Mole cricket damage in southern lawns
Mole crickets are among the most economically significant turfgrass pests in the southeastern United States. They are also among the most unusual -- large, soil-burrowing insects with distinctive paddle-like forelegs adapted for digging that create visible tunnel networks at the soil surface. Most.
—- title: "Mole cricket damage in southern lawns" slug: lawn-mole-cricket hub: lawn category: "Lawn guide" description: "Identify and manage mole cricket damage in southern lawns: species differences, tunneling signs, nematode biocontrol, and insecticide timing on bahia, bermuda, and St. Augustine grass." date: 2026-06-10 updated: 2026-06-10 author: "Thomas A." reading_time: 8 —-
Mole crickets are among the most economically significant turfgrass pests in the southeastern United States. They are also among the most unusual — large, soil-burrowing insects with distinctive paddle-like forelegs adapted for digging that create visible tunnel networks at the soil surface. Most of the damage occurs underground, which makes both detection and treatment timing more complex than for surface-feeding insects.
Species in the United States
Per UF IFAS Extension, three non-native mole cricket species are the primary pests in the Southeast. A fourth, the native mole cricket, is not a significant pest:
| Species | Primary range | Notes |
|---|---|---|
| Tawny mole cricket (Neoscapteriscus vicinus) | Florida, Gulf Coast | Most damaging; omnivore |
| Southern mole cricket (Neoscapteriscus borellii) | Florida, Gulf Coast | Primarily insect predator; still tunnels |
| Short-winged mole cricket (Neoscapteriscus abbreviatus) | Florida (south) | Short-winged; does not fly |
Per Texas A&M AgriLife Extension, tawny mole crickets are established in coastal areas from Florida to Texas and are the primary species causing damage in bahia grass and bermuda grass lawns.
Life cycle
Per UF IFAS Extension:
- Adults fly in warm, humid nights in late March through May — a single night's flight of thousands of adults may colonize an area
- Eggs are laid in egg pods (25—60 eggs) in soil chambers at 4—8 inch depth, late April through June
- Nymphs emerge in June; early nymphs are most vulnerable to insecticide
- Nymphs grow through 8 instars over summer, with substantial feeding and tunneling from June through October
- Adults emerge the following spring
The single-generation-per-year life cycle means management timing in June—July (when nymphs are small and near the surface) is the most critical window.
Damage symptoms
Per UF IFAS Extension:
- Surface ridges — raised, irregular tunnels at the soil surface, particularly visible in the morning on moist soil
- Root disruption — loosened soil around roots allows desiccation; tunnels sever small roots
- Turf thinning and death — irregular areas of thinning bahia or bermuda grass, especially in summer
- Spongy turf — heavy tunneling loosens the soil-root interface
Diagnosis: soap flush
Per UF IFAS Extension, the soap flush test works for mole crickets: dilute 1.5 oz of lemon-scented dish soap in 2 gallons of water; pour over 4 square feet in an area with fresh tunnel activity. Mole crickets emerge within 2—3 minutes if present. Populations of 2—4 per square foot in young nymphs (June—July) warrant treatment.
Management
Biological control — the durable option
Per UF IFAS Extension, the most successful long-term management tool in Florida is the entomopathogenic nematode Steinernema scapterisci, which was mass-reared and released in Florida starting in 1985. This nematode is specific to mole crickets (it does not kill other insects) and establishes in the soil, spreading and building up populations over years.
Apply S. scapterisci nematodes in June or July when young nymphs are present in the top 3 inches of soil. Results improve over 2—3 seasons as nematode populations establish. Per UF IFAS Extension, bahia grass lawns in central Florida where this nematode has been released show substantially reduced mole cricket populations compared to untreated sites.
Insecticides
Per Texas A&M AgriLife Extension, insecticide applications are most effective in late June to early July when nymphs are small:
| Insecticide | Application | Notes |
|---|---|---|
| Imidacloprid | Granule or liquid | Apply before peak flight; 4-week pre-plant interval |
| Bifenthrin | Granule or liquid | Fast knockdown; requires watering in |
| Chlorantraniliprole | Liquid | Excellent activity; systemic |
| Fipronil | Granule | Good soil activity against tunneling crickets |
Per UF IFAS Extension, apply insecticides in late afternoon; water in with 0.5 inch of irrigation immediately after application to move the chemical into the top 3 inches of soil where nymphs are feeding.
Bait formulations (e.g., hydramethylnon or indoxacarb baits) can be effective when applied to moist soil at dusk — mole crickets surface and feed on the bait at night. Per UF IFAS Extension, baits are most effective from May through July.
Monitoring adult flights
Per UF IFAS Extension, setting a light trap or soapy water trap on warm, humid nights in March—May indicates local adult population levels. High flight activity in spring predicts high nymph pressure in June—July.
Common problems
| Symptom | Likely cause | Action |
|---|---|---|
| Raised ridges on turf surface | Tunneling adults or nymphs | Soap flush to confirm; inspect timing vs. life cycle |
| Thinning bahia or bermuda grass | Root disruption from tunneling | Soap flush; apply nematodes or insecticide in June—July |
| Treatment ineffective in fall | Nymphs now adults; harder to control | Wait until next June for nymph-stage treatment |
| Recurrent annual damage | Established population | Nematode biocontrol program for multi-year improvement |
Frequently asked questions
Do mole crickets bite? Per UF IFAS Extension, mole crickets can pinch if handled but are not venomous and are not aggressive toward humans. They pose no health risk.
Why are mole crickets a bigger problem in Florida than other states? Per UF IFAS Extension, the tawny and southern mole cricket species were introduced from South America in the early 1900s, likely via ship ballast. Their natural predators and parasites did not accompany them. Without biological regulation, populations built up to levels far exceeding their native range. The biocontrol program with S. scapterisci is gradually reestablishing predator pressure.
Can I use beneficial nematodes from a garden center for mole crickets? Per UF IFAS Extension, most commercially available entomopathogenic nematodes (Steinernema feltiae, Heterorhabditis bacteriophora) are not effective against mole crickets. The species-specific nematode Steinernema scapterisci is needed. It is available from specialty biological control suppliers.
How deep do mole crickets tunnel? Per Texas A&M AgriLife Extension, mole crickets tunnel at 2—6 inches depth during active feeding and move deeper (12+ inches) to overwinter or to escape heat and drought. This is why irrigating before insecticide application is critical — it brings crickets to the top 3 inches where insecticide reaches them.
Sources
- UF IFAS Extension — Mole Cricket Management
- Texas A&M AgriLife Extension — Mole Crickets in Turf
- NC State TurfFiles — Turfgrass Insect Pests