Mosquito Dunks® Biological Mosquito Control

Long-Lasting Control of Mosquito Larvae in Standing Water

Mosquito Dunks® are a biological mosquito control product designed to kill mosquito larvae before they develop into biting adult mosquitoes.

Each donut-shaped Dunk contains Bacillus thuringiensis subspecies israelensis (Bti). This naturally occurring bacterium is specifically effective against mosquito larvae.

Simply place a Mosquito Dunk in standing water. The Dunk slowly releases Bti and continues working for 30 days or more. Each Dunk treats up to 100 square feet of water surface, regardless of depth. (Summit® Responsible Solutions)

Key Features

• Biological mosquito larvicide
• Contains Bti (Bacillus thuringiensis israelensis)
• Kills mosquito larvae before they become adults
• Lasts 30 days or more
• Treats up to 100 sq. ft. of water surface
• No mixing or measuring required
• Easy to use
• Suitable for many standing-water areas
• Available in 2, 6, and 20-pack options
• Approved for use in organic production (Summit® Responsible Solutions)

What Are Mosquito Dunks?

Mosquito Dunks are a simple way to control mosquito larvae in standing water.

Adult mosquitoes lay their eggs in water. The larvae then develop in that water before emerging as adult mosquitoes.

A Mosquito Dunk interrupts this life cycle.

When placed in standing water, the Dunk gradually releases Bti. Mosquito larvae consume the bacteria as they feed in the water.

The Bti then kills susceptible mosquito larvae before they can mature into flying adults. (Summit® Responsible Solutions)

How Do Mosquito Dunks Work?

Mosquito Dunks use a sustained-release biological treatment.

The Dunk floats on the surface of standing water. As it slowly breaks down, it releases Bti into the surrounding water.

Mosquito larvae consume the Bti while feeding.

The bacteria is specifically targeted at mosquito larvae. It does not function as a general insecticide for adult insects.

This makes Mosquito Dunks a useful option for controlling mosquitoes at their breeding source. (Summit® Responsible Solutions)

Where Can You Use Mosquito Dunks?

Mosquito Dunks can be used in many places where water collects and remains stagnant.

Common applications include:

• Bird baths
• Rain barrels
• Rain gutters
• Tree holes
• Garden ponds
• Water gardens
• Flower pots and saucers
• Unused swimming pools
• Animal watering troughs
• Stock tanks
• Drainage areas
• Water features
• Plant reservoirs
• Other standing-water mosquito breeding sites

Always follow the product label for approved uses in your area. (Summit® Responsible Solutions)

Mosquito Dunks for Rain Barrels

Rain barrels can provide an ideal breeding environment for mosquitoes.

A Mosquito Dunk can help control mosquito larvae while the water remains in the barrel.

The long-lasting formulation makes it convenient for water collection systems that remain filled for extended periods.

Mosquito Dunks for Bird Baths

Bird baths can collect standing water where mosquitoes may lay eggs.

Simply place an appropriately sized portion of a Mosquito Dunk in the water.

Replace it according to the product label and when the previous Dunk has been depleted.

Mosquito Dunks for Ponds and Water Gardens

Mosquito Dunks can be used in approved ponds and water gardens.

The biological Bti formulation targets mosquito larvae while being suitable for use around fish and other aquatic environments when used according to the label. Summit states that Dunks are labeled for use in fish habitats and animal watering areas. (Summit® Responsible Solutions)

Easy Monthly Mosquito Control

Mosquito Dunks are designed to be simple to use.

There is no spraying, mixing, or measuring.

Simply place the Dunk in standing water.

Each Dunk provides mosquito larval control for 30 days or more under the manufacturer’s stated conditions. (Summit® Responsible Solutions)

When the Dunk has completely disappeared, replace it as directed.

How Many Mosquito Dunks Do I Need?

Each full Mosquito Dunk treats up to 100 square feet of water surface, regardless of water depth. (Summit® Responsible Solutions)

For smaller areas, a Dunk can be broken into portions.

Coverage Guide

Water Surface Area	Approximate Amount
Up to 25 sq. ft.	1/4 Dunk
Up to 50 sq. ft.	1/2 Dunk
Up to 75 sq. ft.	3/4 Dunk
Up to 100 sq. ft.	1 Dunk

Follow the current product label for the specific application and dosage requirements.

Mosquito Dunks vs. Mosquito Bits

Both products use Bti to control mosquito larvae, but they work differently.

Dunks use a slow-release formulation designed for longer-lasting control.

Bits release Bti more quickly and are designed for situations where faster larval control is needed.

Mosquito Bits can also be used for fungus gnat larvae in soil, making them a popular choice for indoor gardeners. (Summit® Responsible Solutions)

For long-lasting treatment of standing water, Mosquito Dunks are the better choice.

