Stink Bugs Have Invaded Wisconsin Homes
Invasive brown marmorated stink bugs are seeking winter shelter in Wisconsin structures this autumn.
Updated on Sept. 29, 2026 in Home Cleaning
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The brown marmorated stink bug, a shield-shaped invasive species, has begun appearing in homes across Wisconsin. These insects are moving from outdoor plants into buildings to find shelter as temperatures shift.
Why it matters
As autumn temperatures drop, these insects actively seek warmth in man-made structures to survive the winter. While they may be a nuisance, they do not pose a threat to human health.
Known as Halyomorpha halys, these invasive insects are identified by their shield-shaped bodies and distinct brown, gray, and copper coloring. They are biologically distinct for their ability to emit a putrid odor when they are frightened or killed.
The players
Halyomorpha halys
This is an invasive insect species commonly referred to as the brown marmorated stink bug.
The details
The insects are characterized by their shield-shaped bodies and shades of brown, gray, and copper. They are not considered a threat to humans, though they are known to release a putrid smell if they are scared or killed.
Timeline
During autumn, stink bugs seek shelter in homes.
Culture Shift
This occurrence aligns with the brown marmorated stink bug home-invasion phenomenon, where non-native species adapt to local structures as temperatures shift. These seasonal movements highlight the ongoing integration of invasive insects into residential environments.
Homeowners may encounter these insects around windows or doors as they attempt to move indoors for the season. Residents should be prepared for the distinct odor these bugs release if handled or accidentally crushed during cleanup.
The takeaway
Since stink bugs are primarily a nuisance, sealing potential entry points around doors and windows can help prevent them from moving indoors. Avoid squashing them to prevent the release of their characteristic odor, opting for gentle removal instead.
Further reading
Learn more about managing household pests in our Home Cleaning guide.
Source note: This article includes information reported by WFRV-TV Channel 5.
Live Poll
Are you taking extra precautions to keep pests out of your home this autumn?
