Wisconsin Stinging Insects: Understanding Wasps, Hornets & Yellowjackets

As summer progresses across Wisconsin, calls about stinging insects begin to increase dramatically. Families are spending more time outdoors, backyard barbecues are in full swing, and unfortunately, so are wasps, hornets, and yellowjackets.

Many people use these names interchangeably, but not all stinging insects behave the same way. Different species build different types of nests, have different levels of aggression, and often require different treatment methods.

Knowing what you’re dealing with can help you stay safe—and know when it’s time to call a professional.

Paper Wasps: The Porch Builders

Paper wasps are among the most common stinging insects homeowners encounter.

They get their name from the paper-like material they create by chewing wood fibers and mixing them with saliva. Their nests have an open, umbrella-shaped appearance with visible honeycomb cells.

You’ll commonly find paper wasp nests:

• Under deck railings
• Beneath porch ceilings
• Under roof overhangs
• Around window frames
• On outdoor light fixtures
• Inside sheds and playsets

Paper wasps are generally less aggressive than yellowjackets. They usually won’t sting unless they feel their nest is threatened.

Small, newly started nests are often easier to remove early in the season before colonies grow larger. By late summer, a single nest may contain dozens of wasps actively protecting their home.

Bald-Faced Hornets: Large Nests, Bigger Attitudes

Despite their name, bald-faced hornets are actually a type of yellowjacket.

They’re easy to recognize by their distinctive black bodies with white markings and the large gray football-shaped nests they build.

These aerial nests are commonly attached to:

• Tree branches
• Shrubs
• Utility poles
• House eaves
• Garages
• Barns

A mature bald-faced hornet nest can house several hundred workers by late summer.

Unlike paper wasps, bald-faced hornets aggressively defend their nests. Simply walking too close can trigger a defensive response, with multiple hornets chasing perceived threats for considerable distances.

Because of their aggressive nature and elevated nesting locations, professional removal is strongly recommended.

Yellowjackets: Wisconsin’s Most Aggressive Stinging Insect

If you’ve ever been stung repeatedly while mowing the lawn, chances are you’ve encountered yellowjackets.

Unlike paper wasps or bald-faced hornets, many yellowjackets build their nests underground.

Common nesting locations include:

• Abandoned rodent burrows
• Landscaping beds
• Beneath rocks
• Along sidewalks
• Under decks
• Inside retaining walls

Ground nests can be difficult to spot until someone accidentally disturbs them.

Once threatened, hundreds of yellowjackets may emerge within seconds to defend the colony.

Unlike honey bees, yellowjackets can sting repeatedly because they don’t lose their stinger. Multiple stings often happen before someone has time to escape.

Yellowjackets also become increasingly attracted to sugary foods, soda, fruit, and outdoor meals later in the summer, making them common uninvited guests at picnics and cookouts.

Mud Daubers: The Helpful Wasps

Not every wasp around your home is a pest.

Mud daubers are solitary wasps that build narrow tubes out of mud on garages, barns, sheds, and foundations.

Unlike social wasps, mud daubers don’t defend colonies because there isn’t one.

They’re actually beneficial insects that hunt spiders to feed their young.

In most cases, mud daubers pose very little risk to people and rarely sting.

Why DIY Treatments Can Be Dangerous

Many homeowners reach for a can of wasp spray after spotting a nest.

While this may work on very small paper wasp nests, larger colonies often present significant risks.

Common mistakes include:

• Spraying during the heat of the day when insects are most active
• Standing too close to the nest
• Missing hidden entrances
• Disturbing underground yellowjacket colonies
• Using ladders while being attacked by stinging insects

Every year, emergency rooms treat people for falls, allergic reactions, and multiple stings resulting from attempted nest removal.

Professional pest control technicians have the proper equipment, protective clothing, and treatment products to safely eliminate nests while minimizing the risk of stings.

Prevention Starts Early

The best time to deal with stinging insects is before colonies become established.

Throughout spring and early summer, homeowners should periodically inspect around their property for small, newly forming nests.

Pay particular attention to:

• Porch ceilings
• Decks
• Eaves
• Mailboxes
• Play equipment
• Sheds
• Fence posts

Removing a tiny nest in May is much easier than dealing with a mature colony in August.

Routine exterior pest control services can also help discourage many stinging insects from establishing nests around your home.

Leave the Dangerous Nests to the Professionals

Not every wasp or hornet nest requires emergency treatment, but knowing the difference can save you from painful stings and dangerous situations.

Whether it’s a paper wasp nest under your deck, a bald-faced hornet nest hanging from a tree, or an aggressive yellowjacket colony hidden beneath your lawn, proper identification is the first step toward effective control.

At Erdye’s Pest Control, our experienced technicians safely identify and remove stinging insect nests throughout Wisconsin using professional equipment and proven treatment methods. We can also help identify conditions around your property that may encourage future nesting.

If you’ve noticed increased wasp activity around your home or discovered a nest, don’t take unnecessary risks. Contact Erdye’s Pest Control and let our professionals handle the problem so you can enjoy your yard with confidence all season long.