Springtime INC's Garlic for horses
I am using garlic this year to see if it really does help with fly control, and am amazed at the results. It won't keep all flies off, but my horses are significantly less bothered by flies and mosquitoes than the other horses at the stable. I have a paint with a blaze face, and he is swishing his tail much less than his buddies, in fact the other horses gravitate to my horses in what seems an attempt to rid themselves of the flies. No pesticides, and an added health bonus!