Home Health & Care Beat the Bots: How to Get Rid of Botflies

Beat the Bots: How to Get Rid of Botflies

Ellie Fraser | August 15, 2011 |

fly-control1-300x225If you’re a horse owner, Spring and Summer are probably your favorite seasons. However, with warmer weather comes bot flies, and every horse owner knows these pests can cause trouble! But what kind of trouble, exactly?

A basic overview of bots goes like this:

1. Bot flies lay their small, yellow eggs on the horses legs and undersides in summer.

2. The horses legs and underside feel itchy, so the horse will nuzzle and lick at the eggs, ingesting them. (Larvae that is not ingested can also hatch and crawl inside the skin, causing irritation and in some cases, infection.)

3. Next spring, the eggs will have turned into larvae, and will be passed through in manure – but not before robbing your horse of essential nutrients. Bot larvae can also cause stomach ulcers and, in serious cases, colic.

Female equine botflies must reach a horse to procreate, so nothing short of death will stop her from getting there. This is extremely frustrating for the horse, which is why the first sign you will often receive of a botfly buzzing around will be your horse stamping his feet, swishing his tail, and perhaps becoming slightly agitated.

So what do you do?

The golden rule of horsemanship – prevention is better than cure! While you will never completely prevent bot flies from laying on your horse, there are ways to lessen the risk.

  • Use an equine insect spray. These generally deter most insects that bug your horse, especially during summer, and are a good base to start from. Keep in mind that horse sweat will dilute insecticides and sprays, so spraying your horse daily is the minimum requirement.
  • Use a fly sheet. While the bots lay their eggs predominantly on the legs of the horse, a fly sheet will lessen the likelihood of them laying on your horses underbelly.
  • Use a pair of fly boots or socks on your horse. There are several of these available on the market, such as Summer Whinnys.
  • A common household remedy is to coat your horses legs in baby oil, making it difficult for the flies and eggs to grip to your horses coat. This isn’t a surefire prevention though, and doesn’t deter anything – in fact, it will attract a lot of dirt and dust to your previously clean horse!

Remove the eggs daily – this will lessen the chance of your horse ingesting them.

  • Warm water with some insecticide in it can encourage the eggs to detach and hatch, while the insecticide kills the larvae.
  • Bot knives are cheap, easy to use, and effective. Bot eggs are almost impossible to remove with simply your fingers, and a bot knife is a safe way of removing them without hurting your horse.
  • Household remedies include using sandpaper and cheap razors to remove the eggs, but these methods can be painful and dangerous to both you and your horse if not used correctly and carefully.

Finally, ensure your horses worming schedule is up to date.

  • Your horse should be wormed in the Autumn/Spring months, about one month after the bot fly season has ended, with a worming paste that includes Ivermectin. This will ensure the larvae is killed in the early stages of its cycle.
  • However, if you worm your horse later than one month after the botfly season has ended, look for a worming medication with Moxidectin – this is most effective against the later stages of common bot fly larvae, however, is not effective against all species of horse bots.

Above all, bot flies require persistence and daily management. Taking a few minutes out of your day to rid your horse of these pesky pests will save your horse and your wallet a lot of misery!

Photo credit: http://sxc.hu


About the Author

Ellie is an Australian university student studying Public Relations & Organisational Communication. Her horse, Felix, has been stealing her carrot cake for 11 years, & when she’s not pampering him, she can be found eating sushi, vaulting, or trying to plan the unplannable. You can get to know Ellie here.


  1. Hi Ellie

    Thanks for your article. I have just done a worm count on my horses manure (after doing a course) and have found no eggs (strongyle/ascarid or anything else for that matter). He does however have bot eggs on him and I presume he will have ingested them. Do you know if there a single worm paste (boticide) that I can use just on the bots?

    Kind regards


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