Grow Organic Mosquito Bt Dunks

The dunks contain a naturally occurring bacterium called Bacillus thuringiensis israelensis (Bti). When placed in water, they release this bacterium, which specifically targets mosquito larvae as they feed, disrupting their growth cycle before they can mature into biting adults.

Yes. The active ingredient in these dunks is highly selective, meaning it targets mosquito, fungus gnat, and black fly larvae without harming fish, frogs, birds, pets, or beneficial insects like bees.

Each dunk covers approximately 100 square feet of water surface area. For smaller areas like rain barrels or birdbaths, you can break the dunk into smaller pieces to match the size of your container.

While the active ingredient is depleted after 30 days, the physical dunk itself will eventually break down. You can leave the remains in the water or remove them if you prefer a tidier look, but you will need to add a fresh dunk to maintain protection.

No, the dunks are designed to be rain-resistant. Because they are placed directly into the water source, rainfall will not dilute or wash away the treatment, ensuring consistent protection throughout the 30-day period.