Get a death grip on flies where they love to breed and feed — horse barns and kennels — with the help of natural insects that eat them called Fly Predators. These tiny insects are harmless to animal life and feed on the fly’s pupa (cocoon) stage of development. They do not attack the adult pest flies. Thus, the adult flies currently existing must either be removed by supplemental methods or tolerated until they live out their short life span of about 21 days.
During fly season, you must repopulate fly infested areas every 30 days with a new supply of recruits that will be mailed directly to you from Spalding Fly Predators. From the website, read all recommendations carefully on how to handle your fresh supply of these little exterminators. You want them to be alive and hungry when you release them!
The author has successfully used and recommends Spalding Laboratories for their excellent customer support.