Control fungus gnats biologically – with nematodes against fungus gnat larvae

Fungus gnats are among the most common pests in houseplants, herbs and seed compost. The small black flies are a nuisance, but the actual damage is caused by their larvae in the soil. They feed on fine roots and can considerably weaken young plants in particular.

With SF nematodes (Steinernema feltiae), fungus gnat larvae can be controlled in a targeted, sustainable and completely biological way. These beneficial organisms actively seek out the larvae in the soil and stop the infestation right at its source. Application is suitable for houseplants, herbs, greenhouses and seedlings and can take place all year round at soil temperatures of 8 °C and above.

Our product tip against fungus gnats: nemaplus®

nemaplus® contains live SF nematodes (Steinernema feltiae) that specifically target fungus gnat larvae. Application is simply via the watering can and is harmless to people, pets and plants.

€24.45*

Prices incl. VAT plus shipping costs

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Package size

1 Mio. / 10 Pflanzen

3 Mio. / 30 Pflanzen

5 Mio. / 10 m²

10 Mio. / 20 m²

25 Mio. / 50 m²

50 Mio. / 100 m²

Kompakt - 2 x 5 Mio.

Product number: 1302050

Your benefits at a glance

Biological action against the larvae in the soil
Simply mix with water and pour on
No side effects or residues
Suitable for houseplants, herbs, young plants and greenhouses
Safe for children, pets and beneficial insects
Effective from a soil temperature of 8 °C

Animation von Nematoden in einem Wassertropfen

nemaplus Nematoden-Pulver gegen Trauermücken

How do nematodes work against fungus gnats?

SF nematodes (Steinernema feltiae) are microscopic roundworms that occur naturally in the soil. Once applied with the irrigation water, they move actively through the substrate and search specifically for fungus gnat larvae.

As soon as they find a larva, they enter it and end its development within a few days. The nematodes then multiply inside the larva and go on to seek out further pests. This reduces the infestation sustainably and interrupts the life cycle of the fungus gnats.

As only the larvae are attacked, the number of adult fungus gnats decreases noticeably over time.

Applying nematodes against fungus gnats

Stir the nematodes into water according to the package instructions.
Pour the solution evenly onto the infested soil.
Keep the substrate evenly moist for the following 14 days.
For best results we recommend a second treatment after about 14 days.

Tip: As adult fungus gnats can continue to lay eggs during treatment, a repeat application ensures particularly reliable control.

Where do fungus gnats come from?

Fungus gnats often get into the house via new houseplants or potting soil. Moist soil in particular offers ideal conditions for laying eggs. One female can lay up to 200 eggs in the substrate. New fungus gnats hatch after just a few weeks and the infestation grows quickly.

While the adult black flies are mainly a nuisance, the larvae cause the actual damage. They feed on organic material and fine plant roots. Seedlings, cuttings and young plants are particularly sensitive to a heavy infestation.

Three reasons for nematodes from e-nema:

No residues or side effects

Good service and expert advice

Controlled quality