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.
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
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.
Comments:
March 29, 2021
Thank you Toni For your comment!
March 29, 2021
Thank you Sherry for your comment!
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
February 5, 2021
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January 31, 2021
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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.
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.
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
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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 ,
December 9, 2019
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July 24, 2019
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October 5, 2018
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October 5, 2018
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October 5, 2018
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February 4, 2018
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January 31, 2018
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January 31, 2018
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January 31, 2018
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January 30, 2018
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January 30, 2018
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