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Tree-lined residential street with older homes and shade trees in summer

Cicada Killers Waterville, OH: What to Know Before You Panic

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Waterville is a city on the Maumee River in southwestern Lucas County, with a historic downtown and tree-lined streets and backyards. Those shade trees are home to annual cicadas, and where there are annual cicadas there can be cicada killers. If you’ve seen cicada killers Waterville, OH lawns in July, with huge wasps zipping low over the grass and little piles of soil appearing overnight, here’s what you need to know before you panic.

How to Identify Cicada Killers: Waterville, OH Yards

Large black and yellow wasp beside a burrow and soil mound at a lawn edge, typical of cicada killers Waterville OH yards
Cicada killer burrows are finger-width holes with a fan of loose soil.

Why Sting Risk Is Low

OSU’s Buckeye Yard and Garden onLine says the females aren’t aggressive and stinging encounters are extremely rare. The wasps that hover at eye level and dive at you are usually males, and OSU notes the males lack stingers. UKY says cicada killers aren’t considered stinging hazards unless directly disturbed. See male cicada killers and cicada killer vs. yellowjacket.

Why They Pick Your Yard

OSU notes cicada killers feed only on annual cicadas, so trees nearby help. UKY says females dig in dry, sandy, loose soil, and their young overwinter in the same tunnels. That’s why the same bare strip by the sidewalk can fill with holes year after year. See do cicada killers come back? and the cicada killer life cycle.

Relocation Instead of Lawn Poison

OSU does not recommend insecticides for cicada killers. If the burrows are out of the way, leaving them alone is fine. If they’re along a walk, patio or play area, we relocate the wasps away from where people walk and play, with no poison in the soil. After that, UKY suggests mulch, shade or added irrigation to make the spot less inviting.

  • Flag the burrows and steer foot traffic around them.
  • Wear shoes on lawns with active burrows.
  • Keep dogs from digging at holes. See cicada killers and dogs.
  • Don’t pour chemicals or gas into the holes.

Waterville is in Lucas County, and our Main Office in Loudon Township is the closer of our two offices. See our Waterville, OH service page.

Frequently Asked Questions

Are they hornets?

OSU’s ENT-0102 notes cicada killers are often mistaken for hornets, including the northern giant hornet. Ohio’s common big hornet is the European hornet. See European hornets.

They’re in my pavers. Now what?

See cicada killers in pavers and retaining walls.

Cicada Killers in Your Waterville Yard?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Dog sniffing a small hole in a lawn

Cicada Killer Dog Safety: Are Pets at Risk?

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A big, slow-flying wasp low over the lawn is irresistible to a lot of dogs. If you have a cicada killer dog situation, with a pup chasing, pawing or snapping at the wasps, the good news is that cicada killers rarely sting. The bad news is that a dog grabbing one in its mouth is exactly the kind of disturbance that can lead to a sting. Here’s what to know.

The Real Cicada Killer Dog Risk

University of Kentucky Entomology says cicada killers aren’t considered stinging hazards unless they are directly disturbed. OSU Buckeye Yard and Garden onLine notes the females aren’t aggressive and stinging encounters are extremely rare. The ones that hover and chase are usually males, and OSU Extension ENT-0102 notes males are incapable of stinging.

So a dog running around the yard is at low risk. A dog that digs at burrows or catches a female in its mouth is a different story. That’s when a sting on the nose, lip or mouth is possible.

Leashed dog walking a mowed backyard path, a simple cicada killer dog safety routine
Leash walks keep a curious dog away from active burrows.

Signs Your Dog Was Stung

VCA Animal Hospitals says to consider an insect sting if your dog suddenly paws at its face, chews at a foot, or starts to swell anywhere. Dogs stung in the mouth may have trouble eating. VCA also notes that allergic reactions usually occur within 20 minutes but can be delayed for hours, so close monitoring matters.

Get your dog to a veterinarian or emergency clinic right away for severe swelling around the head or neck, trouble breathing, or drooling from swelling in the throat. The Merck Veterinary Manual lists sudden diarrhea, heavy drooling, vomiting, collapse and seizures as signs of a severe allergic reaction. Call your vet before giving any medication.

