data-based system, with most traps situated along public roadside rights-of-way. Some traps may also be placed on private property where new infestations are suspected. DATCP has requested that all traps remain undisturbed once they are installed.

“Traps are used both to monitor known spongy moth populations and to identify new populations in previously uninfested areas," stated Amanda Miller, DATCP Spongy Moth Trapping Coordinator. “Even though spongy moth populations drastically decreased last season, the total male moth catch still set a record as the second highest in recent program history. Data collected from traps this season will be crucial in the program's effort to pinpoint new populations and limit their spread before infestations become large enough to cause damage to trees."

These small green box traps are attached to trees and emit a scent similar to that of flightless female spongy moths, which attracts adult male moths. The lure scent does not affect other insects, animals, or humans. Although these traps capture adult male spongy moths, their primary purpose is data collection to inform subsequent control efforts rather than directly reducing the population of this invasive species.

Trapping staff will monitor these installations until male moths cease flying around Labor Day, at which point the traps will be removed. Staff members can be identified by their fluorescent vests and identification badges. Each trap features a phone number and QR code for property owners who have questions or need assistance with damaged or unwanted traps.

For more details on spongy moth trapping efforts, individuals can visit the official website or contact DATCP via hotline or email.