Leatherjacket Nematodes 500 sq.m Lawn Treatment

This large pack of leatherjacket nematodes is designed for treating bigger lawns or areas with more severe leatherjacket infestations. Leatherjackets are the larvae of crane flies (often called daddy-long-legs) and they feed on grass roots beneath the soil surface, which can lead to yellow patches, thinning turf and weak lawns.

If you are treating a smaller lawn, see our Leatherjacket Nematodes 100 sq.m pack.

How leatherjackets damage lawns

Leatherjackets live below the soil surface and feed on the roots of grass plants. As the roots are eaten, lawns may become patchy or weak and the turf may lift easily from the soil. Birds often peck at affected areas as they search for the larvae.

How leatherjacket nematodes work

When applied with water, the microscopic nematodes move through moist soil and actively seek out leatherjacket larvae. This natural biological process helps reduce larval activity and supports the recovery of healthy grass roots.

When to apply

• Best applied from late August to October
• Spring treatment may help if lawn damage continues
• Apply when soil temperature is above 5°C
• Water after application and keep the soil moist

Signs of leatherjackets in a lawn

• Yellow or thinning grass
• Bare or patchy areas of turf
• Lawn that lifts easily from the soil
• Birds feeding on the lawn
• Grey-brown larvae just below the soil surface

How to apply leatherjacket nematodes

1. Water the lawn before treatment if the soil is dry.
2. Mix the nematodes with water according to the instructions.
3. Apply evenly across the lawn using a nematode watering can or nematode applicator.
4. Water again after application.
5. Keep the lawn moist for at least 7 days.

Storage and shelf life

This product contains live nematodes and should be stored in the refrigerator on arrival. Nematodes typically have a shelf life of around two weeks from dispatch and should be used before the expiry date. Due to the perishable nature of live nematodes, this product is non-returnable.

Frequently Asked Questions

What area does this pack treat?

This pack treats lawns up to 500 square metres, making it suitable for larger gardens or wider lawn areas.

When is the best time to apply leatherjacket nematodes?

The most effective time is late summer to early autumn when crane fly eggs have hatched and the young larvae are feeding near the soil surface.

Are leatherjacket nematodes safe to use?

This is a biological lawn treatment and can be used on lawns accessed by pets, children and wildlife when used as directed.

Please note Nematodes are live material and cannot be returned. They will usually have an expiry date of around 2 weeks. The effectiveness can sometimes vary due to external factors.

Nematode applicators and watering cans are available