Nematodes siarides

Nematodes parasites for many insect pests


Entomopathogenic nematodes of the species Steinernema feltia are a biological control agents used to control fungus gnats,shoreflies and thrips.This agent is ideal to quickly controlling moderate pest infestations.

Entomopathogenic nematodes are distributed in the juvenile stage (infectious larvae). There are 0,4 to 1,5 mm long and can be observed with a 20 X magnifying glass. Once in the soil, they penetrate in the insect pest by its natural openings (mouth, respiratory orifices and anus). The Nematodes feed on the tissues and release symbiotic bacteria that are present in their intestines. These bacteria kill the host after 24 to 48 hours.

The majority of sciarid species feed on decomposing algae and on organic matter. On the other hand, some species of the Bradysia genus prefer to feed on living plant tissues or mushroom tissues. They cause significant growth problems and promote the spread of fungal diseases such as Pythium, Fusarium and Rhizoctonia.


For the commercial market only.

Targeted crops

  • Market garden crops (cucumbers, tomatoes, peppers, lettuce, etc.)
  • Ornamental crops
  • Mushrooms
  • Potted plants
  • Tree Nursery
  • Cannabis

Targeted pests

  • Fungus gnats (soil application)
  • Shore flies (soil application)
  • Thrips (leaf application)
  • Leafminer (leaf application)

Life cycle

  • Optimum conditions are a temperature between 15 to 20°C and moist soil.
  • Become inactive below 15°C and above 30°C.
  • The ideal pH is between 4 to 8.
  • After their application, juvenile nematodes look for hosts to infect.
  • They enter the target insects through their natural orifices (mouth, anus and spiracles).
  • They then release a bacterium that kills the host within a few days.
  • Nematodes cause host death within days.



  • 107043 - Canadian nematodes Guardian Sentry - 10 million Steinernema Feltia (20 m2)
  • 107048 - Canadian nematodes Guardian Sentry - 50 million Steinernema Feltia (50 m2)

Introduction rate

Treatment Quantity Surface Frequency Duration
Light curatif 250 000 to 500 000 m2 as needed 1 to 2 introduction
Strong curatif 250 000 to 500 000 m2 every 7 days/td> 2 to 3 introductions

Additional information

  1.   - Using Beneficial Nematodes to Manage Pests in Greenhouses - UMass Extension Agriculture & Commercial Horticulture Program
  2.   - Nematodes for Lawn Grubs - NIC’s How to Apply - Revised
  3.   - Life Cycle of Entomopathogenic Nematodes by Maxwell Helmberger
  4.   - Entomopathogenic nematodes - University of Florida
  5.   - Nematodes - Biological Control - Cornell University
  6.   - Entomopathogenic Nematodes for Control of Insect Pests Above and Below Ground with Comments on Commercial Production - The journal of Nematology (2012)

Targeted pest

Targeted production

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