A safe, effective way to control mosquitoes in your water garden is to float Bt "doughnuts", also called mosquito dunks in the pool or pond. These small briquettes contain Bacillus thuringiensis israeliensis, a bacterial insecticide that kills mosquito larvae, but won't harm people, plants, or animals. Each briquette treats 100 square feet of water and lasts 30 days.
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