Georgia’s warm climate and sandy soils make the state prime territory for mole crickets, a group of burrowing insects that can shred lawns, pastures, and golf course turf from below ground. The most destructive species in Georgia are invasive South American imports that arrived in the southeastern United States roughly a century ago and have thrived ever since. Understanding their biology, recognizing the signs of an infestation, and knowing when and how to act are the keys to limiting the damage they cause.
Which Species Show Up in Georgia
Three species of mole cricket matter in Georgia. The tawny mole cricket (Neoscapteriscus vicinus, formerly Scapteriscus vicinus) and the southern mole cricket (Neoscapteriscus borellii, formerly Scapteriscus borellii) are both invasive species originally from South America. They are the primary pests. A third species, the northern mole cricket (Neocurtilla hexadactyla), is native to the region but rarely causes significant turf damage because its populations tend to be smaller and it feeds mostly on other soil organisms rather than plant roots.
The tawny mole cricket is the bigger headache for lawns and turf. It feeds heavily on grass roots, and its tunneling rips through the root zone just beneath the soil surface. The southern mole cricket is more of an omnivore, eating other insects and invertebrates along with some plant material. Both species tunnel aggressively, and both thrive in the sandy and loamy soils that cover much of Georgia’s Coastal Plain and Piedmont. Research has shown that the sandy soils common in the southeastern United States actively promote the development and spread of these pest species.
Why Georgia Is Especially Vulnerable
Soil type is a big part of the story. Mole crickets build longer and larger tunnel systems in sandier, looser soils. In loamy soils, their tunnels average around 64 centimeters long with a volume of roughly 209 cubic centimeters, about double the length and volume they manage in heavier clay soils.1Applied Soil Ecology. Biopores from mole crickets (Scapteriscus spp.) increase soil hydraulic conductivity and infiltration rates Georgia’s Coastal Plain, which stretches across much of the southern half of the state, is dominated by sandy and sandy-loam soils. That makes it an ideal landscape for mole crickets to dig, feed, and reproduce with minimal resistance.
Climate matters too. Mole crickets need warm soil temperatures to be active and to complete their life cycle. Georgia’s long growing season and mild winters mean that mole crickets stay active for more months of the year than they would farther north. The combination of warmth and loose soil is essentially an open invitation.
What Mole Cricket Damage Looks Like
The first thing most Georgia homeowners notice is irregular patches of dying grass, often in late spring or early fall. The damage does not look like a clean circle the way fungal disease might. Instead, you get ragged, thinning areas where the turf feels spongy underfoot. If you tug on the grass in a damaged area, it pulls up easily because the roots have been sheared by tunneling or chewed by the crickets themselves.
Another telltale sign is surface tunneling. After a rain or heavy irrigation, mole crickets push soil up as they tunnel just below the surface, leaving small ridges of raised earth that look like tiny mole runs. These ridges are most visible in the morning on short-cut turf like bermudagrass fairways. On a golf course or athletic field, the tunnels can also disrupt the smoothness of the playing surface, which is one reason turf managers in Georgia take mole crickets seriously.
Birds are another clue. If you see armadillos, raccoons, or flocks of birds tearing at your lawn, they may be digging for mole crickets. The secondary damage from predators hunting mole crickets can sometimes be worse than what the crickets themselves cause.
The Mole Cricket Life Cycle in Georgia’s Climate
Timing is everything for mole cricket management, so it helps to understand when they do what. In Georgia, mole crickets have one generation per year. Adults overwinter deep in the soil and become active in spring as soil temperatures warm. From late March through May, adults come to the surface at night to fly, mate, and call. Males dig specialized burrows that act as acoustic amplifiers for their calling songs. The shape of these burrows plays a critical role in projecting sound, and larger males excavate larger chambers that produce louder calls.2North-Western Journal of Zoology. Acoustic burrow structures of European mole crickets, Gryllotalpa gryllotalpa (Orth.: Gryllotalpidae) in Northwestern Iran If you hear a continuous, low-pitched trilling sound coming from your yard on warm spring evenings, that is almost certainly a male mole cricket calling from underground.
After mating, females lay eggs in chambers a few inches below the soil surface. Eggs hatch in late May through June, and the tiny nymphs begin feeding and tunneling immediately. Mid- to late summer is when nymph populations peak and when the damage they cause starts becoming visible. By fall, the nymphs have grown into larger juveniles and young adults that feed voraciously to build energy reserves for winter. The heaviest turf damage in Georgia typically shows up from August through October, when the crickets are big enough to tunnel aggressively and eat large amounts of root material.
