Natural Predators of Southern Mole Crickets:
Who Eats Them?

The southern mole cricket (Scapteriscus borellii) is a burrowing insect notorious for damaging turfgrass, lawns, and agricultural crops in the southeastern United States. These subterranean pests disrupt roots and soil structure, leading to weakened plants and reduced yields. While their presence often spells trouble for gardeners and farmers, southern mole crickets also play a role in the food web as prey for various natural predators. Understanding who eats southern mole crickets can provide insight into natural pest control methods and help develop sustainable management strategies.

In this article, we explore the natural predators of southern mole crickets, covering a diverse range of animals that feed on them and their eggs across different life stages.

Overview of Southern Mole Crickets

Before diving into their predators, it helps to know some basics about the southern mole cricket:

• Habitat: Southern mole crickets primarily inhabit moist, sandy soils in warm climates. They prefer lawn areas, pastures, golf courses, and agricultural fields.
• Behavior: These insects spend most of their lives underground, using powerful forelimbs to dig extensive tunnel systems. They feed on plant roots, causing damage that leads to wilting and turf death.
• Life Cycle: Southern mole crickets undergo incomplete metamorphosis. Eggs hatch into nymphs resembling smaller adults; both nymphs and adults live underground.
• Impact: Their tunneling behavior causes physical damage, while feeding harms plant health.

Because these pests are subterranean and cryptic, many people may be unaware of the natural predators that target them beneath the soil surface.

Insectivorous Birds

Many bird species rely on insects as a primary food source, and several have adapted to hunt subterranean prey like mole crickets.

Northern Mockingbird (Mimus polyglottos)

The northern mockingbird is common in southern U.S. habitats where southern mole crickets thrive. These birds forage by scratching at soil and leaf litter to uncover insects. During peak mole cricket activity in spring and summer, mockingbirds consume adult mole crickets and nymphs that come near the surface.

Eastern Bluebird (Sialia sialis)

Eastern bluebirds hunt primarily on open ground and grasslands. They have been observed catching mole crickets during their emergences or when they burrow close to the surface at night. Bluebirds can significantly reduce local mole cricket populations by preying on vulnerable life stages.

Other Ground-Foraging Birds

Species such as robins, starlings, meadowlarks, and killdeer also incorporate mole crickets into their diets when available. These birds use keen eyesight and probing bills to locate insects hidden just below soil or turf.

Mammalian Predators

Several small mammals supplement their diets with insects including southern mole crickets.

Moles (Scalopus aquaticus)

Ironically named “moles,” these insectivorous mammals tunnel through soil hunting earthworms, grubs, and various soil-dwelling insects such as mole crickets. Their digging behavior overlaps with mole cricket habitats, enabling them to prey extensively on both nymphs and adults underground.

Shrews (Sorex spp.)

Shrews are tiny insectivores with voracious appetites for soil arthropods. Because they forage through leaf litter and shallow soil layers frequently inhabited by mole crickets, they consume significant numbers of these insects throughout the year.

Armadillos (Dasypus novemcinctus)

Armadillos excavate soil looking for insects including beetle larvae and crickets. Their powerful claws tear into topsoil layers where southern mole crickets construct tunnels making them effective predators of surface-active individuals or those close to emergence.

Raccoons (Procyon lotor)

Raccoons are opportunistic feeders consuming a wide variety of animal prey including large insects like adult mole crickets during nighttime foraging excursions.

Reptilian Predators

Reptiles that inhabit lawns or fields may also prey on southern mole crickets when given the opportunity.

Fence Lizards (Sceloporus spp.)

Fence lizards actively hunt arthropods on the ground surface. When mole crickets emerge or are displaced from tunnels during soil disturbance, lizards capture them with quick bursts of speed.

Skinks

Skinks are generalist insectivores that consume many types of insects including burrowing species exposed by digging or rainfall events.

Snakes

While snakes usually target larger prey like rodents or amphibians, some small species eat insects opportunistically. Juvenile snakes may snap up exposed adult or nymph mole crickets when foraging close to the ground.

Amphibian Predators

Frogs and toads living in moist habitats overlap with southern mole cricket ranges.

American Toad (Anaxyrus americanus)

American toads forage at night feeding heavily on surface-active insects including adult mole crickets especially during wet seasons when these insects move closer to ground level during mating flights or dispersal events.

Green Frogs (Lithobates clamitans)

Green frogs consume various arthropods near ponds or wet grasslands adjacent to cricket-infested areas including occasional surface-exposed mole crickets.

Arthropod Predators

In addition to vertebrate predators, several predatory arthropods feed on southern mole crickets.

Ground Beetles (Carabidae)

Ground beetles hunt small invertebrates on soil surfaces at night. Larger species are capable of overpowering juvenile or injured adult mole crickets when they come above ground.

Spiders

Certain spiders like wolf spiders chase down insect prey actively rather than trapping it in webs. Wolf spiders’ speed allows them to catch escaping adult or nymphal mole crickets in open areas exposed by digging or lawn maintenance activities.

Parasitic Wasps (e.g., Larra bicolor)

One particularly interesting biological control agent is the parasitoid wasp Larra bicolor, which specifically targets southern mole crickets. Adult female wasps locate adult moles by scent; after stinging and paralyzing the host, they lay eggs on the cricket’s body. Wasp larvae then develop externally by consuming the cricket alive but typically do not kill it immediately. This parasitic relationship naturally suppresses local populations by reducing reproductive success.

Factors Affecting Predator Efficiency

Predation rates on southern mole crickets depend on multiple factors:

• Soil Type & Moisture: Hard compacted soils reduce predator access; moist sandy soils allow easier tunneling for moles and access for birds probing.
• Vegetation Cover: Dense turf may restrict visual hunting by birds but provide cover for mammalian predators.
• Seasonality: Many predators increase feeding on mole crickets during spring mating flights or after heavy rains bring individuals closer to the surface.
• Human Activity: Lawn mowing, irrigation, and pesticide applications alter predator-prey dynamics by either exposing prey or reducing predator populations unintentionally.

Implications for Pest Management

Understanding natural predation can lead to improved integrated pest management (IPM) strategies:

• Encouraging bird habitats through nesting boxes or reduced pesticide use supports avian predators.
• Maintaining healthy populations of insectivorous mammals like shrews could enhance natural biocontrol.
• Avoiding excessive tillage preserves beneficial ground beetles and parasitic wasps.
• Biological control programs sometimes release parasitoid wasps (e.g., Larra bicolor) deliberately to suppress crop-damaging cricket populations.

By fostering natural predator communities alongside cultural controls like proper irrigation and turf maintenance, homeowners and farmers can reduce reliance on chemical treatments while managing southern mole cricket damage effectively.

Conclusion

Southern mole crickets face predation from a wide array of animals spanning birds, mammals, reptiles, amphibians, and even other arthropods. Each predator type contributes uniquely depending on habitat conditions and seasonal availability of prey life stages. Supporting these natural enemies through habitat conservation and judicious pest control practices provides an eco-friendly avenue to curb this subterranean pest’s impact on turfgrass and crops. Appreciating who eats southern mole crickets highlights nature’s complex food web interactions beneath our feet — an important step toward balanced ecosystem management.