Bot flies lay their legs in late summer on the legs of animals (especially horses). The eggs make the animals itch, they lick their leg for relief and into their system the bot eggs go.
Their larvae grow in the digestive system of the animal when they are passed through the bowels into their stool. Along the way they strip the animal of nutrients & can cause other damage like ulcers.
First and foremost using fly spray helps to prevent bot flies from even landing. Second, this quick video provides tips for recognizing and removing the eggs once they’ve been laid.
Thanks to the folks over at Equestrian Life for providing so many quick, informative videos.
Fly spray is an important addition to any tack room, but remember that it’s poison. Where you can, choose organic, earth friendly options, your horse (& Mother Earth) will thank you.