Mosquito Dunks are safe for birds, pets, and pond fish. Their active ingredient targets mosquito larvae specifically, and manufacturer labeling states they are safe for use around birds, wildlife, children, and pets, with EPA approval for use in animal watering troughs and fish habitats.
What is the active ingredient in Mosquito Dunks and why is it safe for other animals?
The active ingredient in Mosquito Dunks is Bacillus thuringiensis subspecies israelensis, or B.t.i., a bacterium described by the manufacturer as deadly to mosquito larvae but harmless to other living things. Floating on the water's surface, a dunk slowly releases the bacteria, which mosquito larvae ingest; the bacteria then disrupts the larva's digestive system, killing it within hours. Because B.t.i. is described as very target specific for mosquitoes, the manufacturer states it does not adversely affect other organisms sharing the same water.
Are Mosquito Dunks safe for pond fish specifically?
Mosquito Dunks are safe for pond fish, since B.t.i. is approved by the EPA for use directly in fish habitats. The dunks are labeled for use in koi ponds and other water gardens alongside live fish, without needing to remove the fish first.
Are Mosquito Dunks safe for birds that use a birdbath or rain barrel?
Mosquito Dunks are safe for birds that drink from or bathe in a treated birdbath or rain barrel, since the product label states it is safe for use around birds and wildlife. A dunk can be floated directly in a birdbath, rain barrel, or similar water feature a bird might visit, since B.t.i. affects mosquito larvae rather than birds drinking or bathing in the same water.
Are Mosquito Dunks safe for pets, including a dog that eats one?
Mosquito Dunks are safe for pets, and the manufacturer states that even a dog eating an entire dunk will not be adversely affected. This tolerance comes from the same target-specific action described above: B.t.i. disrupts a mosquito larva's digestive system in a way that does not translate to cats, dogs, or other pets that might drink treated water or chew on a dunk.
Where can Mosquito Dunks be used around a yard?
Mosquito Dunks can be used in any standing water that collects and sits for more than a few days, since that is where mosquito larvae develop.
- Ponds and water gardens, including those with koi or other pond fish
- Bird baths and rain barrels
- Flower pots and their saucers
- Gutters and other spots where water pools after rain
- Animal watering troughs
- Swamps, puddles, or other standing water on a larger property
What pack sizes are available for treating different amounts of water?
Mosquito Dunks are sold in four pack sizes, since one dunk treats about 100 square feet of surface water for 30 days or more and the right count depends on how much water needs ongoing coverage. A Mosquito Dunks, 2-Pack suits a single rain barrel or small container. Stepping up, the Mosquito Dunks, 6-Pack covers a handful of containers or one larger water feature across a season. For a yard with a pond or several water sources, the Mosquito Dunks, 20-Pack stretches coverage further without a mid-season reorder, and the Mosquito Dunks, 100-Pack is labeled for both residential and commercial use across multiple water sources.
Frequently Asked Questions
Is it safe for a dog to eat a Mosquito Dunk?
Yes. The manufacturer states that even if a dog eats an entire dunk, this will not adversely affect the animal, since B.t.i. targets mosquito larvae specifically.
Do Mosquito Dunks harm pond fish or koi?
No. Mosquito Dunks are EPA-approved for use in fish habitats, including koi ponds, without needing to remove the fish before treating the water.
Are Mosquito Dunks safe for birds that drink from a treated birdbath?
Yes. The product label states Mosquito Dunks are safe for use around birds and wildlife, so a dunk can be floated directly in a birdbath a bird drinks from or bathes in.
How long does one Mosquito Dunk last in water?
One Mosquito Dunk treats about 100 square feet of surface water and lasts 30 days or more before it needs replacing.