Simple Yard Routines for Pet Owners

  • Know where the burrows are. Look for finger-width holes with fans of loose soil in sunny, bare spots.
  • Leash or redirect near burrows during July and August, when activity peaks.
  • Don’t let the dog dig at holes. Digging is how a dog ends up face to face with a female.
  • Change the spot. UKY notes mulch, shade or added irrigation can make cicada killers move elsewhere.
  • Skip lawn insecticides. OSU does not recommend them for cicada killers, and they add another exposure for pets.

Make Sure It’s Not Yellowjackets

Yellowjacket ground nests are a much bigger risk to dogs because many wasps defend the nest and can sting repeatedly. See cicada killer vs. yellowjacket, keeping kids and pets safe around nests and multiple wasp stings.

Frequently Asked Questions

My dog ate a cicada killer. Now what?

Watch for swelling, pawing at the mouth, drooling or trouble breathing, and call your veterinarian if you see any of them.

Can male cicada killers hurt my dog?

Males can’t sting. See male cicada killers.

Cicada Killers Where Your Dog Plays?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Hole with spilled sand in the joint between brick pavers

Cicada Killers in Pavers, Patios and Retaining Walls

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Little piles of sand on the patio every morning, a hole between two bricks, and big wasps cruising low over the pavers. Cicada killers in pavers, patios and retaining walls are a common midsummer complaint, and there’s a simple reason for it. The materials under and between hardscape are exactly what these wasps like to dig.

Why Cicada Killers in Pavers Are So Common

University of Kentucky Entomology says female cicada killers dig burrows in dry, sandy, loose soils. Paver joints and the bedding under pavers are often sand. The backfill behind a retaining wall is usually loose and well drained. These spots are sunny, warm and easy to dig. UKY specifically notes that people often see large piles of sand or loose soil building up near retaining walls.

Our cicada killer relocation page describes the same thing: a bare patch by a sidewalk or a sandy edge can draw them back year after year.

Soil pile and hole at the base of a block retaining wall, a sign of cicada killers in pavers and walls
University of Kentucky Entomology notes cicada killer soil piles often build up near retaining walls.

Is It Hurting the Patio?

UKY says the issues from cicada killer digging are mostly aesthetic. The soil piles can smother turf or bother plants, and they’re annoying on a clean patio. Over time, sand pulled out of joints can leave gaps between pavers, so it’s worth refilling joints after the season.

Sting Risk on a Patio

OSU Buckeye Yard and Garden onLine notes the females are not aggressive and stings are extremely rare. The big wasps hovering over the patio are usually males, which can’t sting. See male cicada killers. The real issue is location. A patio is where people walk barefoot, kids play and dogs lie down.

What Helps

  • Relocate the active wasps. We move them away from patios and walkways without pouring poison into the joints or soil.
  • Refill and firm up joints. Once the season ends, refill open, sandy joints so there’s less loose sand to dig.
  • Cover nearby bare soil. UKY notes wood or stone mulch, shade or added irrigation can make them disperse and build elsewhere.
  • Don’t flood the holes with chemicals. OSU does not recommend insecticides for cicada killers.

Is It Really Cicada Killers?

Ants, ground bees and other digger wasps also push sand out of joints. Yellowjackets nest in the ground too, and they’re a very different risk. Watch the hole for a few minutes from a distance. One large wasp coming and going is typical of cicada killers. A steady stream of small wasps is a yellowjacket nest. See cicada killer vs. yellowjacket and ground bees vs. yellowjackets.

Frequently Asked Questions

Will they come back next year?

Often, because their young overwinter in the same soil. See do cicada killers come back?

Can I just sweep the piles away?

Yes. Sweeping won’t stop the digging, but it keeps the patio usable while you plan a fix.