How to Confirm You Have Mole Crickets
The standard method is a soapy water flush. You mix about two tablespoons of liquid dish soap into a gallon of water and pour it over a two-to-three-square-foot area of turf where you suspect activity. The soapy water irritates the mole crickets and drives them to the surface within a few minutes. Researchers use this same technique to assess mole cricket species composition and population density on turf.3Environmental Entomology. Effect of Soil Moisture and Time of Year on Mole Cricket (Orthoptera: Gryllotalpidae) Surface Tunneling If you flush out two or more mole crickets per square foot, you likely have a population worth treating.
The best time to do a soapy flush in Georgia is late June through July, after eggs have hatched and nymphs are small. Small nymphs are easier to kill with insecticides or biological controls than large adults, so early detection during the nymph stage gives you the widest window for effective treatment.
When you pull a mole cricket out of the ground, the identification is unmistakable. They look like a small, stocky, velvety-brown insect with massively enlarged front legs built for digging. Those forelegs are powerfully adapted, with hardened claw tips that contain higher concentrations of metals like manganese and zinc than the rest of the claw, making them tougher for cutting through soil.4PLoS ONE. Structure, mechanics and material properties of claw cuticle from mole cricket Gryllotalpa orientalis Adults range from about one to one-and-a-half inches long. They also have functional wings and can fly, which surprises people who think of them as purely subterranean.
Chemical Control Options
For Georgia lawns and turf, chemical treatments are the most widely used approach. The timing and formulation matter more than the specific active ingredient. Treatments applied in June or July, targeting small nymphs, are far more effective than treatments aimed at large nymphs or adults later in the year. Larger mole crickets are harder to reach in their deeper tunnels and are physiologically more tolerant of insecticides.
Granular insecticides are spread over the turf and watered in so the active ingredient moves into the root zone where mole crickets are tunneling. Liquid drenches accomplish the same thing. Products containing bifenthrin, imidacloprid, or fipronil are commonly used in Georgia for preventive or early-season treatments. Bait formulations that contain toxicants mixed with grain-based attractants can work well for spot treatments or for targeting adults in spring, because mole crickets forage on the surface at night and encounter the bait directly.
The key mistake homeowners make is treating too late. By September or October, when the damage is obvious, the mole crickets are large and deep, and chemical treatments give inconsistent results. Treating in early summer when nymphs are small and feeding near the surface gives the best return on effort.
Biological Control Agents
Georgia benefits from several biological control agents that were introduced to combat invasive mole crickets, particularly in Florida and neighboring states where the research was pioneered.
The parasitic nematode Steinernema scapterisci is one of the most studied biological tools. When applied to infested turf, it infects mole crickets and kills them over a period of days. In golf course trials, plots where the nematode established successfully saw trap catches of mole crickets drop by roughly 68% in the second year after treatment. The nematode also spread naturally from treated plots to untreated areas nearby, reducing populations even on control plots.5Environmental Entomology. Inoculative Release of Steinernema scapterisci (Rhabditida: Steinernematidae) to Suppress Pest Mole Crickets (Orthoptera: Gryllotalpidae) on Golf Courses This self-spreading ability is what makes nematode releases an “inoculative” strategy rather than a one-shot treatment: you introduce them once, and if conditions are right, they persist and keep suppressing the cricket population over multiple seasons.
The parasitoid wasp Larra bicolor, originally from South America, was introduced to Florida for mole cricket control and has since spread into adjacent states, including portions of the Gulf Coast. The wasps are active from June through October, coinciding with the period when mole crickets are most vulnerable.6Applied Turfgrass Science. Seasonal and Diurnal Activity of Larra bicolor (Hymenoptera: Crabronidae) and Potential Ornamental Plants as Nectar Sources Female wasps sting mole crickets, temporarily paralyzing them, and lay an egg on the cricket’s body. The larva then feeds on the cricket and kills it. Planting nectar-producing wildflowers near turf areas can help sustain Larra bicolor populations by providing food for the adult wasps when they are not hunting.
Neither nematodes nor wasps provide the instant knockdown that a chemical application does. They are slower-acting, population-level tools that work best as part of a longer-term management plan. For golf course superintendents and sod farmers in Georgia who deal with mole crickets year after year, integrating biological controls with targeted chemical treatments can reduce the need for repeated insecticide applications.
