Agricultural Solutions UK



Nemasys® M

Nemasys® M contains the beneficial nematode, Steinernema feltiae and is effective against the larval stages of sciarid flies (Lycoriella spp.) that infect mushrooms (Agaricus bisporous).


Advantages of using Nemasys® M:

  • Nemasys® M can be used in organic systems or as part of an IPM programme
  • Safe to users and the environment
  • No pest resistance problems
  • Simply applied as a drench to the casing surface

Why Nemasys® M?

Nemasys® M contains millions of beneficial nematodes of the Steinernema feltiae species and is effective on the larvae of sciarid flies (Lycoriella species) which infect mushrooms (Agaricus bisporus).

Beneficial nematodes are naturally-occurring microscopic worm-like organisms. Applied as a drench, they provide an effective, rapid and safe solution to control larvae of the sciarid fly.

Product profile:

Active ingredient(s)Nematodes: species Steinernema feltiae
FormulationPaste (PA)
Pack size150 million or 250 million
CropsMushrooms (Agaricus bisporous)
Pest activitySciarid fly larvae (Lycoriella species)
Rate of application1,000,000 nematodes per m2
Application area treated:
150 million pack
150 m2
Application area treated:
250 million pack
250 m2
Water volumeMinimum 1 litre per m2
Soil temperatureSubstrate should be moist and between 10OC and 30OC during application and for 2 weeks after
Application MethodSoil drench
Application advice
Nemasys M should be applied to the mushroom casing as a drench
To ensure activity over the whole cropping cycle (first and subsequent generations of flies) two applications should be made as detailed on the label
Do not exceed 300 psi/20 bar/2000 kPa pump pressure
Nozzle aperture should be greater than 0.5 mm
Suitable nozzles should produce a course spray at the intended application pressure
Make up the stock solution and mix thoroughly to ensure that the nematodes are well dispersed.
PrecautionsUpon receipt, use immediately or store in a refrigerator at 5OC
Do not use product if past expiry date or incorrectly stored (do not freeze)
Use entire packet at one time, do not store diluted product

How do Nematodes work?

• Nemasys® M should be used to treat larvae of the sciarid fly.

• After application the nematodes attack the larvae by entering natural body openings or by penetrating the pest cuticle directly.

• Once inside, they release bacteria that stop the larvae from feeding and which kill the larvae within a few days.

• The nematodes reproduce inside the dead larvae and release a new generation of nematodes, which disperse to hunt down further larvae.

• When nematodes can no longer find a host pest, they will die back to their original numbers. The more larvae there are, the better the nematodes perform.

Technical Services Hotline: 0845 602 2553

Technical Services Hotline: 0845 602 2553