100 sqm Sciarid Fly (Fungus Gnat) Nematodes-Sciarid

100 sqm Sciarid Fly (Fungus Gnat) Nematodes

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Save your plants from Sciarid fly/Fungus gnats and larvae damage with our parasitic nematodes Steinernema feltiae

The adult sciarid flies live on and around the compost surface of pots, more commonly indoors rather than outside. The flies themselves are an unsightly nuisance but most of the damage is caused actually by their young.

The small white larvae live in the compost and feed on the tender roots of plants and cuttings.

Nematodes are more effective if the sciarid population is high.  The nematodes are watered on, and attack the sciarid larvae underground.  Parasitic nematodes seek out suitable hosts by swimming in the thin film of water on soil particles, locating hosts by detecting carbon dioxide and other waste products. Once they find a host, they enter the body cavity through the mouth, anus or spiracles, and release bacteria (Xenorhabdus). The bacteria kills the host within hours, and the nematodes grow and reproduce within the 'broth', which they produce. The next generation of infective juveniles leaves the dead host, and moves in search of fresh hosts. Infected hosts become brown and flaccid, but once dead can be difficult to find in soil. 

How much do I need
How to use

The pack size is 100 square metres

Use only when the pest is present and the growing material is above 12°C

  1. Dissolve the entire contents of the pack in a clean bucket containing 5 litres of water to create a stock solution. 
  2. Stir vigorously and immediately take 0.5 litre of the stock solution place in a 5 litre watering can fitted with a very coarse rose and
  3. Fill with water. 
  4. Apply the solution to a tenth of the affected area. 
  5. Repeat until whole area is treated.
  6. Water the treated area after application.      

Further information


The compost should be moist and above 12°C.  Use all of each pack, if you have less than 100 sqm to treat then just make the solution stronger.  Keep packs in the fridge before their use and up until their use by date.  The compost must be kept moist before and for at least 2 weeks after application.

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