Grub Killer Beneficial Nematodes

Grub Killer Beneficial Nematodes Latin: Heterohabditis bacteriophora

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White grubs are the larval stage of the June beetle. Grubs are cream colour and about 1.5 cm (0.6 inch) in length, have distinctive legs, and are found in the root systems of plants and lawns.

June beetles have a 3-year life cycle. Adults overwinter in the soil and emerge to lay eggs in late May to early June. After eggs are laid, white grubs are present and begin feeding on grass roots. They then lay dormant deep in the soil before moving to the surface in the spring and continue to feed. In the fall, they again go deep into the soil for the winter and again return to the surface the following spring. At that time, the grubs feed for only a few weeks before pupating and changing to beetles. The beetles, however, remain inactive in the soil until the next spring before taking flight. The life cycle is then complete and a new generation is started.  The second year grub stage is the most damaging due to the size and appetite of the grub.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

Nematodes (Heterorhabditis bacteriophora) seek out grubs and attack the pest by entering natural body openings.  Once inside, they release bacteria that stop the pest from feeding, quickly killing the pest.  The nematodes reproduce inside the dead pest and release a new generation of nematodes, which disperse and search for further prey.

Tips for successful results

  • Apply in spring once the soil has warmed. A second application may be needed in late summer to early fall.
  • Check soil temperature for your area. Ideal temperature at application time is 12ºC (54ºF) or warmer.
  • Area to be treated must be moist prior to application. After a heavy rain is best. Area must be kept moist for at least two weeks after application.
  • Avoid applying nematodes in sunny conditions. Apply in evening or when overcast.
  • Use entire package at once and immediately after mixing. The solution does not store.
  • If using a sprayer make sure it has been cleaned and rinsed well. Remove screen from the sprayer. Use only sprayers that have not had pesticides/herbicides used in them; residue can be harmful to nematodes.
  • Apply prior to expiry date

Directions for applying:

Mix contents of package in at least 4 liters of water then apply mixture with a hose end sprayer to affected area or add ½ liter of the mixture to an 8 liter watering can and fill with water to apply to area.

Apply to moist lawns when the soil temperature is above 12ºC (54ºF) and water them in well. The nematodes need to be watered in well so that they reach the root zone where the grubs live. Make sure the lawn does not dry out after applying nematodes. Keep the lawn well watered for at least two weeks.

*Nematodes are typically available in the Spring when the soil temperatures rise to 15 degrees celsious and again in the fall. As they are a live product please be aware of expiry date, they must be kept cold until application.
**This product can be shipped throughout Atlantic Canada - it is a live product so will travel with cold packs. Please call for availability and shipping rates.

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