Wisconsin Launches Slugnet to Track Field Crop Pests

By Blake Jackson

The University of Wisconsin–Madison Extension has launched SlugNet, a new statewide slug monitoring project aimed at understanding slug populations in conservation cropping systems.

This citizen science initiative relies on farmers and volunteers to report slug activity across Wisconsin’s crop fields.

SlugNet is tracking patterns in slug emergence and feeding damage to help farmers manage pests in reduced tillage and cover crop systems. With chemical controls limited and often ineffective, understanding slug behaviour is critical—especially during wet and cool spring conditions that can lead to outbreaks.

Weekly updates are being shared to keep farmers informed. During the week of April 20–26, slug data were first reported from Dane and Fond du Lac counties, where both adult and juvenile slugs were found. Slime trails—but no slugs—were observed in Grant County, suggesting early signs of slug activity.

In the week of April 27–May 3, captures were reported in Fond du Lac, Winnebago, Oconto, and Shawano Counties. Dane County reported slug eggs, indicating a mix of active slugs and early development.

For the week of May 4–10, Dane, Winnebago, and Grant Counties reported fewer than one slug per trap. This week also marked the first data received from Marathon, Ozaukee, and Kewaunee Counties. Slime trails were spotted again in Shawano County. Sauk, Chippewa, and Calumet Counties will join the reporting effort soon.

Current forecasts suggest warmer, drier weather for May, which may help reduce slug activity and protect emerging crops. The SlugNet team is encouraging more volunteers to join and continue monitoring traps.

“This effort helps us understand what leads to damaging slug outbreaks and how to prevent them before crops are affected,” a UW–Madison Extension researcher said.

Farmers can still participate in the 2025 SlugNet project by visiting the SlugNet website, which includes resources on protocols, trap setup, and weekly updates. Data from this year will help shape future pest management strategies for Wisconsin growers.

This initiative strengthens local knowledge and connects the farming community through shared efforts in protecting crops and improving soil health.

Photo Credit: gettyimages-eugenesergeev