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BTI Mosquito Briquets are a sustained-release larvicide that conveniently floats right on the water surface. These briquets can be used in virtually any standing water site where mosquito larvae grow. As the briquets float, BTI (or bacillus thuringiensis israelensis, a natural mosquito-killing biocontrol agent) is slowly released at the water’s surface and gradually settles in the water where it is consumed mosquito larvae. Bti kills mosquito larvae before they are able to grow into mature, biting adults, eventually controlling the mosquito population. Additionally, the toxin will continue to be released into the water for a period of 30 days or more, providing continuous kill. Each briquet will effectively treat up to 100 square feet of surface water regardless of depth.
Product Documents
| Active Ingredient | Bacillus thuringiensis subspecies israelensis Strain BMP 144 solids, spores and insecticidal toxins 10.31% |
|---|---|
| Target pests | Mosquitoes and Psychodid Flies, and their larvae |
| For use in | bird baths, old automobile tires, rain barrels, abandoned or unused swimming pools (particularly above ground types), tree holes, roof gutters for collecting rainwater, flower pots, animal watering troughs, elevator shafts, basements that flood, sump pumps and any drainage areas within buildings |
| Pet safe | Yes, if used as directed on Label |
| Yield | 1 briquet treats up to 100 sq ft of water |
| Shipping Weight | 0.80 lbs |
| Manufacturer | Summit Chemical (Mfg. Number: 13821) |
| UPC | 018506001117 |
| EPA Registration | 6218-47 |
Pesky mosquitoes love to live and breed in damp and wet areas where there is little or a lot of standing water, such as conatinerized ponds, flower pots, flooded basements roof gutters and old car tires. If left undisrupted in these natural habitats, mosquito populations will continue to thrive. To address this problem, Summit Chemical has created Bti Mosquito Briquets, a sustained-release larvicide that conveniently floats right on the water surface. These briquets can be used in virtually any standing water site where mosquito larvae grow. As the briquets float, Bti (or bacillus thuringiensis israelensis, a natural mosquito-killing biocontrol agent) is slowly released at the water’s surface and gradually settles in the water where it is consumed by mosquito larvae. Bti kills both the mosquito larvae before they are able to grow into mature, biting adults. Additionally, the toxin will continue to be released into the water for a period of 30 days or more, providing continuous kill. Each briquet will effectively treat up to 100 square feet of surface water regardless of depth. For smaller surfaces, use ¼ or ½ briquet as directed on the product label. Alternate wetting and drying of this product will not reduce its effectiveness, so each briquette may be used and reused. Unused briquets will remain effective indefinitely. To prevent dunks from being washed away, anchor them using a string tied through the center hole, or they can be staked in place. Mosquito Briquets contain no poisonous chemicals and are harmless to other living things. May be used as either a pre- or post-hatch treatment.
Directions for Use:
These briquets/dunks may be used in all types of mosquito breeding areas. To prevent briquets/dunks from being flushed out of certain treatment sites, they can be anchored using string tied through the hole in the center or staked in place.
Pre-flood treatment.
If the briquets/dunks are applied to dry areas listed on the label which are known or suspected to become breeding sites when flooded, such as abandoned swimming pools, the briquets will float to the surface when flooding occurs and start releasing the active Bti material. Alternate wetting and drying will not reduce their effectiveness.
APPLICATION RATES
Mosquito Larvae:
Flooded larvae breeding sites: Use one (1) Summit B.t.i. BRIQUET/DUNKS for up to 100 sq. ft. of surface area, regardless of depth. In water with a high organic content, such as sewage disposal systems or waste lagoons, the application rate may have to be increased to as much as four (4) times the normal dosage based upon evaluation by the user.
When larval populations are high, aquatic vegetation dense, or the water highly polluted at the time of briquet/dunks use, pre-treatment with SUMMIT MOSQUITO BITS® is recommended. The briquet/dunks will then suppress larval development for up to 30 days or more. Some larvae which hatch after briquet/dunks application may partially develop before dying. Allow a minimum of 48 hours for their control.
Pre-Flood treatment: Apply one (1 ) Summit B.t.i. BRIQUET/DUNKS to each 100 sq. ft. of dry bed surface which is known or suspected breeding site when flooded.
