Mole Cricket Damage in Warm-Season Lawns: Complete Guide
Mole Crickets tunnel through Florida lawns, destroying grass roots and leaving spongy, dying turf in their wake. These destructive pests require strategic timing for effective control.
What Mole Cricket Damage Looks Like
Mole Cricket damage creates a distinctive spongy, uneven lawn surface from the tunnels these insects create just below the soil. When you walk across an infested area, the ground feels soft and may give way slightly underfoot. The grass above these tunnels turns brown and dies because the root zone has been disrupted. Damage often appears in irregular patterns following the meandering paths of the tunnels.
Unlike grubs that stay in one place and feed on roots, Mole Crickets are constantly on the move, tunneling through the soil and feeding on roots as they go. Their front legs are specialized for digging, similar to a mole's paws, which is how they got their name. You may see their tunnel entrances - small holes or raised ridges in the soil surface, especially visible after rain or irrigation when the soil is moist.
Mole Cricket damage is most severe in bahiagrass and bermudagrass lawns, though they will damage any turf type. The damage tends to be worse in sandy soils that are easy to tunnel through - which includes most of Florida. You may notice the damage worsens rapidly in late summer and fall when Mole Cricket populations peak and feeding is most intense.
Adult Mole Crickets are large (1-1.5 inches), brown, wingless insects that are rarely seen because they spend most of their time underground. However, on warm, humid evenings, especially after rain, you may see them flying or hear their distinctive chirping sounds - males call to attract mates from their underground burrows. Florida has two main pest species: the Tawny Mole Cricket and the Southern Mole Cricket.
Warm-Season Grasses Affected
When It Strikes in the South
Mole Cricket damage is most severe in Florida from August through November when nymphs are large and feeding heavily. Adults mate and lay eggs in spring (March-May), with eggs hatching in June-July. The small nymphs cause minimal damage at first, but damage accelerates as they grow larger through summer. Adult flight activity peaks on warm, humid evenings in March-May and August-September.
How to Confirm Mole Cricket Damage
- 1Walk across the lawn and feel for spongy areas where the soil gives way - indicates tunneling beneath
- 2Look for raised tunnels or ridges visible on the soil surface, especially after rain
- 3Check for small burrow holes (about the diameter of a finger) in the lawn
- 4Apply soapy water flush test: mix 2 tablespoons dish soap in 2 gallons water, drench 4 sq ft, mole crickets will surface within 3 minutes if present
- 5Listen for chirping sounds on warm, humid evenings - male Mole Crickets call from burrows
Treatment Steps for Mole Cricket Damage
- 1
Determine the best timing: treat nymphs in June-July when they're small and vulnerable, or adults in fall before egg-laying
- 2
Apply a Mole Cricket bait containing fipronil or bifenthrin in the evening when crickets are active
- 3
Alternatively, apply granular insecticide and water in with 0.5 inch irrigation to move product into soil
- 4
Apply beneficial nematodes (Steinernema scapterisci) in spring or fall for biological control
- 5
Mow and rake before treatment to improve insecticide contact with soil
- 6
Make follow-up applications as needed - Mole Cricket control often requires 2-3 treatments per season
Recommended Products
Mole Cricket Bait (Fipronil)
Fipronil-based bait that Mole Crickets eat and share with colony members for thorough control
View on Amazon →Talstar Granular Insecticide
Bifenthrin granular that kills Mole Crickets on contact when watered into soil
View on Amazon →Nematac S Beneficial Nematodes
Steinernema scapterisci nematodes specifically selected for Mole Cricket biological control
View on Amazon →As an Amazon Associate, LawnLens earns from qualifying purchases.
Prevention Tips
- ✓Treat in early summer (June-July) when nymphs are small and easiest to kill
- ✓Apply preventive treatment if Mole Crickets were a problem the previous year
- ✓Maintain healthy, dense turf that tolerates some Mole Cricket activity
- ✓Use beneficial nematodes as a long-term biological control strategy
- ✓Monitor for adult flight activity in spring to predict nymph populations in summer
- ✓Avoid overwatering which creates ideal moist tunneling conditions
Frequently Asked Questions
When is the best time to treat for Mole Crickets in Florida?▼
The most effective treatment window is June-July when nymphs are small (less than 1/2 inch) and vulnerable. Small nymphs are 10-20 times easier to kill than adults. A second effective window is March-May to target adults before egg-laying. Treating large nymphs or adults in late summer is less effective but still reduces populations.
Why is my Bahiagrass more damaged by Mole Crickets than my neighbor's St. Augustine?▼
Mole Crickets prefer bahiagrass and bermudagrass over St. Augustine, though they'll damage any turf. Bahiagrass is also often grown in more rural areas with sandier soils that are easier to tunnel through. Additionally, bahiagrass lawns may receive less intensive pest management than St. Augustine lawns.
Will Mole Cricket damage grow back?▼
Grass that still has intact roots and crowns will recover once Mole Crickets are controlled. However, areas where tunneling completely severed the root system will need to be reseeded or resodded. Water damaged areas well after treatment to encourage recovery, and give the lawn 4-6 weeks before deciding to resod.
What are the chirping sounds I hear at night in summer?▼
That's likely male Mole Crickets calling from their burrows to attract mates. The chirping is most common on warm, humid evenings from March-May and August-September. Hearing this sound indicates Mole Crickets are present and mating, which means eggs and nymphs will follow. Consider preventive treatment if you hear persistent chirping.
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