If you are looking for a natural way to control chafer grubs in your lawn, chafer nematodes are a popular option for reducing root feeding pests in soil. Chafer nematodes target chafer grubs below the surface, helping protect grass roots and support healthier lawn growth.
Suitable for lawns, turf, and garden areas, they are commonly applied when young grubs are active and soil temperatures are warm enough in UK conditions. Watering before and after application helps support nematode activity and improve coverage in the soil.
What are chafer grub nematodes?
Chafer nematodes are microscopic organisms used in lawn soil to target chafer grubs and help reduce root damage in grass.
How do chafer nematodes work in lawn soil?
They enter chafer grubs in the soil and release bacteria, which stops them feeding and reduces damage to the lawn.
What are chafer grubs and why do they damage lawns?
Chafer grubs are the larvae of chafer beetles. They feed on grass roots, leading to brown patches and weakened turf.
Are chafer nematodes safe for pets and children?
Yes, chafer nematodes are safe for pets, children, and wildlife when applied as directed.
Do chafer nematodes harm grass or plants?
No, they do not harm grass or plants and are used to help protect lawns from root feeding pests.
How do I apply chafer nematodes to a lawn?
Mix the nematodes with water and apply evenly across moist lawn soil using a watering can or sprayer.
When is the best time to apply chafer nematodes in the UK?
The best time is when young chafer grubs are active, usually between late spring and early autumn depending on species.
Can chafer nematodes be applied in wet weather?
Yes, damp conditions help them move through the soil, but avoid heavy rain that may wash them away.
Do I need to water the lawn before applying chafer nematodes?
Yes, watering beforehand helps create the moist conditions needed for nematode movement.
How long should the lawn stay moist after application?
Keep the lawn moist for at least two to three weeks after application to support nematode activity.
How long do chafer nematodes take to work?
Results can begin within a few days, with continued improvement over a couple of weeks.
Do chafer nematodes kill all chafer grubs?
They reduce grub populations in the soil, but repeat treatments may be needed in severe infestations.
Can chafer grubs return after treatment?
Yes, adult beetles can lay eggs again, so future treatments may be required during active periods.
How often should chafer nematodes be applied?
Apply during the main treatment window, with repeat applications if pest levels remain high.
Do chafer nematodes work on large chafer grubs?
They are most effective on smaller, younger grubs, so timing is important.
What soil temperature is needed for chafer nematodes?
Soil temperature should generally be at least 12°C for chafer nematodes to be active.
Can chafer nematodes be used on dry lawns?
No, the soil must be moist before and after application for best results.
Do chafer nematodes work in clay soil?
Yes, as long as moisture is maintained, they can move through clay soil.
Can chafer nematodes be used on newly laid turf?
Yes, they can be applied to new turf if chafer grubs are present and soil is kept moist.
Are chafer nematodes suitable for all lawn types?
Yes, they can be used on most lawn types including ornamental and general use lawns.
How should chafer nematodes be stored?
Store in a fridge or cool place and use before the expiry date shown on the packaging.
Do chafer nematodes have an expiry date?
Yes, always use before the expiry date to ensure activity.
Can chafer nematodes be used after expiry?
No, activity may be reduced after expiry so it is not recommended.
How much area do chafer nematodes cover?
Coverage depends on pack size and the application rate stated on the product.
Can chafer nematodes be applied in stages?
Once mixed with water, they should be used straight away, though packs can sometimes be split before mixing.
Can chafer nematodes be mixed with lawn feed?
It is best to apply them separately unless product instructions advise otherwise.
Are chafer nematodes suitable for organic lawn care?
Yes, they are widely used in organic lawn care programmes.
Do chafer nematodes affect earthworms?
No, they are specific to chafer grubs and do not harm earthworms or beneficial soil life.
Can chafer nematodes be used with other lawn treatments?
Yes, but avoid applying alongside incompatible treatments at the same time.
Do chafer nematodes work all year round?
No, they work best during the correct treatment period when soil temperatures are suitable and grubs are present.
How do I tell if I have leatherjacket or chafers?
The two pests are completely different, see the image below.
You can also use chafer grub traps
