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  • Current Lot number: 352-656-PG30
  • Expiration date: 1/31/2028 (Stored properly in a dark environment at room temperature the manufacture states there is no hard expiration date but they suggest to use this lot within 2 years for peak effectiveness)

 

  • Gnatrol is OMRI-listed for organic production

 

Gnatrol Biological Larvicide. Fungus gnat larvae don’t stand a chance.

Gnatrol is a highly selective, biological larvicide for use in greenhouses to control fungus gnat larvae. It may be used on a wide variety of ornamentals, as well as all bulb crops, bedding plants and vegetable sets. Once the larvae have ingested Gnatrol, they become paralyzed, stop feeding immediately and die—usually within 24 hours. Gnatrol is now available in a water dispersible granule (WDG) formulation that will not leave a residue and is easier to measure for increased application accuracy. 

 

Gnatrol WDG is listed by the Organic Materials Review Institute (OMRI) for use in organic production.

 

28 grams (1 ounce) of concentrate will make 3.84 - 12 gallons for an active fungus gnat problem (1-3 teaspoons gnatrol for each 1 gallon of water. 

(31.25 gallons at the preventative maintance rate of 1/4 teaspoon per gallon).

For use as a soil drench or in a hydroponic system.

 

 

Bacillus thuringiensis, subsp. israelensis, strain AM 65-52

fermentation solids, spores and insecticidal toxins . . . . . 37.4%

Other Ingredients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.6%

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100.0%

 

EPA Reg. No.: 73049-56 

EPA Est. No.: 33762-IA-01

Net Weight: 1 pound

1 Pound Gnatrol WDG Organic B.T.I.

$64.99Price
Quantity
  • All standard domestic shipping is free. Upgraded shipping options are available in the checkout.

How Gnatrol WDG Works

Gnatrol WDG targets fungus gnat larvae in soil, stopping infestations at the source.

Step 1:
Mix Gnatrol WDG with water

Step 2:
Apply to moist soil

Step 3:
Repeat every 5–7 days for 2–3 weeks

Fungus Gnat FAQ

How long does Gnatrol WDG take to work?

Gnatrol kills larvae within 24–48 hours.
Visible results typically appear in 7–10 days as adult gnats die off.

Why do I need to make applications every 5-7 days?

Gnatrol only kills larvae while they are actively feeding, and each application remains effective for a limited time. Reapplying every 5–7 days ensures newly hatched larvae are targeted, breaking the life cycle over 2–3 weeks.

Is it safe to use Gnatrol WDG indoors around people and pets?

Safe for indoor use  •  Pet friendly 
The naturally occurring soil bacterium (BTI) specifically targets fungus gnat larvae.

BTI is harmless to people, pets, and plants. 

Should I continue to use Gnatrol after Fungus Gnats are gone?

Yes — small monthly applications help prevent future infestations, especially if you bring in new plants, new soil, or move plants between indoor and outdoor environments.

Kill fungus gnat larvae in 24–48 hours — without chemicals

fast shipping / safe / organic

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