---
product_id: 49523584
title: "Nemasys leatherjacket killer (100sqm pack)"
brand: "nemasys"
price: "£27.79"
currency: GBP
in_stock: true
reviews_count: 8
category: "Nemasys"
url: https://www.desertcart.co.uk/products/49523584-nemasys-leatherjacket-killer-100sqm-pack
store_origin: GB
region: United Kingdom
---

# 100 sqm coverage Water-mix application 2-week fridge shelf life Nemasys leatherjacket killer (100sqm pack)

**Brand:** nemasys
**Price:** £27.79
**Availability:** ✅ In Stock

## Summary

> 🌿 Defend your turf naturally — because your lawn deserves VIP treatment!

## Quick Answers

- **What is this?** Nemasys leatherjacket killer (100sqm pack) by nemasys
- **How much does it cost?** £27.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/49523584-nemasys-leatherjacket-killer-100sqm-pack)

## Best For

- nemasys enthusiasts

## Why This Product

- Trusted nemasys brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Application:** Simply mix with water and use a watering can or EasyNem Applicator for even, hassle-free lawn treatment.
- • **Optimized Lawn Revival:** Stops root-eating larvae, preventing yellow patches and bare spots, so your lawn stays lush and Instagram-ready.
- • **Precision Seasonal Timing:** Apply in Autumn (Sept-Nov) for max impact when larvae are most vulnerable, or spring at double strength.
- • **Natural Pest Control Power:** Harness millions of Steinernema feltiae nematodes to target leatherjackets biologically and safely.
- • **Safe for Family & Wildlife:** 100% natural, non-toxic formula safe for children, pets, and beneficial garden wildlife—use your lawn immediately after treatment.

## Overview

Nemasys Leatherjacket Killer is a natural, nematode-based biological treatment designed to control leatherjacket larvae over 100 sqm of lawn. Best applied in autumn when soil temperatures exceed 12°C, it uses Steinernema feltiae nematodes to infect and kill root-damaging larvae safely and effectively. The product is easy to apply by mixing with water and is safe for children, pets, and wildlife, with immediate lawn usability post-application. Its perishable nature requires refrigeration and use within two weeks, ensuring fresh, potent nematodes for optimal pest control.

## Description

Product description Nemasys Leatherjacket Killer should be applied when the soil temperature is above 12oC (54oF) and the leatherjackets are at the correct stage in their life cycle. This will be late August till the end of October. An easy way to judge the correct time is to apply two weeks after a large number of crane fly are seen. After this application time the leatherjackets will begin to mature, moving towards pupation in the spring and the nematodes will find it difficult to penetrate and kill the pest. Leatherjackets are the larval stage of the crane fly or daddy long legs. Control leatherjackets naturally by treating with Nemasys Leatherjacket Killer in April and or September - the ideal time to treat. Crane 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 :- Grass growth slows and yellow patches appear. Grass easily pulled up with little or no root growth. Birds, particularly starlings, will pull at the lawn in search of the leatherjackets. 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 2.5cm / 1" long, greyish black in colour, legless and with no distinct head. Nemasys® Leatherjacket Killer should be applied to the lawn in April and/or September. The lawn must be moist (we recommend pre - watering) and apply on a dull day or in the evening. After application you MUST wash in the nematodes by watering heavily by hose or by sprinkler. To apply, simply mix the nematodes with water. Apply with watering can or hose end feeder. Once applied the nematodes will seek out the leatherjacket larvae. On contact they enter the larvae and destroy it. Nemasys® Leatherjacket Killer is a living, perishable product. Once you receive it, it will keep for up to 2 weeks in the FRIDGE and you must use before the expiry date. Directions Divide the pack into 10 equal portions.Add 1 portion i.e. a tenth of the pack to feeder bowl.Then fill the bowl with water before attaching the hose.Taking care to keep the feeder in an upright position apply evenly to 50 sqm for 8 minutes using a side-to-side motion to keep the nematodes well mixed.

Review: Worked for me. - Our house is built on a site that has red sandstone not far below the surface. In fact digging the founds was quite problematic and required heavy machinery. As a result, we do not have much depth of soil and in some areas of our front lawn, it’s only a few inches. This has the dual effect of making these areas vulnerable to hot dry spells and, for whatever reason, attractive to crane flies to lay their eggs. Their larvae then eat the grass roots. In the past this has resulted in large bare patches. I tried Nemasys last year 2022 and saw an immediate improvement with our lawn looking better than it has for years. Then we had the early summer of 2023 which resulted in my grass being burnt and dying back. I applied Nemasys again a few weeks ago and have seen major improvements since with a green recovery which suggests that part of my problem continued to be leatherjacket infestation rather than just being burnt! The product requires taking a little care to mix it in the correct proportions and then use a watering can with a coarse rose. It also has a short shelf life so buy it when you intend to use it, otherwise being a biological product, it will die on the shelf!. It goes quite a long way. My front lawn is around 40/50sq metres and rear about 80/90sq metres and one pack of Nemasys easily dealt with the front lawn and left me with enough to apply it to troublesome patches on the rear lawn. I am not green fingered by any means but find this product has worked very well for me and can recommend it.
Review: Easy to apply - Well I've used these and there are still signs of the little critters ..so not sure if you have to reapply every year. Initially it cured the problem. Easy to apply. Recommended.

