Mosquito Dunks - Kills Mosquitoes Before They're Old Enough To Bite!
For
 ORGANIC production and gardening. Biological mosquito control. Each 
Dunk kills mosquito larvae for 30 days or more. Can be used in Fish 
Habitats.A Mosquito Dunk® looks like a small, beige donut which floats 
on standing water. As the Dunk® slowly dissolves, it releases a 
bacterium which is toxic to all species of mosquito larvae.
Place
 in containerized standing water wherever it accumulates near the 
household: flower pots, tree holes, bird baths, roof gutters, rain 
barrels, old tires, unused swimming pools, animal watering troughs. A 
safe, nontoxic way to control mosquitoes before they become flying, 
biting, disease-carrying adults.
    Each dunk kills mosquito larvae for 30 days or more
    Approved for use in organic production
    Each dunk covers up to 100 square feet of water, regardless of depth for 30 days or more
    Use
 Mosquito Dunks in any standing water including rain barrels, bird 
baths, tree holes, elevator shafts, planter reservoirs, rain gutters, 
etc