Leatherjacket Lawn Treatment

Leatherjackets Lawn Treatment: Effective Management Strategies

Leatherjackets Lawn Treatment

Maintaining a healthy lawn is integral to the overall aesthetic of your garden. Pests, particularly Leatherjackets, pose a significant threat to the greenery by attacking the roots. It’s crucial to identify and address these pests before they cause extensive damage. Leatherjackets, or Daddy Long Legs larvae, are a common but often inconspicuous pest in gardens. While a robust lawn can withstand the odd Leatherjacket, a multitude of them can wreak havoc.

Understanding the lifecycle of these pests is key to managing them. Leatherjackets stem from the eggs laid by Crane Flies typically towards the end of summer and throughout autumn. The larvae tend to emerge and commence their destructive behaviour by spring. Monitoring for signs of infestation annually is essential, especially as milder winters may lead to earlier egg hatching. Being alert and informed about these pests is the best way to keep your lawn in prime condition.


Key Takeaways

  • Identifying pests early is critical for lawn health.
  • Knowledge of pest lifecycles aids in timely intervention.
  • Regular monitoring can prevent significant lawn damage.


When we encounter leatherjackets in gardens, we’re observing the larval stage of crane flies—often mistakenly referred to as daddy longlegs. These larvae typically surface from July to September, leading to a notable presence of adult flies.

Infestations are typically signalled by:

  • Aggregations of adult crane flies over summer
  • Yellowish to greyish-brown patches on lawns, beneath which larvae reside
  • Avian activity, with birds foraging for grubs in the grass

The lifecycle progresses from eggs laid by adult flies to larvae with a greyish brown hue and without legs, which are the actual leatherjackets. Ultimately, they become adult crane flies. Damage to lawns and small plants typically occurs at the larval stage, where they feed on roots, leading plants to wither and die.


Leatherjackets Locating

When assessing lawns, we observe the ground’s responsiveness to the seasons. In summer and autumn, lack of water can lead to drought, while spring brings growth and moist conditions conducive to lawn recovery. It’s best to:

  • Examine the turf: Gently peel back patches to reveal the soil level and root structure.
  • Check for pests: More than 5 per square metre indicates action is needed.
  • Inspect the perimeter: Pests often radiate outwards from the edges.


  • Use plastic sheets or black polythene as a tarpaulin to protect the top layer of soil when not being watered.
  • Regular watering maintains a healthy lawn, especially in warm seasons.


Best Selling Leatherjackets Lawn Treatment

When we treat leatherjackets in the lawn, we recommend several methods that focus on the removal, control, and prevention of infestation. Protection of the turf from damage caused by these grubs is paramount.

  • Physical Removal: By placing a black plastic sheet over affected areas during the night, it encourages leatherjackets to come to the surface. In the morning, remove the sheet slowly to gather and dispose of the pests.
  • Biological Control: Application of nematodes (Steinernema feltiae) offers an organic treatment. These pathogenic nematodes enter the leatherjackets’ bodies, releasing bacteria that are fatal to the grubs. Note that for effective application, the soil conditions require adequate moisture and a temperature no lower than 12°C, which is why autumn is the best time for this treatment.
  • Natural Predators: Birds such as starlings, rooks, crows, magpies, alongside foxes and badgers, play a role in controlling leatherjackets by feeding on them. Welcoming these predators to the lawn could naturally reduce the pest population. The birds will also help aerate the lawn by removing thatch and moss.
  • Preventative Approaches: Monitoring for signs of infestation early on can prevent extensive damage. Remember to pay special attention to the lawn’s edges, which are common spreading points for these pests. Should the conditions be unsuitable for nematodes, considering other safe and organic options such as garlic spray may serve as a deterrent.

Certain practices can inadvertently contribute to the problem. For example, excessive irrigation can create ideal breeding conditions for leatherjackets. Adjusting watering schedules and ensuring proper drainage can thus be effective preventative measures.

It’s equally important to identify when the soil might be too cool for treatments like nematodes to be effective, as leatherjackets can tolerate lower temperatures. Monitoring the soil temperature and scheduling treatments accordingly is essential to achieving control over leatherjacket populations.

Last update on 2024-05-27 / Affiliate links / Images from Amazon Product Advertising API


Leatherjackets Repair

Once pests are controlled, we must address the lawn’s damaged zones. Our approach involves three core stages: scarifying, aerating, and overseeding. Addressing bald patches is straightforward using this regimen.


  • Removes thatch
  • Encourages healthy grass growth
  • Improves water penetration to roots


We create small round holes, facilitating:

  • Enhanced root growth
  • Reduction of soil compaction
  • Better nutrient absorption
  • Efficient gas exchange for roots

For a guide on the best lawn aerators and their benefits, refer to our article on Best Type of Lawn Aerators.


Here’s our process:

  • Apply seed mixtures to thicken lawn grasses
  • Encourage germination in patches
  • Blend new seedlings with existing turf for an even look

Post-repair, regular lawn maintenance resumes. This includes:

MowingEnsuring the proper height for various lawn grasses.
WateringAdequate moisture supports newly planted grass roots.
WeedingRemoval of invaders to prevent competition for resources.
CompostingApplying compost to feed soil and promote healthy plant stems.
TurfingReplacing irreparable areas with fresh turf segments.

