Bti (a natural bacterium; there are many types of BT) is toxic only to the larvae stage of mosquitoes, black flies, fungus gnats and some midges. It does NOT kill the eggs or adults; it kills the larvae after they hatch (and ingest the bti crystals which releases toxins in their gut), before they pupate and become nasty biting adults. It does not kill and is not toxic to fish, frogs, birds, mammals, humans and other insects (doesn't hurt dragonflies or their larvae either). The larvae have a certain type gut environment and enzymes that releases the toxin in the crystals and this kills the larvae by rupturing the cells in its gut. Because it only works on the larvae that is why you have to repeat treatments of the water areas and possibly use other means to control the adults that made it through or flew in from somewhere else. The bits and dunks are dried and are not living bacteria. The crystals/toxins come from the spores. Bits kill almost instantly, while the dunks release slowly and can be active for up to 30 days. So you could start off with the bits to quickly kill what larvae is there and then add in a dunk about a week later for longer protection. The dunks (not sure about the bits) have been approved for organic gardening by the USEPA too. Hope this helps.

Summit

Q: Will this work for fungus gnats?

Yes. There might be other ways to use it but what I did was put about a TBSP of the granules in a gallon of water and let it soak for a few days and then I water with that soak water. Works like a charm! Just be sure to use all of the soak water in a short period otherwise it gets slimy and stinky. If you have a heavy infestation of gnats flying around, the adults will continue to lay eggs (it only kills the larva) so you'll want to repeat about every 7-10 day until you no longer see the adults.

Q: The content in 1 bottle is equivalent to how many donut shape mosquito dunk ??

About 11 Dunks worth, by my math: This bottle covers 2178 square feet and lasts up to 2 weeks. The Dunks cover 100 square feet each and last up to 1 month. So half of 2178 (because you must apply it twice as often) is 1087.5 square feet, which is about 11 Dunks. The dunks seem just a wee bit more expensive, but they're more convenient to use. On the other hand, if you have small areas of water, the bits are more efficient. On the other-other hand, you may cut up the dunks to use in smaller areas. My choice = both: Dunks for my tiny pond and Bits for the smaller standing water areas near my fencing.

Q: are bits and dunks the same strength?

As far as I can tell, yes. But I will say, the granules are easier for some uses (like in bromeliads), and dunks in others (the rain barrels, or ponds). I have and use both. Dunks are too hard to break up for using in bromeliad cups.

Product ID: 253544325

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Details

Item form
Granules
Item weight
0.5 Pounds
Liquid volume
8 Fluid Ounces
Active Ingredients
Bacillus And
Brand
Summit

🌍EPA registered nationwide

🧴Compact 8 oz size

⏱️Kills larvae within 24 hours

Frequently Bought Together

Summit 116-12 Quick Kill Mosquito

Summit...responsible solutions 110-12 Mosquito Dunks, 6-Pack

Cleanuper 58 Pcs Flying Insect Traps for Plants,Indoors, Outdoors, Kitchen, Office, Yellow Sticky Traps for Fungus Gnat, Fly and Flying Insects, Non-Toxic & Odorless, Kid & Pet Safe, Economic Pack

Description

🦟 Stop mosquitoes before they start—fast, safe, and smart!

COMPACT CONVENIENT - 8-ounce size fits perfectly in your toolkit or outdoor essentials.
EFFORTLESS APPLICATION - Simply sprinkle in standing water—no complicated setup required.
NATIONWIDE EPA APPROVAL - Trusted and safe, EPA registered in all 50 states for peace of mind.
RAPID LARVAE ELIMINATION - Experience mosquito control that works overnight—larvae gone in 24 hours.
ECO FRIENDLY MOSQUITO DEFENSE - Harnesses biological agents for effective, environmentally sound control.

Summit Quick Kill Mosquito Bits deliver fast-acting, environmentally responsible mosquito control by killing larvae within 24 hours. EPA registered across all 50 states, this compact 8-ounce formula is easy to apply by sprinkling in standing water, making it the go-to solution for professionals seeking effective and safe mosquito management.

Specifications

Active Ingredient	Bacillus Thuringiensis Subsp. Israelensis,Strain Sum-6218 Solids,Spores And Insecticidal Toxins:2.86%,Other Ingredients:97.14%,Total:100.00%
Color	Multicolor
Size	Pack of 1
Style	8 Oz
Height	3 inches
Length	3 inches
Weight	1 Pounds
Width	6 inches
Shape	Round
Material Type	Plastic
Number of Items	1
Number of Pieces	1
Power Source	Manual
Included Components	Summit 116-12 Quick Kill Mosquito Bits, 8-Ounce
Batteries Included?	No
Brand	Summit
Department	Unisex-Adult
Manufacturer	Summit...reponsible solutions.
Item model number	116-12
Product Dimensions	14.99 x 6.86 x 6.6 cm; 226.8 g
ASIN	B0001LE1VC

Have a Question? See What Others Asked

Will this work for fungus gnats?

The content in 1 bottle is equivalent to how many donut shape mosquito dunk ??

what is in it?

are bits and dunks the same strength?

Reviews

A**A

Good

16.06.2025

K**Y

It works. Buy it. That’s all you need to know

This was a cure for my plant gnat misery and it worked in ONE DAY!

10.09.2024

T**H

Great product.

Delivery was good safely packaged. No mess application, just sprinkle. They seem to be doing what they're supposed to. Swimming pool. (Edit update: Did not have any mosquitos after 2nd application!!) good product.

22.12.2021

S**H

Works for 1 day only

I live in Springs, Dubai. The mosquitos were horribly preventing us from sitting in our garden. I sprinkled the bits all around my trees and watered them this morning. In around 12 hours I hardly see any mosquitos. The next day comes and they all came back. Doesnt work

8.05.2023

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