Applying Beneficial Nematodes in the Garden

Beneficial nematodes are living, microscopic roundworms that are found naturally in soils throughout the world. They are an effective method for managing lawn and soil pests like grubs, fleas, and sod webworms anywhere in your landscape during spring, summer or fall.

HOW NEMATODES MANAGE PESTS

Nematodes are parasites that move through moist soil to locate a pest host. Once they find a pest, they penetrate the body and release a toxic bacterium which kills the pest, usually within 24 to 48 hours. Once the pest dies, the nematodes move out into the soil and will continue to manage the pests.

HOW TO APPLY BENEFICIAL NEMATODES

  1. Choose the correct nematodes:

Be sure you identify the correct pest problem. This will help you match the nematode species to your particular pest to get the most effective management.

  • For grubs, thrips pupae, and corn root worms look for Heterorhabditisbacteriophora. This nematode cruises lower through the soil.
  • For flea larvae, coddling moth pupae, leafminer larvae and pupae, sod webworms and cutwormslook for Steinernemacarpocapsae. This nematode will manage pests near the surface of the soil.
  • For fungus gnats look for Steinernemafeltiae.
  1. Store properly: Keep nematodes cool in your refrigerator until you are ready to apply them, and use as soon as possible.
  1. Timing application: Apply nematodes early in the morning or at dusk, since they are sensitive to light and heat. Apply when temperatures are above 60°F.
  1. Keep soil moist: Water before applying, and lightly water again after applying the nematodes. Soil should be moist, but not soggy. Nematodes need moisture to survive and move through the soil.
  1. Applying nematodes: Mix nematodes with cool, distilled water following the package instructions, and allow the mixture to sit for 5 minutes. Apply using a watering can, hose end sprayer or pump sprayer or irrigation system.
  1. Monitor pests: A repeat application may be necessary after 2 weeks if the pest problem persists.

For more information on managing pest problems with less-toxic solutions,

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