Leatherjacket Lawn Treatment Nematodes 500sq.m

Protect your lawn from leatherjacket damage with this highly targeted nematode treatment. Leatherjackets are the larvae of crane flies (daddy-long-legs) and feed on grass roots, leading to thinning grass, yellow patches, and weak lawns.

This treatment uses natural nematodes to manage leatherjacket infestations without chemicals.

Apply when adult crane flies are visible, usually in late summer. Eggs hatch within two weeks, so early treatment is essential. The microscopic nematodes penetrate the larvae, stopping them before they cause further damage to the lawn. Suitable for use in UK climates.

When to Apply Leatherjacket Nematodes in the UK

Leatherjacket nematodes can be applied from Spring to late October but the ideal time to apply them is from late August through to October, when leatherjackets are hatching and actively feeding. Treatment can also be carried out in Spring if signs of damage continue.

Nematodes are unaffected by a light frost and can continue working even with fluctuating temperatures. They are supplied with full instructions and can be applied using a watering can or a nematode applicator. Ensure soil does not dry out post-application for effective pest control.

Nematodes are Safe for Pets, Children and Wildlife

This leatherjacket lawn treatment is a biological solution using live nematodes, not chemicals. It is completely safe to use in areas accessed by children, pets, and wildlife. There is no need to keep anyone off the lawn after application. Nematodes are a natural part of soil ecosystems and will not harm beneficial insects or animals.

How to Identify Leatherjackets in Your Lawn

Leatherjackets appear worm-like, grey-brown, and legless compared to chafer grubs which are white, C-shaped with orange heads and six legs. Signs of an infestation include thinning grass, yellow patches, and grass that pulls up easily from the soil. Treat as soon as adult crane flies are seen, to catch larvae before they feed aggressively.

This product includes live nematodes for leatherjacket control, with instructions. Apply with a watering can or applicator to moist soil. Delivery is free for nematode-only orders. Due to being a live product, nematodes are non-returnable and typically have a two-week shelf life from dispatch.

You can find a 100 square metre pack of nematodes here. 

Frequently Asked Questions on LeatherJacket Lawn Nematodes

• What size garden can the 500 sq.m pack treat?

  This bulk pack covers lawns up to 500 square metres, making it ideal for larger gardens or heavy infestations. Use it all at once, or reserve part of the pack for a follow-up treatment.

• How long do Leatherjacket Nematodes remain effective once delivered?

  These are live organisms with a shelf life of approximately 2 weeks if stored in the fridge. Once mixed with water, apply immediately—do not store the solution.

• When is the best time to apply the 500 sq.m nematode treatment?

  Apply from late August to October when crane fly eggs hatch and larvae are active near the surface. A spring application may also help if leatherjacket activity continues.