Pests Steinernema feltiae Nematodes Target
Steinernema feltiae nematodes are specialized soil-dwelling predators that eliminate over 200 pest species by targeting their larvae or pupal stages. They are particularly effective in controlling fungus gnats, root aphids, and thrips pupae but also contribute to managing a wide range of soil-dwelling insect pests.
Primary Pests Steinernema feltiae Target
- Fungus Gnat Larvae – A top choice for fungus gnat control, these nematodes eliminate larvae before they mature into flying adults.
- Thrips Pupae – Helps break the thrips lifecycle by infecting the pupal stage in the soil.
- Root Aphids – Attacks aphid nymphs that settle in the root zone. Works best when combined with other controls.
- Shore Fly Larvae – Reduces populations of these nuisance pests in wet, organic-rich media.
- Sciarid Flies – Targets larvae in greenhouse and indoor plant settings.
- Leafminer Pupae – Kills leafminer pupae that have fallen into the soil before they emerge as adults.
- Certain Beetle Larvae (Scarab Grubs, Flea Beetles, Weevils, & More) – Effective against soil-dwelling beetle larvae, including those of Japanese beetles and root weevils.
Other Pests They May Help Control
- Caterpillar Pupae – Attacks the pupal stage of various caterpillars, limiting their adult emergence.
- Subterranean Termites (Workers & Nymphs) – While not a primary control method, nematodes can infect termites in soil.
- Wireworms – Reduces wireworm populations when applied to infested soil.
- Onion Maggots & Cabbage Maggots – Kills maggots before they cause root damage.
Pests Steinernema feltiae Do NOT Control
Steinernema feltiae is not effective against the following pests:
- Hard-bodied insects – Adult beetles, mature weevils, and other armored insects are not suitable hosts.
- Flying adult insects – Nematodes only infect soil-dwelling larval and pupal stages, so they do not kill adult fungus gnats, thrips, whiteflies, or aphids.
- Dry-soil pests – Since nematodes require moisture to move, they are ineffective in dry soil conditions.
- Above-ground pests – They do not target leaf-feeding pests like aphids, spider mites, or scale insects on plant foliage.
Best Strategy: Use Steinernema feltiae nematodes in combination with predatory mites (like Amblyseius swirskii or Stratiolaelaps scimitus) for comprehensive pest management.
Why Choose Steinernema feltiae Nematodes?
- Multi-Pest Control – Effectively targets fungus gnats, root aphids, thrips pupae, and more.
- Fast & Long-Lasting – Kills pests within days and continues working as nematodes multiply.
- Works in Cooler Temperatures – Effective in soil as low as 46°F.
- Organic & Non-Toxic – Safe for plants, beneficial insects, and pollinators.
- Easy-Release Formula – Quick-dissolving powder ensures even distribution.
How They Work
- Seek & Destroy – Juvenile nematodes locate pest larvae and enter through natural openings.
- Release Bacteria – Inside the host, they release bacteria that kill pests within 2–5 days.
- Multiply & Spread – New generations of nematodes emerge, continuing pest suppression.
Works best in soil temperatures between 46–86°F and requires consistent moisture for mobility.
Why Choose Steinernema feltiae Nematodes?
- Multi-Pest Control – Effectively targets fungus gnats, root aphids, thrips pupae, and more.
- Fast & Long-Lasting – Kills pests within days and continues working as nematodes multiply.
- Works in Cooler Temperatures – Effective in soil as low as 46°F.
- Organic & Non-Toxic – Safe for plants, beneficial insects, and pollinators.
- Easy-Release Formula – Quick-dissolving powder ensures even distribution.
How They Work
- Seek & Destroy – Juvenile nematodes locate pest larvae and enter through natural openings.
- Release Bacteria – Inside the host, they release bacteria that kill pests within 2–5 days.
- Multiply & Spread – New generations of nematodes emerge, continuing pest suppression.
Works best in soil temperatures between 46–86°F and requires consistent moisture for mobility.
How to Apply Steinernema feltiae Nematodes
Step 1: Prepare
- Mix with room-temperature, dechlorinated water.
- Stir thoroughly before application.
Step 2: Distribute
- Use any preferred method to pour them in: sprayer, watering can, or cup.
- Evenly distribute over soil or growing media.
Step 3: Maintain
- Keep soil moist for 2 weeks to allow nematodes to establish.
- Avoid applying under direct sunlight.
Step 4: Watch
- You will see pest population decline in as little as 2 days!
- Nematodes will work for up to 6 weeks.
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What are Steinernema feltiae nematodes?
Steinernema feltiae (Sf nematodes) are microscopic, soil-dwelling roundworms that target and kill fungus gnat larvae, thrips pupae, root aphids, and other soil pests. They are a biological control method that eliminates pests without chemicals, making them safe for plants, beneficial insects, and the environment.
How do Steinernema feltiae nematodes work?
Once applied, these nematodes actively search for pest larvae in the soil. They enter the larvae through natural openings and release symbiotic bacteria, which kill the host within 2–5 days. The nematodes then reproduce inside the dead pest and release a new generation to continue the cycle.
How many nematodes do I need?
- Preventative use / Light infestation – 5 million per 300 sq. ft.
- Moderate to heavy infestations – 5 million per 50 sq. ft.
For active infestations, reapply weekly for 2–3 weeks, then maintain with monthly applications.r
How long does it take for nematodes to work?
Results start showing in 2–5 days, with continued pest suppression as nematodes reproduce and spread. Full control depends on the pest pressure and environmental conditions.
Can I use nematodes indoors?
Yes! Sf nematodes are safe and highly effective for houseplants, greenhouses, and hydroponic setups.
Will Steinernema feltiae kill beneficial insects?
No—these nematodes only target specific soil-dwelling pests and do not harm pollinators, predatory mites, or other beneficial organisms.
Do I need to reapply nematodes?
For active infestations, apply weekly until the population declines.
For prevention, apply every 4–6 weeks to maintain control.
Can I combine nematodes with other pest control methods?
Yes! For best results, pair Sf nematodes with:
- Sticky traps – To reduce adult fungus gnat populations.
- Stratiolaelaps scimitus (predatory mites) – For multi-stage soil pest control.
- Proper watering techniques – Avoid overwatering to discourage breeding conditions.