Special offer

Leatherjacket ASAP and Autumn 100 sqm Offer

(9 customer reviews)


Leatherjacket Nematodes are normally applied once a year in the autumn, but if you have discovered a severe infestation, then you can treat TWICE to get on top of the problem i.e. NOW and again in the Autumn. Order our Leatherjacket Killer ASAP and Autumn 100 sqm Offer and we will send 2 x 100 sqm packs separately – the 1st pack will be sent ASAP (or insert your own date below) followed by another pack sent AUTOMATICALLY in the Autumn i.e. w/c 9th Sept (or email us an alternative date and we will organise it) and save £2.00 the normal combined price. 

Special Offer – Help your lawn recover from a pest attack by applying Root Success Fertiliser – Add Root Success and save £1.50 off the combined price (saving applied at checkout).
N.B. Need a Coarse Rose, NemaCan Watering Can, EasyNem Applicator or Hose-end Feeder  – Add one to your basket and save £1.00 off a Coarse Rose OR save £2.00 off a EasyNem ApplicatorHose-end Feeder or NemaCan when bought with your nematodes (savings applied at the checkout).

Select a future w/c dispatch date or leave today’s date for dispatch ASAP * 

Full Description

Daddy Long LegsCrane flies or daddy long legs lay their eggs in the same area of lawn from which they emerge, so numbers increase rapidly. These eggs hatch in August / Sept and the larvae immediately start to feed on the grass roots. The leatherjackets will feed though the autumn, before overwintering. They start feeding again the following spring and gorge on grass roots before pupating to emerge as adults in August. The symptoms of an attack are that grass growth slows and yellow patches appear PLUS the grass easily pulled up with little or no root growth. One of the biggest indicators of an infestation are birds, particularly starlings, which will pull at the lawn (causing even more damage) in search of the leatherjackets to eat.

LeatherjacketsLeatherjackets – In August, customers report clouds of daddy long legs emerging from lawns in early morning leaving behind the casings sticking up in the lawn. As the daddy long legs emerge, they start to lay their eggs back in infected lawns starting the whole cycle again – the next generation of leatherjackets hatch within 2 weeks. Leatherjackets are up to 2.5cm / 1″ long, greyish black in colour, legless and with no distinct head. We recommend treating with Leatherjacket Nematodes in late autumn when the leatherjackets are newly hatched, close to the surface and the soil is warm and the leatherjackets are the most susceptible to the nematodes. You can treat during the rest of the year, but you need to apply the treatment at double strength.

Control leatherjackets naturally by applying Leatherjacket Nematodes containing millions of nematodes to the infected lawn as soon as the leatherjackets are discovered (and the soil temperature is 10c) or when the leatherjackets are active i.e. in the autumn (Sept / Oct / Nov). Leatherjacket Nematodes are effective at killing leatherjackets, but is harmless to children, wildlife and pets and the lawn may be used immediately after application. Apply as follows :-

  • Apply Leatherjacket Nematodes in September/October/November – This is the ideal time to treat as the soil is warm PLUS the leatherjackets are newly hatched and are the most susceptible to the nematodes, so if you have had leatherjackets in the past or have discovered a leatherjacket infestation or your neighbours are infested and you want to keep them at bay, treat in Sep/Oct/Nov (needs a daytime soil temperature is 12c) . When applying in the autumn, the packs will treat either 100 sqm or 500 sqm. Order for delivery in the Autumn.
  • Apply Leatherjacket Killer when leatherjackets are discovered – Nemasys® Leatherjacket Killer is normally applied in September as this is when the leatherjackets are newly hatched and most susceptible to the nematodes, but if you have discover leatherjackets (not daddy long legs) at any other time of year i.e. in the spring/summer then treat at double strength as the mature leatherjackets are much harder to kill, but you must treat in September as well. When applying in the spring / summer at double strength i.e. Large packs will treat 50 sqm / Economy packs will treat 250 sqm. N.B. Available all year round.

How to apply?Leatherjacket Killer is easy to use. Simply mix the harmless powder with water & apply to the lawn using a watering can fitted with a Rose (we recommend the Haws Rose no.14) or use a NemaCan Watering Can or use a Easynem Applicator / Hoseend Feeder for larger areas. Leatherjacket Nematodes should be applied to a moist lawn (we recommend pre – watering) on a dull day or in the evening. After application you MUST wash the nematodes into the lawn by watering heavily with a hose or a sprinkler. Once applied the nematodes will seek out the leatherjacket larvae and on contact they enter the larvae and destroy it. Having destroyed the leatherjacket ,the nematodes multiply and are released back into the soil to hunt down more leatherjackets.

How is it sent?Leatherjacket Nematodes are a perishable, living product, so it is sent out fresh by Royal Mail 1st class post. Being a perishable, living product, it must be used before the expiry date (which is marked on the inside of the pack and will be at least 2 weeks) and it must be stored in the fridge until it is needed. Once opened, the contents do not keep, so it must be used in one day – do NOT store the made up solution or powder. 1 or 2 packs will go through your letterbox and should be popped in the fridge as soon as possible – they are fine on the doormat while you are at work.

N.B. Need a Coarse Rose, NemaCan Watering Can, EasyNem Applicator or Hose-end Feeder  – Add one to your basket and save £1.00 off a Coarse Rose OR save £2.00 off a EasyNem ApplicatorHose-end Feeder or NemaCan when bought with your nematodes (savings applied at the checkout).


  1. Angela

    Had leather jackets 2year ago and got someone in to treat cost a lot of money so I read up about them and thought I would try it my self so please with the results that I will just keep doing it my self .

  2. Anonymous

    Good service and product of nemesis for leatherjackets seems to do the job. Have ordered more for the autumn.

  3. GRAHAM HOWELLS (verified owner)

    Good product for leather jacket eradication which is delivered at the exact time for application.

  4. Richard Denton (verified owner)

    Great service from a very professional and knowledgeable company. Everything I have bought nematodes, spring and autumn organic fertiliser, root success mycorrhizal fungi have worked with great success ,cannot recommend Green Gardener more highly.

  5. Trevor Marshall (verified owner)

    Ordered Nematodes for garden due to crane fly infestation. Excellent advice and quick delivery. After 2 weeks the hungry little tides are now eating the lava and the problem is quickly disappearing. I’ll be treating again in the early spring and won’t hesitate to buy from Green Gardener again.

  6. Graham Hewitt (verified owner)

    I had a big problem with crane flies in 2021. The result was the lawn had many yellow patches where the grass roots had been eaten. I ordered nematodes from Green Gardener. The delivery was prompt and customer service excellent. I did the same in 2022 and the lawn greatly improved. This year the lawn is almost back to normal but I did another application, just in case. Thank you Green Gardener for the great advice, great product and great service.

  7. lynne charnley (verified owner)

    Always receive a great service. from the customer service team to the expert gardeners when I have to ask their advice, especially regarding nematodes/nemasys for leatherjackets. This year in our village there has been an infestation of these flying pests so I’ve doubled the dose and will add more in April so that those empty spaces don’t appear in my lawn.

  8. Anonymous (verified owner)

    Had a bad infestation of leatherjackets. Purchased a two-stage treatment. The first delivered immediately and the second was delivered at the correct time later in the season by the Green Gardener. Good service.

  9. Andrew Chalmers (verified owner)

    Bought Nematodes to hopefully reduce the number of Leatherjackets, a very prompt delivery and a great product that’s definitely doing the right thing as we have hardly seen any of the crane fly larvae.

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