FGMN Nursery
Sf Nematodes - Fungus Gnat Exterminators
Sf Nematodes - Fungus Gnat Exterminators
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Still Seeing Fungus Gnats No Matter What You Try?
Sticky traps aren’t solving it. Neem isn’t getting into the soil.
That’s because the problem isn’t flying around—it’s living underground.
Steinernema feltiae is your treatment for fungus gnat larvae, thrips pupae, and other soil-dwelling pests. These microscopic beneficial nematodes hunt through the topsoil, enter pest larvae, and release symbiotic bacteria that kill from the inside. It’s biological warfare—minus the spray bottle.
Steinernema feltiae (Easy-Release Powder)
Natural Soil Treatment for Fungus Gnats, Thrips Pupae, and Root Aphids
Once inside a host, these nematodes reproduce and spread—creating a self-sustaining population that continues working long after application. All they need is a bit of moisture and a stable temperature range.
Each application gives you rapid suppression of pests and long-term prevention. No residue. No re-entry delay. No harm to the good guys.
What It Treats
| Pest | Life Stage |
|---|---|
| Fungus gnats | Larvae (soil stage) |
| Thrips | Pupae (in substrate) |
| Root aphids | Soil-dwelling forms |
| Scarab beetles, flea beetles, weevils | Larvae and grubs |
| More | Dozens of soil-based pests |
If you’re seeing fungus gnats that keep coming back, this is how you stop the life cycle at the root.
Why Choose the Easy-Release Powder?
| Feature | Benefit |
|---|---|
| Fast action | Infective juveniles kill larvae within 2–5 days |
| Self-replicating | Reproduces underground for longer control |
| Cool-weather performance | Works in soil temps as low as 46°F |
| Quick-dissolving | Powder mixes easily for even coverage |
| Safe | No impact on plants, people, pets, or pollinators |
This is a soil-first solution for pests that sprays can’t touch.
When to Use It
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You’ve seen fungus gnats flying—but traps aren’t solving it
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You’re spotting thrips again after foliar treatment
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You’ve treated above-ground pests but still have root problems
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You want biological control with no residue
How to Apply
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Pre-water the soil to keep it evenly moist
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Mix powder into non-chlorinated water (59–69°F)
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Apply using a watering can, sprayer, or irrigation
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Water lightly again to help nematodes reach pest zones
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Keep soil lightly damp for 2 weeks post-application
Avoid full sun, dry soil, or extreme temperatures during and after application.
How Much to Use
| Use Case | Rate |
|---|---|
| Preventative or light pressure | 5 million per 300 sq. ft. |
| Moderate to heavy infestation | 5 million per 50 sq. ft. |
| Reapplication | Every 2–4 weeks if needed |
Repeat weekly if pressure is high or if conditions are ideal for gnat cycling (humid, organic-rich soil, indoor plants).
Best Conditions
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Soil temp: 46–86°F
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Moisture: Damp but not soaked (don’t flood)
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Light: Apply in early morning, evening, or on cloudy days (UV-sensitive)
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pH: Neutral to slightly acidic is ideal
Pro Tips
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Don’t overwater. Nematodes move best in moist—not saturated—soil
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Skip the sprays. Insecticides (even organic ones) can wipe them out
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Repeat as needed. They reproduce, but reapplication helps break life cycles
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Combine with above-ground predators (e.g., Orius, Swirskii, Persimilis) for full lifecycle suppression
Safe for Everything That Isn’t a Pest
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No toxicity
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No re-entry interval
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No residue
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Works in organic, regenerative, and soil-based systems
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Zero harm to pollinators, pets, beneficial insects, or soil microbes
Shipping & Storage
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Ships with live delivery guarantee
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Store at 35–50°F, refrigerated (not frozen)
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Use within 30 days
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Once mixed with water, use within 6 hours
Soil/Mulch Quantity Calculator
Soil/Mulch Quantity Calculator
Shipping & Returns
Shipping & Returns
SHIPPING:
Products marked with free shipping will be free shipping at checkout. Otherwise, bulk per cubic yard delivery fee per truck is the same amount whether the truck is at minimum or maximum capacity. You may want to know the following guidelines:
- One small truckload full capacity: 9yd soil, 9yd compost, 10yd mulch, 5yd fill, 7yd contractor mix.
- One large truckload maximum capacity: 20yd soil, 20yd compost, 20yd mulch, 18yd fill, 20yd contractor mix.
The best value is always a maximum truckload for your particular product.
We can mix loads in the small truck to bring two products at once with 8 to 9 cu yd maximum, depending on the products needed. You must contact us to request a quote in this circumstance.
If you order online we will contact you shortly after purchase to schedule your delivery day and time frame. We often can do same day deliveries with a small truck quantities, call 727-645-5289 or message us here to find out.
The small truck delivery is generally 1 to 3 work days notice M-S and the big truck delivery is generally 2 to 6 work days notice M-F. If you have a specific day and time in mind then it's best to make your purchase A.S.A.P in order
to help ensure the day and time you need is available.
The delivery fee is calculated during checkout based on product type (weight),
product quantity, size of truck(s) and number of truckloads needed.
If you prefer to communicate directly to a representative to get a quote, click here.
RETURNS:
There are no returns once the product is delivered. Most of our bulk garden supplies weigh 800 to 1600 lbs per cubic yard and require heavy trucks and equipment to move in bulk.
REFUNDS:
A refund can be processed if you cancel an order at least 2 hours before the start of your scheduled delivery day and time frame. There's no refund within 2 hours of your scheduled delivery day and time frame.
Dimensions
Dimensions
3'x3'x3' per cubic yard
27 cubic feet per cubic yard
Let customers speak for us
Excellent communication and price. Will use them again!!!
Love this Compost! My garden does great every year and it's because of
this great Compost Mix. I would not use anything else.
Great dirt and great communication
Started a new garden and it seems to be helping all of my new starter plantings
Product was great! Ordered some seeds as part of a gift along with a gardening apron. Was a quality item, arrived quickly and it was a big hit!
Super fast service and answered all my questions!
Great service each time I used them, 3 times now.
He delivered great organic topsoil the same day. Excellent subsurface for sod. Friendly and fast, very careful during delivery.
The mulch was great. No junk in it like the bagged stuff. AsS with all outdoor projects weather is a thing. They were understanding of delays and changes.. And when the day came for delivery, there was plenty of communication and showed up on time. Plus the price was right!
I am very happy with my soil purchase! Great company to do business with! I highly recommend!
It works well. I just wish it had some residual to it so I wouldn't have to spray every few weeks.
Good and high quality, best pants from a soil company ive ever bought.
If you want a quick turn around when ordering soil, this is your guy. If you want someone to dump soil where YOU want it, this is your guy. If you want someone to sell you good soil instead of sand and broken up pallets, this is your guy. It seems weird that a guy and his wife would be so excited about dirt, I know. But we were. It’s the beginning of a big transformation for our house. So we ordered this, I think on and Saturday and surprisingly he said he could deliver it on Monday! So Monday, we woke up and literally wished each other a happy dirt day. I went to work and sure enough, he showed up on time and dumped the dirt exactly where we were hoping. And when I got home I walked over and before I could get there, you could smell the organic material in the dirt. Our plants will love this. Excellent quality. Excellent transaction. Excellent service. Couldn’t be happier.
