Mole cricket mounds look like small piles of soil pushed up from below, often with a visible hole in the center. They’re distinct from ant mounds or earthworm castings, and they typically appear alongside raised ridges of soil that trace the insect’s shallow tunnels just beneath the surface. If you’re seeing these in your lawn, you’re likely dealing with an active mole cricket infestation, and the mounds are only part of the picture.
What Mole Cricket Mounds Look Like
The classic mole cricket mound is a small dome of loose soil with an opening in the middle, as if something pushed upward from underground. They’re modest in size, nothing like the large, fan-shaped mounds that actual moles create. Alongside these mounds, you’ll usually notice raised ridges or trails of disturbed soil running across the turf surface. These ridges are tunnel tracks. Mole crickets live in burrows roughly half an inch in diameter, and they can tunnel several meters in a single day. The combination of small mounds and visible tunnel ridges is the signature calling card of mole crickets.
Sandy soils make the damage more obvious because the loose soil shifts easily as the crickets push through it. Golf course putting greens are particularly vulnerable, where even slight surface disruption affects playability and mowing quality.
Why Males Build Specialized Mounds
Not all mole cricket mounds are simple tunnel exits. During mating season, males construct a remarkably engineered burrow designed to amplify their calling song. The male digs a tunnel that opens at the soil surface, then curves downward and narrows before expanding into a nearly spherical chamber about 3 to 4 centimeters across. The surface opening is roughly 25 by 85 millimeters, often partially hidden by overhanging grass.
The whole structure functions like an exponential horn, similar in principle to a trumpet bell. The cricket sits inside the bulb-shaped chamber with its sound-producing wings filling the narrow throat of the horn, and the flared opening at the surface broadcasts the call with far greater efficiency than the insect could achieve on its own. These calling burrows are a feat of instinctive acoustic engineering, and the small mound of displaced soil around the opening is what you’ll notice at the surface.
Damage Beyond the Mounds
The mounds themselves are a cosmetic nuisance, but the real problem is what’s happening underneath. Mole cricket tunneling loosens soil around grass root systems, causing roots to dry out and die. The tawny mole cricket, the most destructive species in home lawns, also feeds directly on grass roots and shoots, compounding the damage. Southern mole crickets are primarily predatory (feeding on other soil organisms about 80% of the time), but their tunneling causes the same root disruption.
Bermudagrass and bahiagrass suffer the most, though zoysiagrass, centipedegrass, and creeping bentgrass can also take significant hits. The worst visible damage shows up in late summer and early fall, when young mole crickets are approaching maturity and foraging aggressively. You’ll see thinning turf, brown patches, and areas where the grass pulls up easily because the roots have been severed or desiccated. By that point, the population has been building for months.
When Mounds Appear Through the Year
Mole cricket activity follows a seasonal rhythm. Small mounds and tunnel signs can appear during warm spells in winter, but they’re easy to miss. As temperatures rise in spring, tunneling and mound building pick up. Males begin constructing their calling chambers to attract mates, and the small mounds with visible openings become more common in lawns during this period.
Females lay eggs in late spring, and the eggs hatch between May and June depending on your location. The young nymphs are small and cause little obvious damage at first, but they grow rapidly through the summer. By late August through October, they’re nearly adult-sized, and their tunneling and feeding produce the most severe lawn damage of the year. This is when most homeowners first notice the problem, though the infestation started months earlier.
Confirming Mole Crickets With a Soap Flush
If you see mounds and tunnel ridges but want confirmation before taking action, a soapy water flush is the standard diagnostic test. Mix 1 to 2 tablespoons of lemon-scented liquid dish soap into 1 to 2 gallons of water, stir until suds appear, and slowly pour it over about one square yard of turf. The key is to target healthy grass around the edges of damaged areas, not the dead patches themselves. Insects are less likely to be found where the turf is already destroyed because they’ve moved on to feed elsewhere.
Watch the area for 5 to 10 minutes. Mole crickets irritated by the soap solution will crawl to the surface, confirming what’s living below your lawn. Repeat the test in several spots to get a sense of how widespread the population is.
Managing the Infestation
Timing is everything with mole cricket control. The most effective treatment window is shortly after egg hatch in May or June, when the nymphs are small and vulnerable near the soil surface. Treating adults in fall is far less effective because they’re larger, deeper in the soil, and the damage is already done.
For a biological approach, a specific species of parasitic nematode (a microscopic worm) has been used commercially in Florida since 1993 to target mole crickets in golf courses and pastures. These nematodes move downward through soil, infect and kill mole crickets, and can persist in the soil from year to year. In field trials, initial infection rates reached 40% of the mole cricket population within 24 hours, and populations of young mole crickets dropped by about 85% after one year and 95% or more in subsequent years. The tradeoff is cost: nematodes are applied at billions of individuals per acre and tend to be more expensive than chemical treatments.
Another natural enemy is a parasitic wasp originally from South America that hunts exclusively mole crickets. The female wasp enters a mole cricket’s horizontal burrow, chases it to the surface, stings it to temporarily paralyze it, and lays a single egg on its underside. Planting shallow-flowered nectar plants like shrubby false buttonweed, partridge pea, or goldenrod near affected areas helps sustain local wasp populations. This approach, called conservation biocontrol, won’t eliminate mole crickets overnight but builds long-term pressure on their numbers.
Mole Cricket Mounds vs. Other Lawn Pests
Mole cricket mounds are sometimes confused with the work of actual moles, fire ants, or earthworms. Mole runs create much larger, more dramatic ridges and volcano-shaped mounds. Fire ant mounds are firm, dome-shaped piles without a central hole. Earthworm castings are small, granular clumps scattered across the surface without any tunnel ridges nearby.
Mole cricket mounds are smaller and looser than all of these, with that characteristic pushed-up-from-below appearance and a hole in the center. The accompanying network of shallow tunnel ridges, visible as raised lines snaking across the turf, is the most reliable distinguishing feature. If you can trace a ridge with your finger and feel the soil give way slightly underneath, mole crickets are almost certainly the cause.