Steinernema feltiae Beneficial Nematodes for Fungus Gnat Control in soil, targeting root aphids, thrips pupae, and more.
Steinernema feltiae beneficial nematodes package for fungus gnat control showing powder content spilling from bag
Packaging of Fungus Gnat Exterminator featuring Steinernema feltiae nematodes for soil pest control and safety information.
Chart showing Steinernema feltiae nematodes targeting fungus gnats, thrips pupae, root aphids, and grubs for biological pest control.

Fungus Gnat Exterminators

$58.00
While uncommon, order processing can take up to 7 days depending on hatching rates and life stages.
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Fungus Gnat Exterminators

For When You Want the Soil to Handle It

If fungus gnats, thrips pupae, or root aphids are crashing the party below the surface, Steinernema feltiae is how you politely kick them out. These microscopic roundworms hunt through the soil, slip inside pest larvae, and release symbiotic bacteria that take them out from the inside. It’s not pretty—but it works.

Once they’ve handled one host, they reproduce and go looking for more. Give them a bit of moisture and a manageable temperature range, and they’ll keep working long after the first application.

Best For:

  • Fungus gnats

  • Thrips (pupal stage)

  • Root aphids

  • Scarab grubs, weevil larvae, flea larvae, and dozens of other soil-dwelling pests

Why Choose the Easy-Release Powder?

  • Fast action. Infective juveniles start working within days.

  • Sustained control. They reproduce underground for ongoing suppression.

  • Cool-weather champs. Still effective at soil temps as low as 46°F.

  • Easy to mix. Quick-dissolving formula makes even application simple.

How to Use

  1. Water the soil before applying—moisture helps nematodes move.

  2. Mix powder into water according to your coverage needs.

  3. Apply with a watering can, hose-end sprayer, or backpack sprayer.

  4. Keep soil lightly moist for 2 weeks after application.

  5. Avoid applying in full sun or extreme heat.

How Many You Need

  • Preventative / Light Infestation: 5 million per 300 sq. ft.

  • Moderate to Heavy Infestation: 5 million per 50 sq. ft.

Environmental Sweet Spot

  • Soil temps: 46–86°F

  • Moisture: Essential—don’t let the soil dry out

  • Not fans of soggy or flooded conditions (they drown)

  • UV-sensitive: Apply in the early morning, evening, or on cloudy days

Safe for... Everything You Want to Keep Alive

Totally harmless to people, pets, plants, and beneficial insects.
They only go after pests—no collateral damage.

Storage & Shelf Life

  • Store refrigerated at 35–50°F (not frozen)

  • Use within 30 days

  • Once mixed with water: Use within 6 hours

Pro Tips

  • Reapply weekly to monthly if pest pressure is high

  • Combine with above-ground predators for full-spectrum control

  • Compatible with organic and regenerative systems

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