When Mole Crickets Are Not Actually the Problem
One common mistake in Georgia is blaming mole crickets for turf damage that has a different cause. Chinch bugs, armyworms, and grub worms (the larvae of June beetles and Japanese beetles) also damage warm-season grasses like bermudagrass and zoysiagrass. Drought stress can mimic mole cricket damage too, producing irregular brown patches with weakened roots.
The soapy flush test resolves this quickly. If you flush and nothing comes up, mole crickets are not your problem. Grub damage also has a distinctive feel: grub-damaged turf rolls back like a carpet because the grubs have eaten the roots horizontally across a wide area, while mole cricket damage produces more uneven, patchy thinning with visible tunneling ridges.
It is also worth knowing that mole cricket damage is overwhelmingly a warm-season grass issue in Georgia. Bermudagrass lawns, bahiagrass pastures, and St. Augustinegrass yards in the southern half of the state are the most affected. If you have a fescue lawn in the Georgia mountains, mole crickets are unlikely to be a significant concern because both the cooler climate and heavier clay soils are less hospitable.
The Surprising Upside of Mole Cricket Tunneling
Mole crickets are treated almost exclusively as pests, but their tunneling does have a measurable effect on soil hydrology. In field studies on bermudagrass, plots where mole crickets were actively tunneling showed a 41% reduction in surface water runoff and 12% greater water infiltration compared to turf without mole cricket activity.7Applied Soil Ecology. Biopores from mole crickets (Scapteriscus spp.) increase soil hydraulic conductivity and infiltration rates The tunnels, called biopores, create pathways for water to move through the soil rather than running off the surface. In pastures or low-maintenance turf where some cosmetic damage is tolerable, the improved water movement can be a genuine benefit.
The flip side is that those same biopores can also move dissolved fertilizers and pesticides deeper into the soil profile and potentially toward groundwater. In areas with shallow water tables, like parts of Georgia’s Coastal Plain, this is something turf managers keep in mind when applying chemicals to mole-cricket-infested turf. The very tunnels you are trying to treat can carry the treatment chemicals where you do not want them to go.
What Makes Mole Crickets So Good at Digging
For an insect barely over an inch long, mole crickets are remarkably capable excavators. Their forelegs are broad, flat, and equipped with claw-like dactyls that function like miniature shovels. The structural engineering of these claws is surprisingly sophisticated. The tips of the claw teeth are made of dense, uniform cuticle that is harder than the material at the base, where the structure shifts to a layered arrangement that resists cracking under repeated stress.8PLoS ONE. Structure, mechanics and material properties of claw cuticle from mole cricket Gryllotalpa orientalis In effect, the tip is a hard cutting edge and the base is a shock absorber, all within a single tiny appendage.
Beyond digging, mole crickets can walk, run across the surface, swim, and fly. Researchers describe them as one of the most versatile locomotion systems in the insect world, moving effectively both above and below ground.9Journal of Bionic Engineering. Multiple Locomotion Gaits in the Mole Cricket This versatility is part of why they are so successful as invasive species. They can fly to colonize new areas, burrow immediately upon landing, and exploit underground food sources that most surface-dwelling insects cannot reach. Their range of movement has even attracted attention from engineers looking for inspiration for multi-terrain robots.
Managing Expectations for Georgia Lawns
Complete eradication of mole crickets from a Georgia property is not a realistic goal. The insects fly, they recolonize from surrounding areas, and they reproduce underground where they are difficult to monitor. The practical objective is suppression: keeping populations low enough that turf damage stays within tolerable limits.
For most homeowners in the southern half of Georgia, a reasonable management calendar looks something like this:
- March through May: Listen for calling males on warm evenings. Note where surface tunneling appears after rains. Apply bait-type products if adult activity is heavy.
- Late June through July: Do soapy water flushes to confirm nymphs are present and gauge population size. Apply granular or liquid insecticide targeting nymphs while they are small and shallow.
- August through October: Monitor damage levels. Spot-treat if damage is concentrated in specific areas, but recognize that large nymphs and adults are harder to control.
- November through February: No treatment needed. Mole crickets are deep in the soil and inactive.
Keeping turf healthy through proper mowing, fertilization, and irrigation also helps. A dense, vigorous stand of bermudagrass can tolerate moderate mole cricket activity without showing severe damage. Thin, stressed turf falls apart under the same level of tunneling. In that sense, good general lawn care is itself a form of mole cricket management, not by killing the insects but by making the grass resilient enough to outgrow the damage they cause.