The floating dunks that wipe out mosquito breeding in a rain barrel
Is this the right fit?
- Best for
- anyone with a pond, rain barrel, swimming pool that sits unused, kayak storage that catches rain, or a yard with mosquito breeding zones you can't drain
- Skip if
- Works only on mosquito and black fly larvae, not adult mosquitoes already flying around the yard
- Check before ordering
- Confirm the dimensions, exact model, included parts and return terms on the Amazon listing before ordering.
Listing-based buying notes. We have not tested this product hands-on. Confirm the selected size, seller and current terms on Amazon.
Compare other backyard & outdoor living essentials →- Check Amazon for shipping eligibility
- Check the item's current return terms
- As an Amazon Associate we earn from qualifying purchases
Summit Chemical's Mosquito Dunks are a biological larvicide (BTI, Bacillus thuringiensis israelensis) shaped into floating donut tablets that kill mosquito larvae in any standing water for 30 days per dunk. Safe for pets, fish, birds, wildlife, and edible garden plants because BTI only affects mosquito and black fly larvae, nothing else. Drop one in a rain barrel, pond, bird bath, plant saucer, or low-lying puddle, and you stop the entire breeding cycle without spray, fog, or zapper. Best fit: anyone with a pond, rain barrel, swimming pool that sits unused, kayak storage that catches rain, or a yard with mosquito breeding zones you can't drain.
Pros
- Biological (BTI), so it's safe for pets, fish, birds, and edible plants
- One dunk lasts 30 days in 100 square feet of standing water
- No spray, fog, or zapper, just drop and forget
Cons
- Works only on mosquito and black fly larvae, not adult mosquitoes already flying around the yard
Frequently asked questions
Are they safe for pets, fish, and birds?
Yes, BTI is the active ingredient and it only affects mosquito and black fly larvae. Safe for ponds with koi, bird baths, garden runoff, and yards where pets play.
How long does each dunk last?
Up to 30 days in 100 square feet of standing water. In smaller containers (bird bath, plant saucer), break a dunk into quarters and toss in a piece.
Will they kill adult mosquitoes already buzzing around?
No, dunks only kill larvae in the water. To stop a current population, use dunks plus an adult-targeting solution like a yard spray or fan-based trap.
How many come in a pack?
The 30oz bag contains about 20 dunks, which covers a normal-sized yard for an entire season of weekly placements.
More from this category
