I dislike bot flies, actually I loathe them. Small invading terrorists whose only pleasure in life is to disturb my peace!
In the past I have dealt with them doing what the SPS calls the "Bot Fly Boogie", no it has nothing to do with he of the spotty butt (however they could all bug him and I wuldn't care). I trot around and around in circles until the fly is to dizzy to keep up with me anymore. This has been a good tactic but with my lady love Little Sister needing me close it is one I am trying to avoid. So this year I have tried playing dead. Turns out the little pests don't care if you are a dead horse or not. I have tried rolling. The persistent creatures just wait for me to stop. So I am back to the bot fly boogie. I just try not to stray too far from my lady so she doesn't worry. The things a royal horse does for love.
Tu ne cede malis sed contra audentior ito (Yield not to misfortunes, but advance all the more boldly against them)