Summit Mosquito Dunks 20-Count Tablets — BTI Larvicide, Up to 30-Day Slow-Release Protection

Summit Mosquito Dunk Tablets are BTI larvicide discs that prevent mosquito larvae from developing in standing water for up to 30 days per dunk.

Summit Mosquito Dunks come as a 20-count pack of slow-release tablets designed to treat small pools of stagnant water where mosquitoes breed. Each dunk releases Bacillus thuringiensis israelensis (BTI), a naturally occurring bacterium that targets only mosquito larvae, providing an easy, low-maintenance approach to reducing local mosquito populations without harming people, pets, wildlife or fish.

How do these dunks stop mosquitoes from multiplying?

When placed in standing water, the dunk gradually releases BTI, which is ingested by mosquito larvae and disrupts their development. The active ingredient is species-specific and works on larvae stages before they become biting adults, helping to break the life cycle in treated areas.

• Each dunk treats about 100 square feet of surface water.
• Slow-release formulation provides protection for up to 30 days.
• Targets larvae stages only—applies before adult emergence.
• Works in a variety of containers: birdbaths, ponds, gutters, tires, and more.

Are Summit Mosquito Dunks safe for pets, fish, and wildlife?

Summit dunks use BTI, a biological agent that is toxic to mosquito larvae but considered safe for humans, pets, livestock, birds and most aquatic animals. Because it is narrow-spectrum, it avoids broad environmental harm associated with many chemical insecticides.

• Non-toxic to mammals and birds when used as directed.
• Compatible with fish ponds when label instructions are followed.
• No protective gear required for routine placement.
• Environmentally targeted alternative to broad-spectrum pesticides.

How and where should I use a dunk for best results?

Place a single dunk in any container or shallow area of standing water and leave it undisturbed; it will slowly dissolve and release BTI. Replace the dunk every 30 days or sooner if it is fully consumed or after heavy rains that flush the water volume.

• Works well in birdbaths, decorative ponds, rain barrels, and gutters.
• One dunk covers roughly 100 square feet of water surface.
• Use multiple dunks proportionally for larger water bodies.
• Remove and replace monthly or as directed on the label.

Will the dunks affect garden plants or the water's appearance?

The dunks are formulated to dissolve slowly and generally do not harm plants; they may release minimal particulate matter as they break down. Visible change to water clarity is uncommon, and routine placement won't hinder normal garden or pond use.

• Minimal residue—dunks break down into biologically inactive material.
• No known phytotoxic effects when used according to directions.
• Safe around ornamental plants and landscaping features.
• Remove spent material if aesthetic concerns arise.

Who is this for: Summit Mosquito Dunk Tablets are ideal for homeowners, landscapers, and property managers who want a targeted, low-effort method to control mosquito larvae in standing water. They suit anyone maintaining birdbaths, small ornamental ponds, rain collection systems, or hard-to-drain containers and who prefers a biological larvicide over broad chemical sprays.