Cicada Killers Digging Up Your Patio?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Large wasp dragging a paralyzed cicada across the ground toward a burrow

Cicada Killer Life Cycle: From Burrow to Adult

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Most people see cicada killers for a few weeks in midsummer and then never think about them again. But the cicada killer life cycle runs all year, mostly underground in the same patch of soil. Knowing what’s happening down there explains why the wasps show up when they do and why they often return to the same yard.

The Cicada Killer Life Cycle Starts in Summer

University of Kentucky Entomology says males begin emerging in late June and July and stake out areas where females will appear. Once females emerge and mate, they dig tunnels in dry, sandy, loose soil. The digging leaves piles of soil near retaining walls, in turf and in landscape beds.

Timing follows the prey. OSU Buckeye Yard and Garden onLine notes cicada killers feed exclusively on annual cicadas and normally appear when the annual cicadas arrive. In Ohio, the most common annual cicada, the dog-day cicada, usually shows up starting in July.

Green and black annual cicada on tree bark, the prey at the center of the cicada killer life cycle
Cicada killers hunt only annual cicadas, the kind that sing in Ohio trees every summer.

Hunting and Stocking the Burrow

A female finds a cicada, stings it to paralyze it, and brings it back to her burrow. UKY explains that she builds multiple cells in each burrow, much like a mason bee. Once a cicada is placed in a cell, she lays an egg on it.

Egg and Larva

The egg hatches, and the larva feeds on the cicada its mother provided. UKY says larvae develop over about two weeks.

Winter Underground

After feeding, the larva pupates for the winter. UKY notes cicada killers overwinter as pupae in the tunnels their mothers built. That’s the longest stage of the cycle, from late summer through the following spring, all of it out of sight.

Emergence the Next Summer

The next summer, new adults dig their way out, males first. Females mate and start new burrows, often in the same sunny, loose soil. That’s why the same strip by the sidewalk can fill with holes year after year. See do cicada killers come back?

What the Cycle Means for Your Yard

  • Act in summer, change the soil any time. Relocation happens while adults are active. Mulch, shade or irrigation can be added later to make the spot less inviting, as UKY suggests.
  • Skip the poison. OSU does not recommend insecticides for cicada killers, and we don’t put poison in the soil.
  • Know the sexes. The bold ones hovering at you early in the season are males, which can’t sting. See male cicada killers.

Frequently Asked Questions

How many generations a year?

The cycle described by UKY is one generation a year: adults in summer, young underground through winter.

Do cicada killers eat periodical cicadas?

OSU notes they prey on annual cicadas, not periodical cicadas or other insects.

Are they related to other ground wasps?

Other solitary diggers look similar. See great black wasps and golden digger wasps and mud daubers and cicada killers.

Burrows Where You Don’t Want Them?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Large wasp hovering low over a mowed lawn

Male Cicada Killer vs Female: Why the Ones Buzzing You Can’t Sting

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You step into the yard and a huge wasp zips up to eye level, hovers, and darts at you. Then another. It feels like an attack, but it’s almost always a male cicada killer, and males have no stinger. Here’s what’s going on and how to tell the sexes apart.

What a Male Cicada Killer Is Doing

University of Kentucky Entomology explains that males emerge before females and stake out areas where they expect females to appear. The big wasps hovering in the air are usually the first thing people notice. UKY says males will “inspect” people, hovering at eye level to size you up. OSU Extension ENT-0102 adds that males hover protectively near nests and even dive-bomb passersby, but they are incapable of stinging.

It’s territorial behavior, not hunting. A male has nothing to gain from stinging you, and he has no stinger to do it with. He’s checking whether you’re a rival or a mate.

Timing tells you a lot, too. UKY notes males begin emerging in late June and July and wait for females to arrive. So the early, bold fliers at the start of the season are especially likely to be males.

Large solitary wasp resting on a leaf, similar in size to a male cicada killer
Females are larger than males and do the digging and hunting.

Male vs Female Cicada Killer

  • Size. UKY says females range from about 1.5 to nearly 2 inches long, while males are up to about 1.5 inches.
  • Stinger. Females have a stinger, which they use to paralyze cicadas. UKY notes males have a non-stinging pseudostinger instead.
  • Behavior. Males hover, patrol and chase. Females spend their time digging burrows and flying cicadas back to them.
  • Look. Both have dark abdomens with light yellow markings and orange-tinged legs and wings, so behavior is the easier clue.

