Two types of mosquito larvae control work in ponds: slow release dunks, which give longer protection, and fast acting granules, which give a quicker kill. Both use Bti, a microbial larvicide that targets the larval stage rather than flying adults, so the choice comes down to speed versus how long protection lasts.

Why does larvae control work in a pond?

Because mosquito larvae live in standing water, and treating that water stops them before they become biting adults. Both product types rely on Bti, short for Bacillus thuringiensis israelensis, which the larvae take in as they feed and which kills them soon after.

How do mosquito dunks and granules differ?

Mainly in speed and staying power. A dunk releases its Bti gradually and keeps controlling larvae for 30 days or more, while granules release all of their Bti at once for a quick kill within 24 hours and need reapplying every 7 to 14 days.

When is each type used in a pond?

Dunks give steady, month long coverage, and granules give a fast kill of larvae already present. Adding one of the Mosquito Dunks for every 100 square feet of pond surface keeps the whole pond treated for a month at a time, while Mosquito Bits Biological Mosquito Larvicide broadcast over the water kills the larvae that are already hatching.

Frequently Asked Questions

Are both types safe for fish in a pond?

Yes. The dunks are described as harmless to fish, birds, frogs, and turtles, and the granules as harmless to fish, birds, pets, and livestock.

Does pond depth change how many dunks are needed?

No. Each dunk treats up to 100 square feet of surface water, regardless of depth.

Can the granules go in water that pets drink from?

Yes. The granules are labeled for ponds, birdbaths, and animal watering troughs where animals and pets drink and bathe.

Can a general mosquito spray be used on a pond?

Only if its label covers standing water. Some mosquito sprays are made for lawns, trees, and shrubs rather than ponds.