## Features

- Control leatherjackets naturally by treating with Nemasys Leatherjacket Killer containing millions of natural nematodes.
- It is easy to apply - mix with water and apply the nematodes (Steinernema Feltiae) to the infected lawn with a watering can or EasyNem Applicator (see listing B09HKFCL25. Nemasys Leatherjacket Killer is a natural product and is totally safe for children, pets and wildlife and the lawn can be used immediately after application.
- It is best to treat in the Autumn i.e. Sept/Oct/Nov as this is when the leatherjackets are newly hatched, the soil is warm (needs a daytime soil temp of 10c) and are at the most susceptible to the nematodes. You can treat at other times of the year i.e. in the spring and summer, but you must treat at DOUBLE STRENGTH as the mature leatherjackets are much harder to kill.
- Nemasys Leatherjacket Killer is a perishable product, which will keep for up to 2 weeks in the fridge, so please order when you are ready to apply.
- This pack of Nemasys Leatherjacket Killer treats 100 sqm in the Autumn or 50 sqm when applied at double strength. Full instructions included.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000VPCUPW |
| Best Sellers Rank | 4,699 in Garden ( See Top 100 in Garden ) 66 in Indoor Multi-Insect Control 270 in Outdoor Insect Control |
| Brand | Nemasys |
| Brand Name | Nemasys |
| Customer Reviews | 4.2 out of 5 stars 4,923 Reviews |
| Item Form | Powder |
| Item form | Powder |
| Manufacturer | Becker Underwood |
| Specification Met | USDA |
| Specification met | USDA |
| Target Species | Nematodes |
| Target species | Nematodes |
| Unit Count | 1 count |
| Unit count | 1 count |

## Product Details

- **Brand:** Nemasys
- **Item form:** Powder
- **Specification met:** USDA
- **Target species:** Nematodes
- **Unit count:** 1 count

## Images

![Nemasys leatherjacket killer (100sqm pack) - Image 1](https://m.media-amazon.com/images/I/71YtFn09xbL.jpg)
![Nemasys leatherjacket killer (100sqm pack) - Image 2](https://m.media-amazon.com/images/I/61LXY5OekkL.jpg)
![Nemasys leatherjacket killer (100sqm pack) - Image 3](https://m.media-amazon.com/images/I/81PPNCToMLL.jpg)
![Nemasys leatherjacket killer (100sqm pack) - Image 4](https://m.media-amazon.com/images/I/91ijvJXk7SL.jpg)
![Nemasys leatherjacket killer (100sqm pack) - Image 5](https://m.media-amazon.com/images/I/51Ac30A9+FL.jpg)

## Questions & Answers

**Q: I have just discovered that leatherjackets are responsible for my poor lawn. Will this work in April?**
A: Nematodes will control leatherjackets provided the conditions are right. The soil needs to be warm and wet and the leatherjackets need to be at the right stage of their life cycle. The best time of the year to treat is when the young are first emerging in the autumn. However the nematodes can also be used in the spring once the soil has warmed up. A good rule of thumb is to treat as soon as you have grass growing, but don't leave it so late that the leatherjackets have started to pupate ready to fly off and breed. April can be just about right.

**Q: My lawn has a mix of eggs, flies and leatherjackets. Will product work if applied now(start of August)?**
A: September/October is better, and this does the job well. Don't order to early as it only has a fridge life of about 3 weeks. there is another similar product for other infestations, I used both.

**Q: Can I treat in march**
A: April and sept best. Apply after lots of daddy long legs flying about. Best above 12*c

**Q: How long does it take for the treatment to work?**
A: No difinitive answer, as they have to hatch and deal with the leather jackets. Best to apply in September after the crane fly have emerged to lay their eggs. Repeat in the spring when warm enough.  Our lawn is beautiful now after above treatment.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked for me.
*by N***R on 5 October 2023*

Our house is built on a site that has red sandstone not far below the surface. In fact digging the founds was quite problematic and required heavy machinery. As a result, we do not have much depth of soil and in some areas of our front lawn, it’s only a few inches. This has the dual effect of making these areas vulnerable to hot dry spells and, for whatever reason, attractive to crane flies to lay their eggs. Their larvae then eat the grass roots. In the past this has resulted in large bare patches. I tried Nemasys last year 2022 and saw an immediate improvement with our lawn looking better than it has for years. Then we had the early summer of 2023 which resulted in my grass being burnt and dying back. I applied Nemasys again a few weeks ago and have seen major improvements since with a green recovery which suggests that part of my problem continued to be leatherjacket infestation rather than just being burnt! The product requires taking a little care to mix it in the correct proportions and then use a watering can with a coarse rose. It also has a short shelf life so buy it when you intend to use it, otherwise being a biological product, it will die on the shelf!. It goes quite a long way. My front lawn is around 40/50sq metres and rear about 80/90sq metres and one pack of Nemasys easily dealt with the front lawn and left me with enough to apply it to troublesome patches on the rear lawn. I am not green fingered by any means but find this product has worked very well for me and can recommend it.

### ⭐⭐⭐⭐ Easy to apply
*by N***7 on 1 April 2025*

Well I've used these and there are still signs of the little critters ..so not sure if you have to reapply every year. Initially it cured the problem. Easy to apply. Recommended.

### ⭐⭐⭐⭐⭐ Great product.
*by J***S on 9 May 2026*

We’ve bought this product several times now, it’s been as effective as possible in helping to control the leather jackets in our lawn. Easy to apply with simple instructions. Make sure you keep refrigerated if you don’t use immediately.

## Frequently Bought Together

- Nemasys leatherjacket killer (100sqm pack)
- Nemasys Leatherjacket Killer nematode treatment (200 sqm)
- Nemasys Leatherjacket Killer nematode treatment (100 sqm)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-24*