Bluefield Daily Telegraph, Bluefield, WV

Pet Talk

June 4, 2012

House flies are more than an airborne pest

CHARLOTTESVILLE, Va. — If you are around horses or a stable lately, you may notice an increase in flies such as stable flies, house flies, horn flies, and horse flies.

Dr. Leslie Easterwood, clinical assistant professor for the large animal clinical sciences department at Texas A&M University College of Veterinary Medicine & Biomedical Sciences, said flies are worse in the summertime and this year they are particularly bad.

“Last year it was dry and hot so it didn’t seem quite as bad, but this year we’ve had rain and the temperatures haven’t been as high so there seems to be an increase,” Easterwood said.

Flies can be a nuisance to a horse because the horse tries to swat and get away from them. Other than annoying the horse, the biting flies can cause physical irritations.

Often, the flies congregate around the horse’s face trying drink the fluid at the corner of the horse’s eyes. Since flies carry bacteria on their feet, when they are looking for moisture they deposit bacteria, larvae, and parasites on the horse’s face and around the eyes.

“The biggest thing is the transfer [of bacteria] and all flies can be bothersome,” Easterwood said.

Flies often deposit Habronema larvae on open wounds and the horse’s eyes.

“As the larvae migrate through the tissue, they cause open sores and that is very common in horses this time of year,” Easterwood said.

Horse flies are even worse than normal house and stable flies. Easterwood said these flies are at least 10 times the size of a house fly, have big mouths, and transfer more diseases than a house or stable fly.

“They can transfer diseases such Equine Infectious Anemia, a very fatal disease that we don’t have a cure for,” she said.

Easterwood said these irritations, sores, diseases, and transfer of bacteria are the main reason it is important to have proper fly control.

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