For areas where standing water cannot be reduced or eliminated, biological larvicide control is available. Mosquito Bits
and Mosquito Dunks
contain Bacillus thuringiensis
) bacteria that feed on mosquito larvae. They can be used anywhere that you find standing water including flower pots, roof gutters, old tires, and ponds.
are small granules containing the Bti bacteria that are spread on the water surface. The larvicide granules gradually settle in the water where they are eaten by mosquito larvae. Mosquito Bits will give a quick kill, usually within 24 hours. The recommended application rates are one teaspoon for 25 square feet or one tablespoon for 75 square feet, regardless of the water depth. A seven to fourteen day interval between applications is recommended. For longer term control, Mosquito Dunks can be used after applying Mosquito Bits.
are 2 inches in diameter and 1/2 inch thick, with a small hole in the center. They contain the same larvicide as the Mosquito Bits. The Dunks float on top of the water and will be effective for approximately 30 days. While floating, they slowly release the larvicide that settles in the water where it is eaten by mosquito larvae. Alternate wetting and drying will not reduce their effectiveness. The center hole can be used to anchor the dunks in place with a string or stake. Recommended application rates are 1/4 dunk for 1-5 square feet of water surface area and one dunk for 25-100 square feet of water surface area.
Note: Mosquito Bits and Mosquito Dunks should not be applied to treated, finished water which will be used for drinking.
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