Product code: NEMASYSJ
Nemasys JNemasys J
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Nemasys J - Biological Leatherjacket Control

Nemasys J is a non-chemical product that will naturally control leatherjackets in grass and turf. The presence of leather jackets is usually seen by rough scruffy turf being pulled up by birds & animals as they search for fresh grubs.

Available to order from 15th April 2019

£80.00 + VAT £96.00 inc VAT

In stock

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Damaging leatherjacket larvae are laid as eggs in lawns during August by the Crane Fly. The withdrawal of chemical insecticides means Nemasys J is now the best and only method to naturally control the leatherjackets by using the beneficial nematodes in Nemaysy J.

The Nemasys J nematodes enter the larvae and stops them feeding within three days of infection. The larvae then die within 10-14 days. 

The nematodes complete their life-cycle within the larvae, then enter the soil seeking more hosts, and so the pest control continues naturally.

Contains:               250 million parasitic nematodes
Coverage:              Pack treats approx. 500m2

Key points:

  • Contains the insect parasitic nematode Heterohabditis megidis
  • Larvae die within 10-14 days
  • Will not damage turf and is harmless to pets and wildlife
  • Harmful leather jackets are most active August to October and adult beetles July to August


  • Apply when soil temperatures are at least 100c  from Aug. to Sept. Check your soil temperature with a Soil Probe Thermometer.
  • Nemasys arrives in a sealed cool box - can be refrigerated for up to four weeks
  • Remove fine mesh/ gauze's from spray equipment - especially in-line lance filters when applying
  • Add the nematodes to a bucket of water and mix thoroughly - do not allow solution to sit longer than 1 hour
  • Soil must be regularly watered to ensure that it stays damp for the nematodes to remain active - do not apply during drought
  • Repeat treatment may be required

Application rate

 Nemasys J


50L of water


  • Good spray coverage is essential for optimum pest control
  • Apply a high volume spray to the turf to ensure penetration into the soil
  • Make sure all in-line and nozzle filters are removed

Product Usage Calendar

*KEY - Green = suggested period of use