What About the Females?

OSU Buckeye Yard and Garden onLine says the females are not aggressive and stinging encounters are extremely rare. UKY notes cicada killers aren’t considered stinging hazards unless directly disturbed, such as being stepped on barefoot or grabbed. That’s why kids, pets and bare feet are the main reasons to move them. See cicada killers and dogs.

How to Handle the Dive-Bombing

  • Don’t swat. Swinging at a male won’t help, and grabbing at big wasps is how the rare sting from a female happens.
  • Walk through calmly. A male will usually break off once you’re past his patch.
  • Wear shoes on lawns and paths where burrows are active.
  • Change the spot. UKY notes mulch, shade or extra irrigation can make them nest elsewhere. See do cicada killers come back?

Frequently Asked Questions

Are males more common?

They’re more noticeable early in the season, because UKY notes they emerge first and patrol before the females arrive.

Is a male cicada killer a hornet?

No, though OSU notes they’re often mistaken for European hornets. See European hornets.

Do I need to do anything?

Often no. UKY says management is generally unnecessary. If burrows are by a door, patio or play area, relocation helps.

Big Wasps Patrolling Your Yard?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Several small burrows in a bare, sandy patch beside a sidewalk

Do Cicada Killers Come Back Every Year?

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Every July, the same bare strip by the sidewalk fills up with holes again. So do cicada killers come back every year? Often, yes. Not because the same wasps return, but because the next generation is already in the ground, and the soil that drew their mothers is still there.

Why Do Cicada Killers Come Back to the Same Spot?

University of Kentucky Entomology explains that cicada killers overwinter as pupae in the tunnels their mothers dug. Each female builds multiple cells in a burrow and stocks them with cicadas. The larvae develop over about two weeks, then pupate for the winter. The next summer, new adults dig out of that same patch of soil.

UKY notes that males emerge first, in late June and July, and wait for females. After mating, the females start digging nearby. That’s why a yard with cicada killers one summer often has them the next.

Wood mulch bed along a sidewalk and foundation, one answer to do cicada killers come back
Covering bare soil with mulch is one change that can make a spot less appealing.

The Soil That Draws Them

UKY says females dig in dry, sandy, loose soil. Our cicada killer relocation page describes the same pattern we see in the field: a bare patch by a sidewalk or a sandy garden edge can draw them back year after year. Sunny, well-drained ground is ideal for them. Thick, shaded or damp turf usually isn’t.

How to Break the Cycle

  • Relocate the active wasps. We move cicada killers away from walkways, patios and play areas without pouring poison into the soil.
  • Cover bare soil. UKY notes that adding wood or stone mulch can cause them to disperse and try to build elsewhere.
  • Add shade or water. UKY also lists creating shade and increasing irrigation in a specific area.
  • Thicken the lawn. Filling thin, bare spots takes away the open soil they like.

OSU Buckeye Yard and Garden onLine adds that insecticides aimed at cicada killers are not recommended. They’re considered beneficial, and the females are not aggressive.

What If You Do Nothing?

That’s a fair choice when the burrows are out of the way. UKY says the problems from their digging are mostly cosmetic, like soil piles that can smother turf or bother plants. Adult activity peaks in July and August and then fades. The trouble is usually location: a sidewalk edge, a patio, a play area or a spot the dog patrols.

Do They Always Come Back?

Not always. OSU notes cicada killer numbers have been down over much of Ohio in recent years, with populations highly localized. And because they feed only on annual cicadas, their numbers depend partly on how many cicadas are around.

Frequently Asked Questions

Is it the same wasp every year?

No. Adults live one summer. The ones you see next year are their offspring, which spent the winter underground.

When will they show up?

Males appear in late June and July, and activity peaks in July and August. See the cicada killer life cycle.

Could the holes be something else?

Yes. See holes in the lawn and great black wasps and golden digger wasps.

