Mole crickets in your lawn — how to spot them and shut them down

If your lawn has started looking like someone took a corkscrew to it from underneath — raised ridges of soil, finger-sized holes, spongy patches that sink when you walk on them — you may have mole crickets. These bizarre underground crickets cause some of the most expensive lawn damage in the southern US, coastal Australia, and South Africa. The damage looks dramatic, but a confirmed mole cricket problem is very treatable if you act at the right time. Let's walk through how to identify them, confirm with a simple test, and shut them down.

What mole crickets actually are

Mole crickets are large brown crickets — about the size of your thumb — with thick spade-like front legs built for digging. They live underground, burrowing through the top few inches of soil. Adults can fly. The damage comes from a combination of three things:

• Tunnelling that loosens the soil and breaks roots
• Feeding on grass roots and tender stems
• Egg-laying which produces nymphs that do even more damage

They are most active in warm, damp soil. That is why coastal Florida, Texas, Queensland, KwaZulu-Natal, and parts of the Eastern Cape see the worst infestations.

The big idea on timing: mole crickets are easiest to kill when they are small. Late spring and early summer treatments hit the nymphs (young crickets) before they grow into the bigger, harder-to-kill adults. By late summer it is much harder to control them. Get the timing right and the rest is easy.

How to identify mole cricket damage

Several telltale signs separate mole crickets from grubs or chinch bugs:

Loose, raised soil

Tunnels just below the surface push up little ridges or mounds, like miniature molehills. Walk on the lawn and the surface gives a bit underfoot. That spongy feel is the dead giveaway.

Finger-sized holes

You may see actual entry holes at the soil surface — about the diameter of a pencil. Often in clusters.

Spreading brown patches

Yellow or brown patches that grow larger over weeks, with grass that thins out from the centre. The damage spreads along the tunnel paths.

Worst damage at dawn and dusk

Mole crickets feed at the surface in the evening and overnight. If you walk the lawn at dusk with a torch you may actually see them moving around.

Bird and animal activity

Birds, raccoons, possums, or skunks digging in the lawn at night are often hunting mole crickets. If the soil has been torn up by wildlife, something is living down there.

The soap-flush test — your confirmation step

Before you spend money on insecticide, do the soap-flush test. It is the cheapest and most reliable way to confirm mole crickets.

What you need

• A watering can or 9-litre (2-gallon) bucket
• 2 tablespoons of liquid dish soap (any brand — Sunlight, Dawn, Fairy)
• Water

How to do it

1. Mix the soap into the water — do not foam it up too much, just stir.
2. Pour slowly over a 1-metre square section at the edge of a suspected damaged area.
3. Wait 2–3 minutes.

If mole crickets are present, they will come up out of the soil within minutes, trying to escape the soap. You will see them wriggling on the surface — large brown crickets with shovel-like front legs.

What it means

• More than 2–4 crickets per square metre: treatment time. Worth doing now.
• 1–2 crickets: monitor, but probably not urgent.
• None: not your problem. Check for grubs or chinch bugs instead.

Treatment options by region

The right product depends on where you live. All three regions have effective options, but the active ingredients and brand names differ.

Australia

Mole crickets show up in coastal Queensland, northern NSW, and pockets of the Northern Territory. Common in Buffalo, couch, and kikuyu lawns.

• Bifenthrin-based granular products: Richgro Beat-A-Bug Insect Killer Granular or Yates Grub Kill & Protect. Spread evenly with a hand spreader.
• Acelepryn GR: a longer-lasting professional product, available at specialist turf suppliers. Best preventive option.
• Where to buy: most Bunnings garden centres stock the Richgro and Yates options.

United States

The big mole cricket states are Florida, Georgia, Alabama, the Carolinas, and parts of Texas. Bermuda and bahia lawns get hit hardest.

