It’s a Bee…It’s a Fly… It’s Stomach Bots!

Horse Bot Fly (Gasterophilus intestinalis)

The horse bot fly or stomach bot is an internal parasite of the horse’s gastrointestinal tract. Geographical location influences seasonality of bot flies. In north Florida, the flies are more active in late spring through early winter. Horses are the most common host for this pest; however, mules and donkeys can be infected as well.

Bot eggs on the front leg. Photo provided by Courtney Darling.

The adult bot fly itself causes minimal damage by simply annoying the horse. More seriously, the horse may experience indirect damage from being severely spooked or a lack of appetite if annoyance is great enough. Direct damage caused by this species occurs when it is in the larvae stage. Larvae burrowing into the mouth of the horse could result in infected pockets or loosened teeth.

The female lays her eggs on the horse’s hairs. Eggs can be found on front legs (most common), abdomen, flanks, and shoulders. As the larvae age and make their way through the horse’s gastrointestinal tract blockages can cause colic. Large larvae populations will damage the stomach tissue and gut. Larvae will steal necessary nutrients from the horse. The figure below describes the life cycle of a bot fly.

Cultural and Mechanical Control
  • Remove feces away from the horse so it does not reinfect itself when eating
  • Remove the eggs from the horse’s hair with a sharp-edged tool or sandpaper block
Bot Block. Photo provided Courtney Darling
Bot knife. Photo provided by Courtney Darling.
Dewormers
  • Ivermectin
  • Moxdectin

Remember to always follow label instructions when administering any chemical treatment. Work with your veterinarian or local county extension agent to develop a deworming protocol best suited for your farm.

UF/IFAS is an equal opportunity institute.

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Posted: February 23, 2021


Category: Agriculture, Livestock, Pests & Disease, UF/IFAS Extension
Tags: Bot Fly, Horses. Internal Parasites, Stomach Bots, Topic Tuesday, UF/IFAS Extension Suwannee County


Comments:

Courtney Darling

March 29, 2021

Thank you Toni For your comment!

Courtney Darling

March 29, 2021

Thank you Sherry for your comment!

Sherry Kunze
March 27, 2021

Great article, very well written. Love all the information, along with how to take care of the problem. A lot of people don’t understand the importance of removing those pesky little yellow dots, this article should open a lot of eyes as to why it is so important !! Thanks for the work you put into it, hope to see more on many different subjects

Donna Torrey
February 5, 2021

As a registered beekeeper in South Florida, I really appreciated this article. We all need to be aware of our wonderful native bees and not get all bees confused with honeybees. Thank you!

Toni
January 31, 2021

Very interesting. I like learning from these articles

Sylvia Willis

November 3, 2020

Thank you Rosanna for your comment. You are correct! Organocide Bee Safe 3-in-1 Garden Spray is an organic spray recommended by UF/IFAS to help control Spider Mites in field, greenhouse, and nursery strawberry production. Here is a link if interested in other organic spray options for spider mites: https://edis.ifas.ufl.edu/in486.

Rosanna Lewis
November 3, 2020

Organocide Bee Safe 3-in-1 Garden Spray can control spider mites. It's a safe pesticide made of food grade oils that suffocate small soft bodied insects in all stages of their lives. Great alternative to harsh chemicals as it is OMRI listed and safe to pollinators.

Courtney Darling

August 10, 2020

Hello Tammy, This product has interior areas of the home on the label and is a general insecticide that controls many insects, including chicken mites, on contact. Here is the link to label: https://www.domyown.com/msds/PyGanic_Pro_Specimen_Label.pdf

Tammy Riebe
August 10, 2020

Hi Courtney this is Tammy I would like to know if you know any more about chicken mites what is a good thing to spray I’m side of our house? Thank you ,

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December 9, 2019

That is an excellent point. In that case, the plant will likely be dried and pressed as a sample in a botany collection and used for research, so it is likely that the entire plant will be needed.

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Like the thought of helping with plant ID, but would discourage from advising the plant be dug up to ID. Sometimes necessary I'm sure, but shouldn't be a standard, what if plant is rare or endangered?

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October 5, 2018

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Most motorists don't know how to deal with slow moving farm equipment on the road so thanks for sharing this info.

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De Broughton

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I'm so sorry to hear of your loss. Hopefully you're remarks here along with this blog will generate some awareness on road safety and all motorists.

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I lost a close friend of mine who was driving at night and hit a tractor that was parked half way in the middle of the road. I appreciate you sharing these safety tips.

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Hi, Nice review. I think that an important aspect ofnprecision agriculture is being overlooked, and that is - decision support tools. I call it ‘the missing link’: https://cropaia.com/blog/precision-agriculture-missing-link/

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