Nematode application procedure

General information

Nematodes are tiny worms, approximately 0.3 mm long, that kill white grubs. These parasites are introduced into the soil though water, which facilitates their migration to the white grubs. Once they have reached their target, they secrete bacteria that are lethal to white grubs. The nematodes then feed on the dead white grub, reproduce and move on looking for another victim.

Nematodes remain active as long as there are white grubs in the soil, and die only when cold temperatures return.

Nematode treatments do not pose any hazard to humans, animals and plants. Treatments are more efficient when the white grubs are relatively young, i.e. a few weeks after the eggs are laid, from early August to late September.

Carrying the nematodes

  • Place the nematode container in a cooler with freezer packs to keep the nematodes cool between the garden centre and your home.

Storage

  • Store the nematodes in a cool dark place. Example: the refrigerator.

Preparing your lawn

  • Aerate the soil to facilitate the nematodes' penetration.
  • Rake your lawn to remove any debris.
  • Water your lawn thoroughly 48 hours before the application and keep the soil moist for the next three days.

Application

  • Before the nematodes are introduced, make sure that the soil's temperature is above 12°C. The application of nematodes is therefore not possible during the spring. Its application from the end of August until the end of September yields better results.
  • The application should be done on a cloudy day or in the evening since nematodes are sensitive to the sun's UV radiation.

If you are using a sprayer:

  • Rinse the sprayer if it was previously used to apply fertilizer.
  • Remove the filter inside the sprayer since it could damage the nematodes.
  • Empty the package's entire content into a few litres of water after letting the water rest for a few hours, and mix thoroughly. Follow the instructions for the appropriate amount of water. Let the mixture rest for 5 minutes.
  • Mix the solution and add the required amount of water for the surface area to be treated. The treatment's makers claim that 10 litres of solution will cover 25 m².
  • Shake the container and proceed with the application. Continue agitating the sprayer's reservoir gently but continuously to keep the nematodes from settling at the bottom.
  • Apply the entire solution and thoroughly water the soil.

If you are using a multipurpose sprayer (with a hose):

  • Rinse the sprayer if it was previously used to apply fertilizer.
  • Remove the filter inside the sprayer since it could damage the nematodes.
  • Empty the package's entire content into a few litres of water after letting the water rest for a few hours, and mix thoroughly. Follow the instructions for the appropriate amount of water. Let the mixture rest for 5 minutes.
  • Mix the solution and fill the sprayer's reservoir. You can do the application in more than one step if you prefer.
  • Adjust the sprayer's dilution level as required for the surface area to be covered. In most cases, the flow rate should be at maximum.
  • Shake the sprayer's reservoir gently but continuously to keep the nematodes from settling at the bottom.
  • Apply the entire solution.
  • Thoroughly water the soil after the application.

If you are using a watering can:

  • Empty the package's entire content into a few litres of water after letting the water rest for a few hours, and mix thoroughly. Follow the instructions for the appropriate amount of water. Let the mixture rest for 5 minutes
  • Mix the solution and add the required amount of water for the surface area to be treated. The treatment's makers claim that 10 litres of solution will cover 25 m².
  • Shake the container and proceed with the application. Continue agitating the sprayer's reservoir gently but continuously to keep the nematodes from settling at the bottom.
  • Apply the entire solution and thoroughly water the soil.

After the treatment

  • Thoroughly water you lawn up to a week after the treatment to keep the soil moist. Please contact your borough for lawn watering hours to obtain a watering permit.

Checking for results

  • Before applying the nematodes, identify the highly infested spots using markers such as sticks. Twenty-four to 48 hours after the application, check to see if the white grubs changed colour. If they become reddish or rust-coloured, it means that they have been attacked by the nematodes and that your treatment was efficient!