Summit Mosquito Dunks Larvae Control Tablets

By Summit
Rated 4.6286 out of 5 stars


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$5.24 (-30%)Chewy Price
$7.49Chewy Price
In Stock
FREE 1-3 day delivery on first-time orders over $25

About This Item


  • Mosquito dunk spreads a bacterium that kills larvae before they grow up to become biting adults.
  • For use in any standing water including rain barrels, bird baths, koi ponds, tree holes, stock tanks, planter reservoirs and rain gutters.
  • Deadly to mosquito larvae but harmless to other living things with the active ingredient Bacillus thuringiensis subspecies israelensis (Bti).
  • When females lay their eggs in water treated with the dunks, the larvae will hatch and eat the bacterium.
  • Each dunk covers up to 100 square feet of water, regardless of depth for 30 days or more; for less water a portion can be used.

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Questions & Answers

14 Customer Questions

Will this harm my water turtles and goldfish that are in my small pond?
Answer by ChewyNov 26, 2019
This product can be used in your pond and it will not harm other living things such as birds, wildlife, children and pets.

Can this be put in a 3 gallon dog water bowl? Will it hurt dogs?
Answer by ChewyMar 18, 2018
This is not intended to be used in a drinking water bowl, and is not intended to be ingested.

can i put these in my horses waterer?
Answer by ChewyAug 16, 2019
This dunk can be used in animal watering troughs.

Can I put these in my fish tank with fish in it?
Answer by ChewyNov 12, 2017
These Tablets may be used in koi ponds, etc.

ReviewsWrite a Review

Rated 4.6286 out of 5 stars
35 Ratings
Would recommend to a friend

35 Customer Reviews

Rated 5 out of 5 stars
By Gina on May 22, 2023

Small bird repellent

Here in the northeast mosquitoes are vicious. They’ll carry away small animals and attack you without mercy. Tried these for the first time this year, and so far- the amount we see in the spring is significantly less than normal. Fingers crossed it continues to work through the year.

Rated 5 out of 5 stars
By osbo on Mar 21, 2023

Great Tablets

I've order this product before,satisfied with it.Not quite warm enough to use yet.When it gets hot,this will keep mosquitos from breeding in my pond.Recommend this for everyone with standing water.

Rated 5 out of 5 stars
By ByBymosquitos on Aug 28, 2022

Mosquito Dunks Larvae Control Tablets

I have several bird baths around the yard that get water in them from the lawn sprinklers and rain I just put one of the dunks in each and don't have to worry about creating a bed for mosquito larva.

Rated 3 out of 5 stars
By Nancy on Apr 5, 2022

Breaks up too easily clogging my fountain pump.

I read the reviews on this and thought I would give it a try on my 3-tiered barrel fountain. The instructions guide you as to how much to place in the water so I broke the ring into quarters and placed one piece in the bottom base of my fountain. It floats on top of the water and began breaking up into little "beads". I cannot verify whether these are working when my fountain pump is off during the night or not because I have seen many mosquitos flying around near the fountain during the morning hours. Also the beads are clogging my pump. I like the fact that they are harmless to fish/birds/etc., but will give it time to see the end results. They are fine in my bird bath but I never had an issue with mosquitos in that anyway as I change the water frequently and have a spray for that. I am on the fence with these but have the entire package to see actually if they work through the summer months. I will update my review if needed.

Rated 5 out of 5 stars
By Linda on Jul 9, 2022

Protect Yourself Against Mosquitos

These dunks are great for bird baths, rain barrels, watering cans, and any catch basin on your property where mosquitos can lay eggs and hatch.

Rated 5 out of 5 stars
By dogmom on Apr 26, 2022

prevent mosquitoes

it works. no more bites. just drop a piece in water and you won't see larvae any more. follow package directions.

Rated 5 out of 5 stars
By Robin on May 18, 2021

Love this stuff

I love the mosquito dunks! I throw some fresh ones in our pond once a month and it keeps my yard free of mosquitoes! Each spring we have an onslaught of mosquitoes, and that’s my cue to start my routine, they slowly diminish and at around one month later they’re gone for good (as long as I stay on the routine) They say on the label that they kill nothing but mosquitoes, and I love that!! I don’t want to hurt my fish or any other form of nature :)

Rated 5 out of 5 stars
By azyorkiemom on Jul 13, 2021

Great Product

Best product on market. Have a french drain with two drains that hold water. Tried many different products. The Mosquito dunks do exactly what’s they are supposed to do.

Rated 2 out of 5 stars
By Denise on Apr 21, 2021

Mosquito Dunk Larvae Control Tablets

Used (4 out of the 6 ) dunks in a relatively small flowerbed pond, but I am still experiencing mosquito issues on the patio, and still see more mature larvae in the water. I chose this because it said it would not harm other pond life (fish, frogs, etc..). But unfortunately, did not work as expected. I ended up getting a large net and swooping it through the water dumping the squirming larvae out in the grass for the birds to eat. HOWEVER, I DO love Chewy, their variety of products, and their responsiveness. I would definitely recommend them. They have quick mailing services, and excellent customer service.

Rated 5 out of 5 stars
By Chris on Sep 17, 2020

Killed Larva in Drains! Yeah!!

We have large drainage system in our yard and found we didn't have as many fleas in our grass as we had mosquito larva in our drains. 20 bites on my legs in the hour I was out playing with our dogs...they were getting bit too, but I couldn't find fleas on them! We sprayed our yard and still got bit. Well I ordered these little donuts, followed the directions and we do not breed mosquitos any longer. Wonderful stuff. Keeps our drains from being a breeding ground.