Mole crickets are one of the most destructive lawn pests found across Australia, particularly in warmer coastal regions. These unusual insects live beneath the soil surface and are named for their large, spade-like front legs, which are perfectly adapted for digging. While they spend most of their time underground, the damage they leave behind is highly visible.
Mole crickets tunnel just below the surface of the soil, feeding on grassroots, organic matter and sometimes small insects. As they burrow, they loosen the soil and sever root systems, causing grass to dry out and die. You may notice raised tunnels, spongy or uneven ground, and irregular brown patches spreading across your lawn. Turf can often be lifted easily due to weakened roots. Damage is typically worse during spring and summer when mole crickets are actively breeding and feeding.
Prevention starts with maintaining a strong, healthy lawn. Thick, well-established turf is far more resilient to pest damage. Mow regularly at the correct height for your grass type and avoid cutting too short, as this weakens root systems. Fertilise appropriately to promote dense growth that can better withstand minor feeding activity.
Water management is also critical. Mole crickets are attracted to consistently moist soil. Overwatering creates ideal breeding conditions and soft soil that makes tunnelling easier. Instead, water deeply but less frequently to encourage deeper root growth and reduce surface moisture. Improving drainage in problem areas can also help deter infestations.
Reducing thatch build-up is another effective prevention strategy. Excess thatch provides shelter and protection for mole crickets. Regular aeration helps relieve soil compaction, improves oxygen flow to roots, and disrupts underground tunnels. Aerating during active growth periods allows the lawn to recover quickly while making conditions less favourable for pests.
For natural control, beneficial nematodes can be applied to the soil. These microscopic organisms target mole cricket nymphs and help reduce populations before they reach adulthood. Timing is important, as treatments are most effective against young crickets.
If an infestation is severe, professional pest control treatments may be necessary. Targeted applications can significantly reduce mole cricket numbers and prevent ongoing damage. Early detection is essential — the sooner you address the issue, the easier it is to restore your lawn.
A proactive lawn care program focused on healthy soil, proper irrigation, and regular maintenance remains the best long-term defence against mole crickets and the costly damage they cause.
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