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Flies and Mosquitoes are Harmful to Horses!
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Flies and Mosquitoes are Harmful to Horses!

By Ann Pruitt · Fly-control

Looking for real-world horse-industry insight on flies and mosquitoes are harmful to horses?

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Flies and Mosquitoesare Harmful to Horses!

Shoo- Fly

Flies and mosquitoes are disease carriers and must be controlled.

The dangerous bacteria present in the wastes stuck to the mouth, footpads and hairs of flies may be deposited in food intended for livestock consumption. Fly feces, which contain disease-bearing organisms, can also contaminate livestock feed. One fly can carry over 33 million disease-causing microorganisms on their inner and outer body surfaces. Flies defecate every four to five minutes. Since flies have no teeth and must take their nourishment in liquid form, they spit on solid food and let the food dissolve before consuming it. Fly spit or vomitus, is loaded with bacteria and contaminates food, feed and surfaces.

Flies have been known to carry bacteria that can cause typhoid fever, tuberculosis and many other diseases known and unknown to man. A flies common life cycle is 21 to 25 days from egg to adult. A female often lays twenty batches of eggs during her thirty day life span. Each batch contains between 40-80 eggs. When the eggs hatch, the adult flies emerge ready to breed. The number of flies produced by a single pair of adults and their offspring in thirty days is a surprising number in the millions.

Stable flies, horseflies, deerflies, horn flies, and face flies affect your horse’s health and well-being. Stable flies, are very common. They are about the same size as a house fly but house flies just feed on garbage and spread filth; stable flies (both males and females) suck your horse's blood. The most common feeding sites include horse’s lower legs, flanks, belly, under the jaw, and at the junction of the neck and the chest. When stable flies are finished feeding, they go to rest and digest their meal.

The bite of a blood-sucking fly is painful and some horses have such a low fly tolerance for pain that they can start snorting and striking into a frenzy. Even the toughest horses that are subjected to a large number of stable flies, might spend the day stomping their legs which can cause damaging to legs, joints, and hooves, and result in loose shoes, and loss of weight and condition. The first step in reducing fly populations is keeping the area clean. Fly’s breed in decaying waste. Moist, warm, decaying material protected from sunlight is required for fly eggs to hatch and in only 8 hours for fly larvae or maggots to grow. Good manure management and moisture control are the biggest factors that reduce flies from breeding. The practice of removing manure and wasted feed daily from stalls and pens is the key.

To successfully decrease insect breeding areas, kill parasite eggs and larvae, manure must be taken care of effectively.

Standing water is very attractive to flies and mosquitoes. It is a good idea to keep stagnant water away from your horse’s living quarters. Water left in buckets, on the ground and under faucets are a few examples of where to prevent water from collecting. Keeping your stable clean and dry prevents flies and mosquitos from wanting to make your property their home. Good air ventilation is very important for keeping your barn dry and uninviting to flies. Flies usually have favorite resting place. They commonly rest on edges such as electric wires, exposed ceilings and rafters. Flies especially like places that protect them from the wind.

Another way to reduce fly breeding is to keep food off the ground so that it can not become moist. Feeding your horse grain and hay from a feeder rather than eating from the ground is best. This keeps flies from laying eggs in the feed and the horse from digesting the bot eggs. Keep food/feed stored in sealed containers when possible and clean any spilled hay or grain immediately. Scrubbing feed buckets after use will help prevent flies from hanging around and making your stable their home.

One of the oldest ways to control flies is through the use of insecticides or fly sprays. This type of control method requires some form of application device. Insecticide fly sprays can be applied in many ways; trigger spray bottles, aerosols, hand held foggers, or automatic insect control systems. Automatic insect control systems are very effective and efficient, with use in stables dating back to the early 70’s.

Shoo-Fly Insecticides Are Biodegradable –Safe For All Humans & Animals! Shoo-Fly has over forty years experience with insecticides and the control of insects. Our insecticides are not harmful to you, your employees, your animals, or the environment when used as directed.

Shoo-Fly's specially formulated water-based insecticides are biodegradable , and are approved for use around humans and all other warm blooded animals. They may be used in food processing facilities, bakeries, bottling plants, canneries, flour mills, hospitals, hotels, restaurants, schools and barns. We meet every strict requirement of the Environmental Protection Agency. The U.S.D.A. has authorized the use of our insecticides in all areas of official establishments operating under the Federal meat, poultry, shell, egg grading, and egg products inspection programs.

Unlike the so-called beneficial insects, or fly predators, which attack only the house fly pupa, our superb insecticides knock down and kill flying insects quickly... and they stay down. Their breeding cycle is effectively interrupted and the insects are unable to develop immunity to our insecticide formula. It may be applied directly to animals for outdoor control.

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Key Article Takeaways
  • Keeping your stable clean and dry prevents flies and mosquitos from wanting to make your property their home.
  • Feeding your horse grain and hay from a feeder rather than eating from the ground is best.
  • Keep food/feed stored in sealed containers when possible and clean any spilled hay or grain immediately.
  • One fly can carry over 33 million disease-causing microorganisms on their inner and outer body surfaces.
  • A flies common life cycle is 21 to 25 days from egg to adult.
Questions readers commonly ask:
How dangerous are flies really for horses and barn hygiene?

Per Shoo-Fly: one fly can carry over 33 million disease-causing microorganisms on its body surfaces. Flies have no teeth — they spit on solid food and let it dissolve before consuming. Their spit and vomit are loaded with bacteria. They defecate every 4-5 minutes, contaminating feed, water, and surfaces. The cumulative microbial load in a fly-infested barn is enormous.

What diseases do flies carry?

Per Shoo-Fly: typhoid fever, tuberculosis, and many other diseases known and unknown to man. Among horse-specific issues: anthrax, salmonella, anaplasmosis, contact dermatitis, and bacterial conjunctivitis. The bacteria are deposited in food, water, and on the horse's skin and eyes. Even healthy horses can develop secondary infections from chronic fly exposure.

What's the lifecycle of a fly and how does that affect control strategy?

Per Shoo-Fly: typical fly lifecycle is 21-25 days from egg to adult. Females lay eggs in moist organic matter (manure, decomposing feed, wet bedding). Larvae develop over 4-7 days. Adults emerge and reproduce within days. Effective control breaks the lifecycle: remove breeding sites (manure, wet bedding) AND kill emerging adults. Single-method approaches fail because the population continually regenerates.

Why are mosquitoes such a serious threat to horses?

Per Shoo-Fly: mosquitoes transmit Eastern Equine Encephalomyelitis (EEE, 90% mortality), Western Equine Encephalomyelitis (30-50% mortality), and West Nile Virus (30-50% mortality). Vaccinations exist for these diseases and should be current for every horse. Even with vaccination, reducing mosquito exposure reduces disease risk. Mosquito-bite stress also affects horse comfort and behavior.

How does an automatic fly + mosquito control system work?

Per Shoo-Fly: timed misters distribute insecticide formulations through pipes routed through the barn structure. Multiple nozzles deliver controlled spray on a programmable schedule. Most effective during dawn and dusk fly/mosquito peak activity. Once installed, the system runs automatically without manual intervention. Refill the reservoir periodically; service nozzles annually.

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Ann Pruitt
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