Steinernema feltiae – Beneficial Nematodes for Fungus Gnats, Thrips & Root Zone Pests
Product details
| Management number | 250625522 | Release Date | 2026/09/17 | List Price | US$28.80 | Model Number | 250625522 | ||
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A soil drench that kills fungus gnats and thrips at the root zone
Some pests spend their most vulnerable stage in the soil, out of reach of anything you spray on the leaves. Steinernema feltiae are naturally occurring soil-dwelling nematodes that hunt those stages directly in the growing media. They are highly effective on fungus gnat larvae, thrips pupae, root maggots, and shore flies, and they are safe for people, pets, pollinators, and other beneficial insects. Mix into water and drench it in.
Live insects ship on Tuesdays only and arrive Wednesday. Orders must be placed 7 days in advance. Anything ordered by 3pm EST Tuesday ships the following Tuesday by UPS overnight shipping.
- Leaf sprays never reach the larvae in the soil
- Adults keep hatching from the untreated root zone
- Chemical drenches leave residue in your media
- Broad products harm beneficial soil life
- Effect stops as soon as you stop treating
- Reactive surface control only
- Drenches straight into the media where the pests develop
- Kills fungus gnat larvae and thrips pupae before they emerge
- Naturally occurring nematodes leave no chemical residue
- Safe for pollinators and other beneficial insects
- Nematodes persist and recycle for two to four weeks
- Attacks the hidden soil stages at the source
Hunts the soil stages Root-zone control
Feltiae moves through the media to find fungus gnat larvae, thrips pupae, root maggots, and shore flies, the stages that leaf sprays cannot touch.
Kills in 48 to 72 hours
Once a nematode enters a host it releases symbiotic bacteria that kill the pest within two to three days, then reproduces inside it.
Persists for weeks 2 to 4 weeks
New nematodes emerge from spent hosts to find fresh prey, so a single drench keeps working for roughly two to four weeks as long as hosts remain.
Safe across the board
These are naturally occurring soil organisms that are harmless to people, pets, pollinators, and other beneficial insects you may be running.
Works in soil and hydro
Feltiae is widely used in greenhouses, nurseries, hydroponics, and houseplants, making it flexible across almost any indoor setup.
Pairs with leaf predators
Run it alongside a canopy predator such as cucumeris for thrips, and you cover both the soil and leaf stages of the pest at once.
Mix into cool, non-chlorinated water at the labeled rate.
Drench the growing media and root zone with a watering can or coarse-nozzle sprayer.
Pre-moisten dry media, apply in low light, and keep moist afterward.
Avoid fine filters, and reapply every few weeks if pressure returns.
How feltiae clears your root-zone pests
Mix into water
Stir the nematode carrier into water at the labeled rate in a watering can or sprayer with a coarse nozzle.
Drench the media
Apply the solution to the growing media so it soaks the root zone where the pest larvae and pupae live.
Nematodes find the hosts
They move through the media, enter the pests, and release bacteria that kill each host within 48 to 72 hours.
They recycle and persist
New nematodes emerge from spent hosts to hunt again, holding control for two to four weeks. Reapply if pressure returns.
- Live Steinernema feltiae nematodes on a carrier
- Count matched to your chosen size
- Mixing and drench-rate instructions
- Insulated overnight packaging
- Pack sizes: matched to the area you need to drench
- Compatible with: soil, coco, hydroponics, and houseplants
- Pairs well with: Stratiolaelaps for a resident soil predator
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