• Bayer Advanced 24-Hour Grub Killer Plus: trichlorfon-based, works fast. Available at Home Depot and Lowe's.
• Scotts GrubEx: chlorantraniliprole — long-lasting and good for prevention.
• Spectracide Triazicide Insect Killer Granules: broad-spectrum, hits mole crickets and other surface pests.

South Africa

Mole crickets are widespread in KwaZulu-Natal, Eastern Cape, and parts of Gauteng. Kikuyu, Buffalo, and Gulf Green Bermuda are common hosts.

• Efekto Karbasol: carbaryl-based, effective on mole crickets. Available at most garden centres.
• Efekto Mole Cricket Bait: a targeted bait that mole crickets feed on directly.
• Where to buy: most Builders Warehouse, Stodels, and Garden World stores.

Timing — the single biggest factor

Get this right and you save yourself a season of damage.

Spring (late spring is the sweet spot)

This is the window. Adults that survived winter lay eggs in late spring. The nymphs hatch and start feeding. They are small, less mobile, and easy to kill.

• Australia (QLD, NSW north coast): October–November
• United States (Gulf states): May–June
• South Africa: September–October

Apply your chosen product in late afternoon. Water it in lightly — about 15 minutes with a sprinkler. The chemical needs to soak down to where the nymphs are living, but you do not want to flush it past them.

Summer

Treatment still works, but the adults are bigger and harder to kill. You may need a second application 2–3 weeks after the first.

Autumn and winter

Less effective. The crickets are deeper in the soil and feeding less.

Pro tip: time your treatment with the weather. Treat in the evening of a warm day with showers forecast for the morning. The mole crickets will come up to feed, hit the chemical, and the morning rain will help it move into the soil.

What to do while the treatment works

After applying, give it 7–10 days. Then re-do the soap flush test to confirm the population has dropped. You should see far fewer crickets coming up.

Repair the damage

Once the crickets are dead and the soil is firmer:

• Roll or tamp down the raised ridges with a lawn roller, the back of a rake, or just by walking the area methodically.
• Top-dress sunken or torn areas with a thin layer of sandy soil mix (5–10mm).
• Over-seed thin patches with fresh seed appropriate to your grass type.
• Water deeply twice a week for a few weeks to help the grass bounce back.
• Feed lightly — a nitrogen fertiliser like Lawn Solutions Premium (AU), Scotts Turf Builder (US), or Wonder Lawn & Leaf Food (ZA) helps the lawn recover faster.

Prevention — making the lawn less attractive

Mole crickets prefer loose, moist soil. A few habits make your lawn a less appealing home:

• Reduce overwatering. Mole crickets love wet sandy soil. Deep, not very frequent watering is less inviting than daily light sprinkles.
• Keep the lawn dense. A thick lawn with a strong root mat is harder to tunnel through. Regular feeding and overseeding builds this.
• Spread a preventive treatment in spring. Acelepryn GR (AU) or Scotts GrubEx (US) lasts months and prevents nymphs from establishing.
• Watch outdoor lights. Mole cricket adults fly to lights at night during their swarming season. If you see them swarming, treatment time is here.

What if treatment is not working?

A few common reasons treatment fails:

• Wrong timing. Treating adults in late summer is far less effective than nymphs in spring.
• Not watered in. The chemical needs to reach the soil layer where mole crickets live.
• Wrong product. Some products kill only adults. Bait products work for mole crickets specifically.
• Reinfestation from neighbours. If your neighbours' lawns are untreated, adults fly in. Coordinate treatment if you can.
• Misdiagnosis. Grubs and chinch bugs cause similar damage. Re-run the soap flush test — if no crickets come up, treat for the actual culprit.

How Lawnova helps with mole cricket timing

Lawnova flags pest risk based on your region and current weather conditions. So in coastal Queensland in October, or coastal Florida in May, you will get a heads-up: "Mole cricket nymphs hatching now — check for damage." That prompt alone catches most infestations early enough to make treatment quick and cheap.

Sign up here and let us watch the calendar so you do not have to.

Stay tunnel-free.