Doe s anything repel them? I am not talking all day. I just need something that works for 10 or 15 minutes while I lunge the horse. What about the mesh covers that the horse wears over its hind end like a quarter sheet? They are not getting on her head as much as they are attacking from behind.
I tried the U of Florida deer fly trap. I painted a flower pot blue, covered it in Tanglefoot, mounted it on a long stick and attached it onto the back of my tractor. The movement and color blue is supposed to attract deerflies and they stick to the Tanglefoot when they swarm in to feed. Well I guess Alabama deerflies are smarter than Florida deerflies because none of them appeared and I guess they can distinguish between a horse and a tractor. When I take the horse into the arena in a matter of minutes I have more than a dozen swarming her. I will try this method and attach it to a riding mower to see if the smaller vehicle fools them.