Same Spot, Same Wasps Every Summer?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Large wasp at the entrance of a burrow in sandy soil

Cicada Killer vs Yellowjacket: Why Size Doesn’t Equal Danger

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When a wasp nearly 2 inches long buzzes across the lawn, it’s natural to assume it’s the most dangerous thing in the yard. But in the matchup of cicada killer vs yellowjacket, the big one is usually the gentle one. Size and danger don’t line up. Here’s how to tell them apart and which one actually needs a call.

Cicada Killer vs Yellowjacket at a Glance

  • Size. University of Kentucky Entomology says female cicada killers can be nearly 2 inches long and males about 1.5 inches. OSU Extension HYG-2075 describes a typical yellowjacket worker as about 1/2 inch long.
  • Colony. Cicada killers are solitary. Each female digs and stocks her own burrow. Yellowjackets live in annual colonies that, OSU says, reach about 4,000 to 5,000 workers by August and late September.
  • Food. OSU Buckeye Yard and Garden onLine notes cicada killers feed exclusively on annual cicadas. Yellowjackets hunt insects and, in late summer, switch to sweets, which is why they crash picnics.
  • Sting risk. OSU calls stinging encounters with cicada killers extremely rare and says the females aren’t aggressive. Yellowjackets, OSU notes, can sting repeatedly and often do near the nest.
Several yellowjackets at a single hole in a lawn, the key difference in cicada killer vs yellowjacket nests
Steady traffic of many small wasps through one hole is the classic yellowjacket ground nest.

Reading the Holes

Both can nest in the ground, so the hole itself is the best clue. Cicada killer burrows are about finger-width, often with a fan of loose soil, in sunny, bare or sandy spots. You’ll often see several in one area, each used by a single female. A yellowjacket nest usually has one entrance with a steady stream of small wasps going in and out, and OSU notes these nests are often in grassy areas and mulched beds. See holes in the lawn and ground bees vs. yellowjackets.

Why the Big One Is Calmer

A cicada killer has no colony to defend. UKY says they aren’t considered stinging hazards unless directly disturbed, and the big wasps hovering at eye level are usually males, which can’t sting at all. See male cicada killers. A yellowjacket colony has thousands of workers guarding brood. Run a mower over the entrance and they come out fighting. See yellowjacket ground nest removal.

What We Do About Each

Cicada killers are relocated away from walkways, patios and play areas, with no poison in the soil. Yellowjacket nests are removed by hand or vacuum, without pesticides. Either way, start with a photo from a safe distance.

Frequently Asked Questions

Could it be a hornet?

OSU Extension ENT-0102 notes cicada killers are often mistaken for European hornets and even northern giant hornets. See giant hornets in Ohio.

Are cicada killers beneficial?

OSU considers them beneficial insects and does not recommend insecticides for them.

Which is worse for a kid with an allergy?

A yellowjacket nest, by far. See sting allergies.

Not Sure Which One You Have?

We relocate cicada killers instead of putting poison into the soil where people and pets walk. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page, and send a photo of the wasps or burrows if you can. See cicada killer relocation for how it works.

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Close-up of small holes in bare lawn soil

Myth: Every Hole in the Lawn Is a Yellowjacket Nest. How to ID Holes in the Lawn

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You find a hole in the grass and assume the worst. But holes in the lawn come from many animals, and most of them aren’t yellowjackets. Before anyone grabs a can of spray or a garden hose, spend a few minutes watching from a safe distance. What goes in and out tells you nearly everything.

Holes in the Lawn: A Quick ID Guide

Yellowjackets: one busy hole, steady traffic

Yellowjacket ground nests usually have a single entrance with a steady stream of wasps flying in and out. Ohio State University Extension warns that nests may be at ground level in grassy areas and mulched beds (OSU HYG-2075). This is the one to take seriously. See yellowjacket ground nests.

Cicada killers: big wasps, sandy soil, midsummer

The University of Kentucky describes cicada killers as large wasps, with females nearly 2 inches long, that dig burrows in dry, sandy, loose soil. Tunnels can be 12 to 15 inches deep. They are not considered stinging hazards unless directly disturbed, and males have no stinger at all (UK ENTFACT-004). See cicada killer relocation.

