This is effective for mosquitoes for two reasons First, because they lay eggs in standing water. Second, because mosquitos are relatively weak flyers compared

This is effective for mosquitoes for two reasons First, because they lay eggs in standing water. Second, because mosquitos are relatively weak flyers compared to other flies. They often only travel a few hundred yards from where they were born during their lifetime. So removing standing water is an excellent way to keep mosquitos at bay. If you can't, applying BTI spores to the standing water can target their larva.