For additional guidance:

After repairing, our focus shifts back to nurturing a verdant, vibrant lawn. Remember to clear debris regularly, and when planting small plants or seedlings in flower beds or vegetable plots, we protect the stem bases from damage. With these measures, dying grass transforms into a lush, resilient greenscape.

Frequently Asked Questions

How Can We Identify the Presence of Leatherjackets Within Our Lawn?

To discern leatherjacket presence, look for these signs:

  • Yellow patches on grass.
  • Birds, particularly starlings, pecking at the lawn.
  • Increased activity of badgers and foxes, as they may dig the lawn for larvae.
  • Sponginess underfoot due to the grubs consuming roots.

Which Nematode Species Is Most Effective for Controlling Leatherjackets in Gardens?

Steinernema feltiae nematodes are highly effective:

  • They specifically target leatherjackets.
  • Environmentally safe and non-toxic to other wildlife.
  • Apply through watering cans or hose-end sprayers.

What Is the Optimal Timing for Applying Treatments to Control Leatherjacket Infestations?

Treat leatherjackets during late summer and early autumn:

  • Larvae are smaller and more susceptible.
  • Soil temperature is typically above 12°C, crucial for nematode activity.
  • It prevents extensive root damage before winter.

Are There Any Chemical Solutions Recommended for Eradicating Leatherjackets?

Chemical treatments have been restricted, but these are previously known options:

  • Chlorpyrifos (legislation has limited use due to environmental concerns). Note: Always follow local regulations and label instructions for any chemical usage.

Can Leatherjacket Larvae Cause Significant Damage to Grass, and How Can This Be Managed?

Leatherjacket larvae can cause substantial damage:

  • They feed on grass roots, leading to yellow patches and grass death. Managing damage involves:
  • Encouraging natural predators like birds.
  • Aerating and overseeding the lawn to improve health.
  • Applying nematodes or approved insecticides where permitted.

What Are the Most Efficacious Methods for Removing Leatherjackets from Lawns?

Effective removal methods include:

  • Biological control with nematodes as mentioned above.
  • Encouraging natural predation by birds through creating a bird-friendly environment.
  • Physical removal by hand during lawn repairs if larvae are exposed.

Lawnmower Product Expert, Reviewer and Author at EasyLawnMowing.co.uk | 01284 615144 | info@easylawnmowing.co.uk | Website | + posts

As a seasoned expert in the field of garden power tools, I have dedicated over a decade to working with and reviewing a wide variety of lawn mowers. My extensive experience has allowed me to gain a deep understanding of the benefits and limitations of different types of mowers and garden tools.

Over the years, I have honed my skills in writing informative articles and creating helpful videos for various blogs and publications. This has given me the ability to not only recognise what makes a good lawn mower, but also to help you choose the perfect garden tool for your specific needs and requirements.

With my wealth of knowledge and expertise, I am confident that I can provide you with valuable insights and recommendations when it comes to selecting the right lawn mower for your lawn. So, whether you're looking for a battery cordless, electric, petrol, or robotic mower, you can trust in my expertise to guide you towards the best option for your garden.

6 thoughts on “Leatherjackets Lawn Treatment: Effective Management Strategies”

  1. Good afternoon,
    I was looking for nematodes to treat leather jackets.
    On your website its saying £16.03 oack of 100sqm the it goes to amazon its over £19.
    Could you please answer my question.
    How does one know when buting the pack of nematodes for leatherjackets are kept in the right temperature ad if they are still alive when arrive at peoples homes because so often I’ve read people have applied to their lawn but still have a problem.
    Thank you i will look forward to hearing from you.
    Thank you

    1. Hi Georgie

      Thanks for your comment. I also have a problem with leather jackets this year and have had a lawn care expert over to take a look.

      He has suggested that I treat them with the same Nematode treatment you mention. He said it’s the same formula they would use, so would be cheaper to do it DIY.

      He did say that the conditions and timing need to be just right for it to stand any chance of working and that in his experience it’s 50/50.

      So I don’t believe it is anything to do with the quality of the product, but how and when it is applied.

      I am in the south east of the country and the lawn expert said it is still too dry to apply the nematodes (20th September), so going to hold off for the lawn to be more moist and no dry period forcast following treatment.

      Let me know how you get on.


  2. Hi Thanks for writing this article. We just recently put fresh lawn seed down (approx. 6 months ago) and are in the process of thickening up our lawn. I have seen a few of the Crane’s fly, flying around and I was wondering if they were a “good” or a “bad” bug. Now I know what to look out for if they get out of control.

  3. WOW!!!!!! What a great article!!!!!!!! I think sometimes people forget about the bugs and just focus on cutting their grass and fertilizing it. I know I never really put a lot of thought into bugs lol. I have been trying to pay better attention to my lawn and make it prettier, this is really going to help. But I wonder….. Is there not something you could put down that would be a good preventative?

    1. Glad to hear you enjoyed it! Not really I don’t think you’re allowed to to apply any pesticides that deal with leatherjackets anymore, pretty sure they got banned. To be honest the best way to prevent them from causing damage is to built your lawn as strong and as healthy as you can by taking proper care of it. Just try to keep it in the best condition possible ;-)

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