Bti is a naturally occurring toxin produced by the bacterium Bacillus thuringiensis israelensis. The dunks work by killing mosquitos in their larval stage. The larvae eat the Bti spores, which release a toxin into their guts and causes them to stop feeding. Bti is not toxic to humans or other mammals, birds, or fish. Therefore, it is safe to use in water sources that do not drain off your property, such as rain barrels or ornamental ponds. Doug Tallamy suggests a method of using Bti dunks to create a trap to reduce local mosquito abundance since most species of mosquitos travel less than one half mile from where they breed: Place water in bucket with straw and let it ferment for about 4-5 days; the larvae feed on the algae and microorganisms that grow on the straw, so this entices female mosquitos to lay their eggs in the bucket. Wait one week then add a dunk. Because Bti only kills aquatic fly larvae, you can safely dispose of the water by dumping it onto your lawn.
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Wallingford PA 19086-0330