Due to unforeseen bot traffic on this item, Mosquito Dunks are only available for shipping via bundles. They will also be available to shop in person at Geist Nursery during our seasonal sales.

A non-toxic water treatment that kills mosquito and black fly larvae by releasing a bacteria (Bacillus thuringiensis israelensis, or Bti) that prompts the larvae to stop eating. Larvae take 2-3 days to die after application.

Dunks should be reapplied every 30 days at least, more often if the body of water flows over.
How much dunk to use by water surface area:
1-5sqft = 1/4 dunk
5-25sqft = 1/2 dunk
25-100sqft = 3/4 dunk
100+sqft = 1 dunk per 100sqft