✔ Expiration Date: 01/31/2028
(When stored properly in a cool, dark environment at room temperature, the manufacturer states there is no strict expiration date. However, best effectiveness is recommended within 2 years.)
✔ OMRI Listed for Organic Production
✔ Kills fungus gnat larvae in 24–48 hours
✔ Safe for houseplants, hydroponics, coco coir, and soil grows
What Is Gnatrol BTI?
Gnatrol WDG is a biological BTI larvicide that targets fungus gnat larvae directly in the soil. It is widely used by greenhouse growers, hydroponic growers, and indoor gardeners to control fungus gnats at the source.
Once fungus gnat larvae ingest Gnatrol, they stop feeding almost immediately and typically die within 24–48 hours.
The water-dispersible granule (WDG) formulation mixes easily with water, leaves minimal residue, and allows accurate measuring for consistent application.
Recommended Uses
Suitable for:
Houseplants
Hydroponic systems
Coco coir
Soil grows
Organic gardening
Greenhouses
Ornamentals
Vegetable starts and bedding plants
Terrariums
Composting toilets
Apply as a soil drench or through hydroponic reservoirs.
Mixing Instructions
16 ounces of Gnatrol concentrate makes:
Up to 168 gallons at 1 teaspoon per gallon
Lower maintenance rates may treat even larger volumes
Application rates may vary depending on infestation severity.
Active Ingredient
Bacillus thuringiensis subsp. israelensis (BTI), strain AM 65-52
Fermentation solids, spores, and insecticidal toxins .......... 37.4%
Other ingredients ............................................................. 62.6%
Total ................................................................................. 100.0%

1 lb Gnatrol WDG Organic BTI Fungus Gnat Larvicide

Name: 1 lb Gnatrol WDG Organic BTI Fungus Gnat Larvicide
Brand: Valent

$64.99

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Quantity

Coverage depends on application strength:

• Heavy infestation rate (3 tsp per gallon):
16 ounces Gnatrol treats approximately 56 gallons of water

• Maintenance rate (1/4 tsp per gallon):
16 ounces Gnatrol treats approximately 672 gallons

Suitable for fungus gnat control in:
• Houseplants
• Hydroponics
• Coco coir
• Soil grows
• Organic gardening
*To be 100% effective 3 applications need to be made over 15 days.

Apply once every 5 days to break the life cycle.

Application:

1/4 - 1/2 teaspoon makes one gallon for preventative use.

1 teaspoon per gallon for an active light infestation.
2 teaspoons per gallon for a medium infestation.
3 teaspoons per gallon for a heavy infestation.

Apply it to the top 2 inches of soil as a drench every 5 days until the adults are not flying around anymore. Usually 15-20 days or less to fully eradicate them.

Hydroponic application is the same mixture per gallon as soil but with a large reservoir it's easier to use weight per gallon over teaspoons:

preventative use: 23- 46 grams per 25 gallons

Light infestation: 1-1.5 ounces per 25 gallons

Medium infestation: 2-3 ounces per 25 gallons

Heavy infestation: 3.25 - 6.5 ounces per 25 gallons

*As in soil you need to add Gnatrol to your hydroponic tank three times total, once every 5 days to break their life cycle.

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1 lb Gnatrol WDG Organic BTI Fungus Gnat Larvicide

Coverage & Mixing Rates

Product Documents

Application Instructions: