Cicada Killer Wasps: The Lawn Destroyer You Might Be Misdiagnosing
Seeing holes and dirt mounds in your lawn? Before you call a mole removal service, look closer. Cicada killer wasps have been doing massive damage to St. Louis lawns in recent years — and their burrows look almost identical to mole damage.
With 20 years of lawn care experience before specializing in pest control, I've seen countless homeowners treat for the wrong problem. Let me diagnose what's really happening in your yard.
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Is It Moles or Cicada Killers?
I've been called to dozens of homes where the owner was convinced they had a mole problem. They'd already tried traps, repellents, even hired mole removal services — with no success. The reason? It wasn't moles at all.
Cicada killer wasp burrows create dirt mounds and holes that look remarkably similar to mole damage. But the treatment is completely different. Mole treatments won't touch cicada killers, and you'll waste time and money on the wrong solution.
After 20 years in lawn care, I can tell the difference immediately. A quick inspection tells me exactly what you're dealing with — and how to fix it.
Key Differences
Cicada Killer Signs:
- • Pencil-sized holes (about 1/2 inch diameter)
- • Dirt mounds next to holes
- • Large wasps hovering low over lawn
- • Active July through September
Mole Signs:
- • Raised tunnels/ridges in lawn
- • Volcano-shaped mounds
- • No visible holes
- • Active year-round
What Are Cicada Killer Wasps?
Cicada killers are the largest wasps in Missouri—up to 2 inches long. They're named for their prey: they hunt cicadas to feed their larvae. While they look terrifying, they're actually not aggressive toward humans. Female cicada killers can sting but rarely do, and males are territorial but can't sting at all.
The real problem is lawn damage. Female cicada killers dig burrows in lawns, pushing up mounds of soil. A single female can dig 4-5 burrows, and they tend to nest in groups. I've seen lawns with dozens of burrows creating serious damage — and homeowners who thought they had moles for years.
These wasps prefer well-drained, sun-exposed areas with thin grass—which describes many St. Louis lawns in July and August when cicada killers are most active.
Identifying Cicada Killers
- Size
Very large, 1.5 to 2 inches long
- Color
Black with yellow markings on abdomen
- Burrows
Pencil-sized holes with dirt mounds
- Activity
Most active July-August in hot weather
- Behavior
Low hovering flights over lawns
The Real Problem: Lawn Damage
Cicada killers won't sting you, but they will destroy your lawn.
Unsightly Mounds
Each burrow creates a pile of excavated soil that kills the grass beneath it. Multiple burrows create a pockmarked, uneven lawn.
Soil Displacement
A single female can move significant amounts of soil. This disrupts grass roots and creates bare spots that take time to recover.
Annual Return
Cicada killers return to the same area year after year. Without treatment, infestations get worse over time.
My Treatment Approach
After 20 years in lawn care, I know exactly how to handle cicada killers.
Locate All Burrows
I carefully survey your lawn to find every active burrow. Cicada killers often nest in clusters, so thorough inspection is essential.
Direct Treatment
Each burrow is treated individually with professional products that eliminate the wasp inside. This is more effective than broadcast spraying.
Prevention Advice
I'll explain how to make your lawn less attractive to cicada killers—things like proper watering, overseeding thin areas, and mulching.
Prevention: Making Your Lawn Less Attractive
Thicken Your Lawn
Overseed thin areas—cicada killers prefer bare or sparse grass
Water Properly
Deep, infrequent watering encourages thick turf
Mulch Beds
Cover bare soil near the lawn with mulch
Address Drainage
Fix areas where soil dries out and compacts
Giant Wasps Digging Up Your Lawn?
Don't let cicada killers damage your lawn. Call me for fast, effective treatment.