Evaporative Coolers: Apply one (1) Summit B.t.i. BRIQUET/DUNKS to each 100 sq. ft. of Cooler box or for smaller Coolers refer to the table below for application rate.
SAFE FOR USE IN FISH HABITATS
Outdoor Use around the Household to kill Mosquito Larvae:
Summit B.t.i. BRIQUETS/DUNKS can be broken into portions for use in many outdoor applications near the household, such as standing water in bird baths, old automobile tires, rain barrels, abandoned or unused swimming pools (particularly above ground types), ditches, tree holes, roof gutters for collecting rainwater, flower pots, animal watering troughs or any other locations near the household where water collects and remains for periods of time. Summit B.t.i. BRIQUETS/DUNKS can be broken and used as shown in the following table, the amount dependent upon the surface area of water in the treatment site. Mosquito Dunks / Bti Briquets may also be used in any containerized standing water found near the home.
Preflood treatment around the Household: Apply Summit B.t.i. BRIQUETS/DUNKS to any dry surface listed on the label which is known to become flooded after a rain. Use the correct amount in accordance with the above dosage table.
INDOOR USE: For use in areas that collect water from time to time areas such as elevator shafts, basements that flood, sump pumps and any drainage areas within buildings. Use the correct amount in accordance with the above dosage table.
Waste WaterTreatment Plants: Place Summit B.t.i. BRIQUETS/DUNKS in a perforated basket, such as a minnow bait basket, and suspend the basket in the waste water stream before the water enters the trickling filter. Keep basket continuously filled with Briquets/Dunks to ensure a steady flow of Bti into the filter. The number of Briquets/Dunks needed for continuous, effective treatment in each facility will be dependent upon the volume and flow rate of the stream. This will have to be determined by the user.
Mosquito Dunks Work for Our Large Pastures
By Donna on 09/05/2010
We purchased 100 mosquito dunks for a horrible mosquito problem we had in our pastures. We didn't want anything poisonous for animals, but we needed something to get rid of them. Since our last irrigation, they have been cut in half and we hope with another go around of it, that we can diminish them down even further. I like that it kills the larva. The only down side for us is with 5 acres of pasture it would be nice if I could find something less labor intensive, i.e., something I could just drip into our irrigation system without have to walk the whole area placing these donuts out. Great product. Does it come in a concentrated liquid form for irrigation?
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66 of 72 people found this review helpful
Definitely works
By Tr on 03/27/2015
I work in the Health Dept for my county. The guys in Environmental Health use these dunks as the main component for their mosquito abatement program. They tell me that the dunks are appropriate organic controls, meaning organic farmers won't lose their organic certification for using these. I have a pond on my property and get clouds of mosquitos if I don't use these dunks. The thing is with these dunks is that you have to use them in a timely manner or a hatch of skeeters will get past you. I found critters like to eat these. So keep an eye out after you dunk them somewhere. If you tossed them somewhere and you still got skeeters, your dunk may have gotten eaten before it could affect the skeeter larvae.
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63 of 65 people found this review helpful
Surprised by insecticide in this biological product.
By Joe on 04/26/2012
Verified Purchase
I bought this product because it said it is safe. I may have read the description wrong but I thought that there would be no harmful chemicals in this product. That was what sold me with this product since my dog and little girl use the backyard where the dunks have been applied. To my surprise on the back of the packaging it says to not breathe in the dust, get on your skin, or in your eyes because of the chemicals in the product. I do not believe this product is just a biological control as described. I am not saying it is a bad product, it is working, you just get a few extra ingredients than what you pay for.
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54 of 86 people found this review helpful
Control those mosquitoes
By Ona on 05/03/2010
Verified Purchase
These are the best way to control mosquitoes in open rain barrels. We have used them for years but now that we have 5 barrels had to have a better price then at the box stores. Delighted for find them on line for 1/2 the price we had previously paid. We received them very quickly and have them in all the barrels at the present time.
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52 of 53 people found this review helpful
Mosquito Dunks
By Leslie on 06/30/2010
I can't find dunks in Costa Rica, where I have a second home. Mosquitos down there can carry dengue and malaria. Yet preserving the environment for the great numbers of living things down there requires using something organic and natural. I put a dunk in my gray water drains once a month. Sometimes I drop one down the street in the rain culvert that is always damp. Within a few days there is a dramatic reduction in the numbers of mosquitos at my home. The dunks work GREAT!
