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Steinernema feltiae - against Fungus Gnats & Thrips main product photo on white background.
Steinernema feltiae - against Fungus Gnats & Thrips on white background.
Steinernema feltiae - against Fungus Gnats & Thrips on white background.
Steinernema feltiae - against Fungus Gnats & Thrips on white background.
Steinernema feltiae - against Fungus Gnats & Thrips on white background.

Steinernema feltiae - against Fungus Gnats & Thrips

Steinernema feltiae is applied below the surface, where fungus gnat larvae develop. Use it for fungus gnat larvae and other target stages living in moist substrate.

Read full guide to Steinernema feltiae - against Fungus Gnats & Thrips
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Steinernema feltiae - against Fungus Gnats & Thrips: Best-use notes for plant care

Steinernema feltiae is a biological substrate application for larvae living in moist potting mix. Mixed with water and applied as a drench, the nematodes move through moist potting mix and move through moist potting mix and are used for target soil-dwelling stages.

Steinernema feltiae – Nematodes for Fungus Gnat Larvae and Soil-Dwelling Thrips Stages

If fungus gnats keep coming back, the real issue is usually below the surface. These beneficial nematodes are meant for that zone. They are applied with water and work in damp substrate, where they help reduce larvae before they emerge as another wave of adults.

Target pests

  • Fungus gnat larvae: the main use case in houseplants.
  • Soil-dwelling thrips stages: useful in situations where part of the thrips life cycle drops into the substrate.
  • Recurrence control: especially helpful when adult insects keep returning after traps alone.

Setup and use

  • Mix the powder with lukewarm water according to the selected pack size.
  • Drench the substrate not the leaves.
  • Apply in lower light or in the evening.
  • Keep the substrate evenly moist for about 14 days afterwards.

Pack sizes

  • 2.5 million: about 5 plants
  • 5 million: about 10 plants
  • 10 million: about 20 plants
  • 25 million: about 50 plants
  • 50 million: about 100 plants

Care and limits

  • Use as soon as possible after arrival.
  • If needed, keep unopened packs refrigerated at 4–8 °C for up to 7 days.
  • Once mixed with water, use the solution immediately.

Practical use

Use it early, while pest pressure is still manageable. Consistent placement and timing matters more than changing products frequently.

Combine with basic hygiene: remove heavily damaged leaves, isolate affected plants, and check neighbouring pots so you treat the full area.

Practical note

  • Follow the product instructions for placement and temperature range.
  • Avoid spraying oils or soaps on release days unless the supplier confirms compatibility.
  • Repeat checks weekly until new damage stops.
Steinernema feltiae - against Fungus Gnats & Thrips main product photo on white background.
Steinernema feltiae - against Fungus Gnats & Thrips Sale price€17,50

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