Mosquito Dunks give longer control, keeping larvae in check for 30 days or more as they slowly release their Bti, while Mosquito Bits give a faster kill, releasing all of their Bti at once and killing existing larvae within 24 hours. Dunks are used for steady coverage of standing water, and Bits for clearing larvae that are already active.

What do Mosquito Dunks and Mosquito Bits have in common?

Both are biological larvicides built on Bti, short for Bacillus thuringiensis israelensis. The larvae take in the Bti from the water as they feed and die soon after, so both products stop mosquitoes before they become biting adults.

Which kills larvae faster, Mosquito Dunks or Mosquito Bits?

The Mosquito Bits Biological Mosquito Larvicide works faster, because all of its Bti is released the moment it is applied. Sprinkled or broadcast over water where larvae are already active, it gives a quick kill within 24 hours.

Where can Mosquito Dunks and Mosquito Bits be used?

Both work in birdbaths, ponds, and animal watering troughs. The slow release dunks are also listed for rain barrels, gutters, and water filled tree holes, while the Bits can also be used in soil, where a tea made from them kills fungus gnat larvae.

Which lasts longer, Mosquito Dunks or Mosquito Bits?

Staying power belongs to the Mosquito Dunks, which release their Bti gradually as each dunk dissolves and control larvae for 30 days or more across up to 100 square feet of surface water. The Bits, by contrast, are reapplied every 7 to 14 days.

Frequently Asked Questions

Can Mosquito Dunks and Mosquito Bits be used together?

Neither product page says so. Bits are made for a quick kill of larvae already present and Dunks for longer control, so any combined schedule is best confirmed on the labels.

Does either one kill adult mosquitoes?

No. Both work on larvae in the water rather than on flying adults.

Does water depth matter?

Not for the dunks. Each dunk treats up to 100 square feet of surface regardless of depth, while the Bits page does not address depth.

Are both safe where pets drink?

Yes. Both are described as harmless to pets, birds, and fish, and the Bits are labeled for water where animals and pets drink and bathe.