Summit® MOSQUITO DUNK CHUNKS® Kill mosquito larvae with convenient toss of a chunk in small areas of standing water. 

Mosquito Dunk Chunks® are small, wedge shaped chunks that float when placed in standing water. As it slowly dissolves over 30 days, each Chunk® releases a bacterium which is toxic to all species of mosquito larvae. 

The active ingredient is Bacillus thuringiensis subspecies israelensis (Bti). Bti is deadly to mosquito larvae but harmless to other living things. Simply place a biodegradable Mosquito Dunk Chunk® in koi ponds, birdbaths, rain barrels, or any place where water collects and remains for periods of time. Ideal for water reservoirs in self watering planters, in saucers of large patio pots, gutters and drainage ditches - any place where water pools and stays for longer than 4 days. 

While floating, the Chunk® slowly releases a long-term biological mosquito larvicide at the water’s surface. This larvicide gradually settles in the water, and while it travels through the water it is eaten by the mosquito larvae growing there. When female mosquitoes lay their eggs in standing water treated with a Mosquito Dunk Chunk, the larvae will hatch and begin to eat the Bti. The Bti will kill the mosquito larvae before they can grow up to become biting and disease-spreading adults. 

Each Mosquito Dunk Chunks -5 ct 

Mosquito Dunk Chunk® will effectively treat 25 square feet of surface water for at least 30 days.

• No mixing or measuring - simply toss! 
• Each Chunk® covers up to 25 square feet of water, regardless of depth for 30 days. 
• Convenient to use in bird baths, rain barrels, stock tanks - in any standing water 
• Does not affect beneficial insects, honeybees, tadpoles, dragonflies, or anything else. 
• Convenient for bird baths, rain barrels, stock tanks –Chunk® covers up to 25 sq ft 
• 5 Chunks® per pack controls for 5 months or more (30+ days per chunk) 
• No mixing or measuring – simply toss 
• Completely harmless to people, plants, and pets 
• Biological, species specific control 
• Does not affect beneficial insects, honeybees, tadpoles, dragonflies, or anything else