Pyrahna spray is my favorite, we're having pretty bad flies already in the day, and horrible Mosquitos during the evening, and it's worked for keeping both off.
I rinse my horses (weather permitting) if they are sweaty because it seems to attract flies.
In the summer I use a sunscreen/fly control combo for faces and muzzles, it's a lotion and is really easy to apply to ears, around eyes, muzzles, ect.
I hang those sticky fly strips in the barn too, high enough that they don't get eaten or tangled in a mane.
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