I don't have any standing water, Elaine. I do have a large rain-tub that I use those dunks in. What I do have are over 100 bromeliads that retain water. That's how they live. I also have chiggers (red bugs) in my yard. Why, I don't know. I was hoping for something that would rid my yard/landscape of noxious insects without a residual affect. Perhaps that doesn't exist. I wonder if these lawn businesses who spray for mosquitoes and guarantee there will be no mosquitoes for 30 days, kill all beneficial insects for those 30 days as well.