Ground bees: many small mounds in thin turf

OSU describes ground or digger bees as solitary bees about half an inch long that often nest in groups. Females throw up a soil pile about an inch high and three to four inches across, with the opening in the middle, usually where there’s little plant cover (OSU HYG-2143). See ground bees vs. yellowjackets and sweat bees and mining bees.

Mud chimney built by a burrowing crayfish rising above turfgrass, one of the less obvious holes in the lawn
A mud chimney like this is the work of a burrowing crayfish, not a wasp.

Crayfish: mud chimneys in wet spots

Burrowing crayfish build mud chimneys that can rise 3 to 8 inches above the soil, mostly in poorly drained ground near streams or ditches, according to OSU’s Buckeye Yard and Garden onLine. Don’t pour toxins down the holes. Knock the chimneys down before mowing (OSU BYGL).

Chipmunks: a clean 2-inch hole, no dirt pile

Penn State Extension says chipmunk burrow entrances are about 2 inches across with no mound of dirt, usually hidden near objects or buildings (Penn State Extension).

Other diggers

OSU also notes that many solitary digger wasps prefer open, sandy or light soil and nest where turf is thin with soil showing through. Thin, patchy turf in a sunny spot tends to collect several kinds of ground nesters at once. Thickening the turf is a long-term fix worth talking to a lawn professional about.

What to Do Next

  • Watch, don’t poke. No sticks, hoses or sprays into the hole.
  • Mark it. A flag keeps the mower and the kids away. See keeping kids and pets safe.
  • Take a photo or short video of what flies in and out.

Frequently Asked Questions

Should I flood the hole?

No. Flooding or spraying a yellowjacket nest can send angry wasps straight at you. See DIY wasp spray mistakes.

Are ground bees dangerous?

OSU notes most solitary ground nesters only sting if you capture or restrain them. Social bumblebees will defend their nests.

Could it be bumblebees?

Yes. Bumblebees often nest in old rodent burrows. See bumblebee nest in the ground.

What about big blue wasps over the grass?

See blue-winged wasps over the lawn.

Still Not Sure?

Send us a photo. Call or text Northwest Ohio Wasp Removal at 419-614-6445, or use our contact page. We handle wasp and hornet nest removal and cicada killer relocation, and bumblebees are always relocated.

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Wasp near nest hole in soil in Northwest Ohio. Ohio Wasp Removal

Mud Daubers and Cicada Killers: Ohio’s Gentle Solitary Wasps

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Not every wasp around your home is a threat. Some of the most alarming-looking insects in Ohio are actually solitary wasps that rarely sting people and help keep spiders and cicadas in check. Before you search for wasp removal, it is worth getting to know two of the most common: mud daubers and cicada killers. Here is how to recognize them, why they behave the way they do, and when, if ever, they need attention in Northwest Ohio, East Indiana, and Southern Michigan.

Social vs. Solitary Wasps

The wasps that cause most problems, like yellowjackets, bald-faced hornets, and European hornets, are social. They live in colonies with a queen and many workers that defend the nest together. That group defense is what makes them dangerous.

Solitary wasps are different. Each female builds and stocks her own nest. There is no colony and no army of workers to defend it. As a result, solitary wasps are generally far less likely to sting, and when they do, it is usually because they were handled or trapped against skin.

Not sure which kind you have? Start with our wasp, bee, and hornet identification guide.

Mud Daubers: Ohio’s Spider Hunters

Black-and-yellow mud dauber building a mud nest under a wooden beam
Mud daubers build nests from mud and stock them with spiders. (Illustrative image)

What they look like

Mud daubers are slender wasps with an extremely long, thin, threadlike “waist.” The most common types in our area include:

  • Black-and-yellow mud dauber (Sceliphron caementarium): black with yellow markings and yellow legs.
  • Organ-pipe mud dauber (Trypoxylon politum): shiny black, builds long parallel mud tubes that resemble organ pipes.
  • Blue mud dauber (Chalybion californicum): metallic blue-black, often reuses old nests built by other mud daubers.