Why Use Bti for Mosquito Control?

Bti is a naturally occurring bacterium used as a biological mosquito larvicide.

It targets mosquito larvae rather than adult flying insects.

Because Mosquito Dunks work in the breeding water, they help address mosquitoes before they become biting adults.

Summit describes Bti as target-specific for mosquito larvae and states that Mosquito Dunks have no effect on other flying insects such as bees. (Summit® Responsible Solutions)

Product Specifications

Brand: Summit
Product: Mosquito Dunks®
Product Type: Biological mosquito larvicide
Active Ingredient: Bacillus thuringiensis subspecies israelensis
Common Name: Bti
Form: Floating sustained-release briquet
Coverage: Up to 100 sq. ft. of water surface per Dunk
Duration: 30 days or more
Application: Standing water
Available Packs: 2, 6, and 20 Dunks (Summit® Responsible Solutions)

Active Ingredient

The current Summit SDS identifies the active ingredient as:

Bacillus thuringiensis subspecies israelensis strain BMP 144 — 10.31%

The remaining 89.69% consists of other ingredients in the formulation. (Summit® Responsible Solutions)

Ideal For

Mosquito Dunks are ideal for:

• Homeowners
• Gardeners
• Greenhouse growers
• Garden ponds
• Rain barrel owners
• Farms
• Nurseries
• Water gardens
• Properties with standing water
• Organic gardening applications

Frequently Asked Questions

What are Mosquito Dunks?

Mosquito Dunks are floating biological mosquito larvicides containing Bti.

They are placed in standing water to kill mosquito larvae.

How long do Mosquito Dunks last?

Each Dunk provides mosquito larval control for 30 days or more. Replace the Dunk when it has completely disappeared or according to the product label. (Summit® Responsible Solutions)

How much water does one Mosquito Dunk treat?

One Dunk treats up to 100 square feet of water surface, regardless of depth. (Summit® Responsible Solutions)

Do Mosquito Dunks kill adult mosquitoes?

No. Mosquito Dunks target the larval stage of mosquitoes.

They work before mosquitoes develop into flying adults.

Can Mosquito Dunks be used in ponds?

Yes. Summit lists ponds and water gardens among approved standing-water applications. Always follow the product label for your specific application. (Summit® Responsible Solutions)

Can Mosquito Dunks be used in rain barrels?

Yes. Rain barrels are specifically listed as an application site for Mosquito Dunks. (Summit® Responsible Solutions)

Are Mosquito Dunks safe around fish?

Summit states that Mosquito Dunks can be used in fish habitats and are harmless to fish when used according to the label. (Summit® Responsible Solutions)

Do Mosquito Dunks work on fungus gnats?

Mosquito Dunks are designed primarily for mosquito larvae in standing water.

For fungus gnat control, Mosquito Bits are the more appropriate Bti product because they are formulated for rapid release and soil applications. (Summit® Responsible Solutions)

Do I need to mix Mosquito Dunks with water?

No. Mosquito Dunks are ready to use.

Simply place the appropriate amount in the standing water.

Buy Mosquito Dunks in Canada

Stop mosquitoes at the breeding stage with Mosquito Dunks®.

The easy-to-use Bti formula provides long-lasting biological control of mosquito larvae in standing water.

Controls Fungus Gnat Larvae

Mosquito Dunks can also help control fungus gnat larvae in suitable applications.

The active ingredient, Bacillus thuringiensis subspecies israelensis (Bti), targets the larval stage of fungus gnats when they consume the treated material.

This makes Bti a useful biological option for gardeners and indoor growers dealing with fungus gnat larvae in growing media.

For fungus gnat applications, break a Mosquito Dunk into smaller pieces and use it according to the product label and manufacturer’s directions.

Mosquito Dunks for Fungus Gnats

Fungus gnats can become a common problem in moist growing media, particularly around indoor plants, seedlings, clones, and greenhouse crops.

The larvae live in the growing medium and feed around the root zone.

Using a Bti-based product can help reduce fungus gnat larvae as part of an integrated pest-management program.

Important: Mosquito Dunks target fungus gnat larvae, not adult fungus gnats. For best results, combine larval control with practices that reduce excessive moisture and other conditions that encourage fungus gnats.

Do Mosquito Dunks control fungus gnats?

Yes. The Bti active ingredient in Mosquito Dunks can control fungus gnat larvae when used appropriately. The product does not control adult fungus gnats.

Are Mosquito Dunks good for indoor plants?

They can be useful for controlling fungus gnat larvae around indoor plants when used according to the product directions. Allowing growing media to dry appropriately between watering can also help reduce fungus gnat breeding.

Shop Mosquito Dunks from Jon’s Plant Factory for use around gardens, rain barrels, ponds, bird baths, and other approved standing-water areas.

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