Chafer Nematodes

Chafer grubs are pests that cause yellow patches and slow grass growth in lawns. These grubs feed on grass roots, weakening the turf and making it susceptible to further damage and disease.

Chafer grubs primarily damage grasses, causing brown patches on lawns and turf by feeding on the roots but they can also harm crops, ornamental plants, and young trees by eating their roots, leading to stunted growth and weakened plants.

What are chafer grubs and how do I recognise them?

To recognise a chafer grub, look for a C-shaped, creamy-white larva with a brown head and six prominent legs near the front. They are usually about 1.5–3 cm long, with a darker, swollen abdomen, often visible through the skin.

These grubs are typically found in soil, especially in grassy areas, where they feed on roots, causing patches of dead or damaged grass.

What damage do chafer grubs do? 

Damage caused by chafer grubs typically appears as irregular patches of dead or dying grass in lawns or turf. The grass may easily lift away from the soil, as the grubs feed on the roots, weakening the plants.

You might also notice increased activity from birds or other animals digging up the turf to feed on the grubs. The affected areas can turn brown and thin out, especially during late summer and early fall when the grubs are most active.

When and How to Apply Chafer Grub Nematodes

Best Time for Application: Apply chafer grub nematodes from August to October for optimal results. Depending on pest activity and environmental conditions, they can still be effective outside this period.

Chafer nematodes application instructions: Each pack treats up to 100 square metres. Keep the nematodes refrigerated until use and apply them by the expiry date, typically around 2 weeks after delivery.

Note that as live organisms, nematodes cannot be returned. Can apply with any nematode applicator.

See frequently asked questions on chafers and their larvae