Their nests

Instead of paper, mud daubers build with mud. Look for lumpy clusters of mud cells or tube-shaped nests on protected surfaces: under eaves, in garages, sheds, barns, porch ceilings, attics, and even on the underside of outdoor furniture.

What they do

Each female collects mud from puddles and stream banks, builds cells, and stocks them with paralyzed spiders for her larvae to eat. Blue mud daubers are known for hunting black widow spiders. In other words, mud daubers are free spider control.

Do mud daubers sting?

Rarely. They are not defensive and will usually fly away if approached. Stings typically only happen if one is grabbed or pressed against skin.

Cicada Killers: Big, Loud, and Mostly Harmless

What they look like

The eastern cicada killer (Sphecius speciosus) is one of the largest wasps in Ohio, around 1.5 inches long or more. It has a reddish-brown head and thorax, amber wings, and a black abdomen with pale yellow markings. Because of their size, cicada killers are often mistaken for “murder hornets.” Our article on giant hornets in Ohio covers that confusion.

When and where you will see them

Cicada killers appear in mid to late summer, typically July and August, which lines up with the annual cicadas they hunt. Females dig burrows in well-drained, sandy, or bare soil: along sidewalks and driveways, in thin lawns, sandboxes, flower beds, and the edges of patios. You will often see a small fan of loose soil spilling out of each hole.

What they do

According to Ohio State University Extension, each female digs a tunnel, stings and paralyzes an annual cicada, drags it into an underground chamber, and lays an egg beside it. The larva feeds on the cicada, then overwinters in the burrow and emerges the next summer.

Do cicada killers sting?

Females can sting but are very unlikely to sting people unless handled or stepped on barefoot. Males cannot sting at all. The males are the ones you notice: they patrol the nesting area, hover in your face, and dive-bomb passersby. It is all bluster.

Do Mud Daubers or Cicada Killers Need Wasp Removal?

Usually, no. Both are beneficial and low-risk. That said, there are a few situations where action makes sense:

  • Mud dauber nests in a bad spot: Old, empty mud nests can be scraped off with a putty knife. Check that they are inactive first.
  • Cicada killer burrows in a high-traffic area: Heavy nesting in a sandbox, play area, or along a path can be a nuisance. Watering, thickening the lawn, and mulching bare soil make the area less attractive next year.
  • You are not sure what you have: If insects are pouring out of a single hole in large numbers, that is more likely a yellowjacket ground nest, which is a different and more dangerous situation. See our guide to yellowjacket ground nests.

How to Tell Cicada Killer Burrows From Yellowjacket Nests

  • Cicada killers: Many individual holes, each with a fan of loose soil, wasps coming and going one at a time, large wasps, and July to August timing.
  • Yellowjackets: Usually one entrance, a steady stream of many small wasps flying in and out, and aggressive defense when disturbed, peaking in August and September.

Why We Do Not Recommend Spraying

Our company is owned by a beekeeper, and our methods are pesticide-free. Spraying lawns and eaves to kill solitary wasps also harms the pollinators and beneficial insects that share your yard. In most cases, a little patience and some habitat changes solve the problem.

Frequently Asked Questions

Are mud daubers dangerous to kids or pets?

Mud daubers are among the least aggressive wasps in Ohio. Stings are rare and usually only happen when one is grabbed.

Why is a giant wasp dive-bombing me in my yard?

That is most likely a male cicada killer guarding its territory. Males cannot sting.

Will cicada killers come back every year?

Often, yes. Larvae overwinter in the burrows and emerge the next summer. Changing bare, sandy soil into thick turf or mulch can reduce nesting.

Do you serve areas outside Ohio?

Yes. We serve Northwest Ohio, East Indiana, and Southern Michigan.

Not Sure If It Is Harmless?

If you are not sure whether you are dealing with a solitary wasp or a dangerous colony, we are happy to help identify it. Visit our contact page to reach Northwest Ohio Wasp Removal.

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