Currently, spongy moth can be found across much of Wisconsin, with well-established populations in the eastern two-thirds of the state. However, spongy moth is spreading westward over time. To help limit the spread of this invasive insect, the Wisconsin Department of Agriculture, Trade and Consumer Protection participates in a national Slow the Spread Program and 53 Wisconsin counties are part of a quarantine. Visit this page to learn more about the quarantine and what it means for Wisconsinites.
If your property is in one of the quarantined counties, spongy moth (Lymantria dispar) could be abundant enough to cause defoliation in your area. In un-quarantined counties, spongy moth is not common and it would be unusual for this pest to be a problem.