Venomous House Spiders of Wisconsin: Identification & Bite Info

Common House Spiders Found in Wisconsin Homes

Wisconsin households play host to a variety of different spider species. While most spiders found indoors pose no threat, some can deliver painful bites. Knowing how to identify venomous spiders can help homeowners take proper precautions.

Spider Bite Symptoms

Spider bites often produce certain symptoms whether from dangerous or harmless house spiders, including:

• Red, swollen bump at the bite site
• Mild stinging or burning pain
• Itching around the bite
• Surface level skin lesions

Bites from more toxic spiders like the brown recluse or black widow can cause additional reactions like nausea, headache, fever, and muscle pain. Seek medical care right away if severe symptoms develop after a known or suspected spider bite.

Venomous Spiders of Wisconsin

Of the thousands of spider species living in the state, most do not pose serious health risks to people. But two types of spiders found within Wisconsin homes can inflict dangerous bites:

Brown Recluse Spiders

The brown recluse spider inhabits houses across southern Wisconsin. Usually light tan to dark brown with a distinctive violin shape on its body, this spider bites when threatened or accidentally pressed against the skin.

While their venom only causes mild effects in most cases, some people experience severe skin tissue damage around the bite site. Seek emergency care for bites that swell severely or won't heal.

Black Widow Spiders

Black widow spiders with the iconic red hourglass on their bellies reside in Wisconsin as well. People may encounter them in gardens, sheds, wood piles, or other semi-dark, sheltered areas around homes.

Though rare, bites contain neurotoxic venom that can trigger muscle spasms, abdominal pain, and breathing difficulties. Black widow bites require prompt medical treatment to relieve these dangerous reactions.

Other Common House Spiders of Wisconsin

While the brown recluse and black widow spiders pose the main threats, many other spider species call Wisconsin houses and residential areas home as well.

Grass Spiders

Grass spiders thrive outdoors in gardens, frontyards, and other vegetation but often wander indoors accidentally. Medium brown with prominent black and white markings on their bulbous abdomens, they may bite in self-defense but aren't considered dangerous spiders.

Cellar Spiders

Also called daddy longlegs spiders, cellar spiders set up tangled webs in dim corners of basements and cellars. These spindly spiders help control pest insects. Though urban legends persist about their venomous potential, cellar spiders in fact cannot pierce human skin to deliver a significant bite.

Jumping Spiders

Around 1/4 to 1/2 inch long, jumping spiders come in black, brown, grey, and sometimes brightly colored varieties. As their name suggests, they spring on their prey rather than building webs. Jumping spiders don't pose safety concerns but surprise homeowners with their startling pounces.

Orb Weaver Spiders

Orb weaver spiders construct large, intricate circular webs outdoors that sometimes extend over windows, patios, and entryways. Some showcase unique patterns, like the yellow garden spider's lightning bolt insignia. They bite only in extreme harassment.

Spider Bite Prevention in Wisconsin Homes

While most spiders present more nuisance than danger inside Wisconsin houses, smart prevention measures can minimize run-ins.

Sanitation and Clutter Control

Spiders infest areas with easy access to insects and rodents to prey upon. Keeping a clean home free of clutter denies them harborage and food sources.

Sealing Up Entry Points

Install weatherstripping around windows and doors and caulk other cracks to block spiders from sneaking inside seeking food and shelter.

Insect Control

Reducing other insects through safe treatments also lowers the appeal of homes for spiders. Avoid commercial pesticides around children and pets when possible.

Clear Outdoor Debris

Raking leaves, trimming vegetation, and clearing other yard waste spiders hide within brings outdoor populations down.

While most spiders spotted indoors present no danger, their unpredictable bites can alarm homeowners. Watch for signs of infestations, be able to identify venomous species, and take proactive prevention measures for peace of mind.

Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a healthcare professional before starting any new treatment regimen.