I have been buying Bt donuts for years. We have two small ponds and a dry-creek that will puddle here and there. When we first bought our property we were constantly getting swarmed by mosquitoes. There was a noticeable difference after we started to use the Bt with no ill effect to the frogs. They're alive and croaking. Well worth the investment!
Reviewed by AccomplishMoreToday on 3/12/12