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37 of 38 people found this review helpful
No,BTI Mosquito Dunks should not be used in water that is not contained. Here are some examples of places you can use this product: bird baths, old automobile tires, rain barrels, abandoned or unused swimming pools (particularly above ground types), tree holes, roof gutters for collecting rainwater, flower pots, animal watering troughs, elevator shafts, basements that flood, sump pumps and any drainage areas within buildings.
The drain in our basement for the water heater always has standing water, as it should, but this year we keep having drain flies there. I dump boiling water in there regularly, but they keep coming back. It's been snaked already. So now I am wondering if putting a dunk in there would work? I see a previous answer that this product is effective for drain flies. Awesome. But I am wondering if it is safe in a drain with standing water? Or is there a better product? Thank you!
BTI Mosquito Dunks cannot be used in drains but is a great product for drain flies in listed areas outside only. For treatment of your drains, you can use the Invade Bio Bullet.
I read some questions and answers, one you said not safe for ponds, the next set of questions and answers you said they are meant to be for ponds, so which is it? And if they are safe for birds to drink out of why not fish
BTI Mosquito Dunks contain no poisonous chemicals and are harmless to other living things. BTI Mosquito Dunks will not harm turtles fish or birds. It is safe to use in areas such as ponds and bird baths where birds and turtles would be present.
Want to use a dunk in a decorative planter that looks good on my deck. It has some dirt on the bottom. Will the dunk still be effective?
As long as there is some standing water or wet soil where you place it in the planter the BTI Mosquito Dunks will work effectively to sterilize the water that is there and prevent mosquito breeding within it.
The BTI Briquets/dunks will not normally migrate anywhere it will simply slowly break down until gone in standing water areas where you don't want pest reproduction to occur. If any of the product did get into the water table somehow it would not be a problem as this product does not harm us and can be used in drinking troughs for animals, in ponds with fish being caught for consumption, and in rain barrels where the water is used to water vegetables.
I have dunks in all my rain barrels. They are still present and floating after 40 days. How do I know when they have stopped being effective and when to replace them?
BTI Mosquito Dunks can last for up to 30 days.
Each briquet of the BTI Mosquito Dunks will effectively treat up to 100 square feet of surface water regardless of depth.
I have alot of trees and a huge yard. I have one side that holds water and other side have trees and don't hold water. How should I treat it? Thanks
As a method for controlling fungus gnats on indoor plants, my local garden center instructed me to break up a mosquito dunk & put it into a 5-gallon pail of tap water, let it stand for 24 hours, then use it for watering indoor plants, continue to refill it after each watering & until all the floating bits were used up. Will this work?
Yes, BTI Mosquito Dunks can be utilized in this way.
The BTI Mosquito Dunks are designed to coat the top of the water surface and slowly break down over a 30 day time frame. Since you did not specify what type of water area you are referring to where water would be changed out, we cannot accurately answer your question. If a dunk is still a solid piece floating in the water it is still actively breaking down and could potentially be moved into a new water area, but would not last as long as a new dunk.
Yes, mosquitoes will continue to lay eggs in water treated with BTI Mosquito Dunks. This product kills mosquito larvae before they are able to grow into mature, biting adults, eventually controlling the mosquito population.
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Female mosquitoes will still be able to lay eggs but none will be born when using BTI Mosquito Dunks. This product controls their breeding.
Water that has been treated with BTI Mosquito Dunks should have no adverse effects on your orchid plants.
The product label for BTI Mosquito Dunks states, "Use one (1) MOSQUITO DUNK for up to 100 square feet of water surface, regardless of depth. They can be used whole or broken into portions and applied to containerized standing water found near the home..."
Please refer to the table on the product label for how many dunks to use in waters below 100 square feet of water surface.
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0 of 4 people found this answer helpful
Per the manufacturer, BTI Mosquito Dunks have a woody smell but it would not cause a barrel of water to have a strong odor.
BTI Mosquito Dunks
Rating: 4.7 (82 Reviews / 94 Q&A)
