What Months Are Horse Flies Active? (Perfect answer)

Only the female horse fly drinks blood, and the flies tend to be most active during the months of July and August; this is because the females of the species need blood from a vertebrae animal to give birth.

  • Horseflies are most active in hot weather, mostly in summer and autumn during the daylight hours. Most species also prefer a wet environment, which makes it easier for them to breed. Eggs are generally laid on stones close to water or on plant stems or leaves.

What month do horse flies go away?

By early August, the deerflies and horseflies begin to die off for the year, but a few of them wait until then to emerge. Just when some people begin to think they’re gone, some of the largest and ugliest of the horseflies emerge. Fortunately, there aren’t as many of them.

How long is horse fly season?

When mature, the larvae move to dry areas near the surface of the soil to pupate for 1 to 4 weeks. Most flies emerge sometime from May through August. Some species of horse flies have two generations per year in coastal Georgia. Most species of horse flies and deer flies have a 1-year life cycle.

Are horse flies seasonal?

Horse flies and deer flies are both in the insect family Tabanidae and are serious pests to cattle, horses, and humans. They become active when the weather gets warm and continue to persist throughout the summer and into fall.

Are horse flies around all year?

Horsefly season is firmly upon us as the weather has turned hot and humid. The insects, also known as clegs, return each year to cause havoc among livestock and humans.

How do you keep horse flies from biting you?

Here are a few things you can try no your next trail run to help avoid horse-fly bites.

  1. Bug Spray – Picaridin has been said to effectively ward off horse-flies.
  2. Some say horse-flies are attracted to blue for some reason.
  3. Wearing a buff or/and hat on your neck and head will help keep them off your skin.

What time of day is best to avoid horseflies?

Horseflies are here to stay until the weather cools off. In the meantime, try to avoid them–they prefer wooded, wet areas, like creeks and ponds, and are most active during the hottest part of the day.

Do horse flies go away at night?

Horse flies do not only prefer the outdoors (especially near pools of water, like mosquitoes). They also prefer sunlight, are most prevalent in the summer months, and tend to avoid dark, shady areas. Horse flies do not come out at night. Adult Horse flies feed primarily on nectar and plant excretions.

Are horse flies active at night?

Horse flies are active during the day; they can’t find their hosts at night.

What attracts horsefly?

They attack large mammals, such as humans, dogs, and, of course, horses. They’re most attracted to moving objects and dark objects. They’re also attracted to carbon dioxide. This may explain why all of those outdoor summer activities that get you sweating and breathing heavy seem to bring out the horseflies.

Does DEET repel horse flies?

A fact sheet written by Lee Townsend, extension entomologist University of Kentucky College of Agriculture, states that manmade chemical repellents such as DEET “can provide several hours of protection” from deer flies and horse flies.

Can horse flies bite through clothes?

‘Horsefly females have such strong, powerful mouthparts that they can sometimes bite you through your clothes,’ he says. ‘But obviously they are more likely to go for bare skin. ‘ It’s probably best to opt for loose-fitting clothing.

Why are there so many horse flies this year?

Widespread flooding and an overall abundance of available water has made conditions perfect for these flies. In general, the parasitic flies that affect pastured livestock are dung-breeding insects (e.g., horn flies and face flies).

Why do horseflies chase you?

Horseflies bite to ingest blood which is rich in protein. The protein is needed to develop their fertilized eggs. And yes, horseflies will chase you down to get their meal.

How fast do horse flies fly?

There are other insects that fly faster, but their air speeds have not yet been accurately measured. For example, though not proven, dragonflies have been said to fly at 60 mph and horse flies at 90 mph!

Where do horse flies nest?

Horse fly development sites are freshwater and saltwater marshes and streams, moist forest soils and even moist decomposing wood. Females usually deposit egg masses on wet soil or vegetation that overhangs water. Larvae are active in moist or wet organic matter and look similar to house fly maggots.

Horse Flies

Which horse breeds are the quickest in the planet? Breeds are produced and trained for diverse reasons in numerous industries, including sports, agriculture, entertainment, warfare, and therapy. There are approximately 300 breeds in existence that are bred and trained for various purposes across multiple fields. But despite the large number of different types of horses available, only a small number of them are speedier across short and long distances. Here is a look at the top five fastest horse breeds in the world, as well as the sports in which they do very well.

Because of their slender and tall body form, they are swift, nimble, and powerful when given the correct care and training.

In practically all speed competitions, ranging from barrel racing to three-day eventing, they’re employed.

Speed, flexibility, and adaptability are all characteristics associated with this breed.

  • This breed is special in that it can learn and adapt to diverse temperaments from individuals.
  • Arabian They are not the quickest horses, but their endurance level distinguishes them from other breeds and allows them to continue longer in races.
  • The ability to outwit their riders/owners is one of the reasons they are praised for their intelligence.
  • Because of their affable disposition, they are sometimes described to as a man’s best friend, and many of them go on to become wonderful companions for amateur riders when their harness racing careers are through.
  • They are also competent in other sports.
  • Because of its bright coat, it distinguishes itself from other breeds, and they are renowned for their intelligence and ability to learn quickly.
  • Check out these more quick horse breeds: Breed Profile for the Zangersheide – Zang Horse After a lifetime, you leave a legacy.
  • Were you watching a horse racing and saw Winning Brew clocking the fastest time of the day?
  • Perhaps it is more accurate to say that the world’s fastest horse is also the one that serves as the lifeblood of the whole Thoroughbred breed.
  • Everyone who has made a name for themselves in horse racing has a connection to this one horse that started everything.
  • More In related news, here are some thoughts on Horses are classified into ten different types.

Ponies Horse breeds that are often seen in the United States include as follows: Acronyms and abbreviations used for horse breeds Is one of these quickest horse breeds in your stable or on your equestrian trail?

Facts About Horse Flies

Horse flies (Tabanidae) are huge, aggressive insects that fly quite quickly. They are also highly spry flyers. Horse flies are among the biggest of all fly species, and there are around 3,000 different species of Horse flies in the globe. Females attack people and other animals (particularly horses and other livestock) in the hopes of obtaining blood meals for their young. Horse flies and Bot flies are referred to as “gadflies” in some circles. Horse flies might be a nuisance, but remember that you are not alone in feeling this way.

They were also a source of concern for the Vikings.

Continue reading for the most crucial facts about horse flies, as well as information on how to put preventative measures in place to keep you and your family safe from horse flies.

What Do Horse Flies Look Like?

Horse flies are available in a variety of colors ranging from yellowish-brown to dark grey to blackish in appearance, and they normally reach 3/4″ to 1.25″ in length. Their heads are disproportionately large in comparison to the rest of their bodies, and they are hairy all over, giving them a passing similarity to honey bees in appearance. They have just one set of wings, like all other genuine flies of theDipteraorder, which are delicately colored and covered with wispy dots, much like all other true flies of theDipteraorder.

Horse Flies vs. Deer Flies

Horse flies are frequently mistaken with Deer flies, which are also known to attack humans on a regular basis. Horse flies and Deer flies both have vividly colored eyes, however Deer flies are somewhat smaller than Horse flies. They are distinguished by the black stripes that run across their wings.

Where doHorse FliesCome From?

Aside from the polar extremes and few islands, such as Hawaii, horse flies may be found almost wherever on the planet, including the tropics. These fly prefer warm, wet environments where they may reproduce, although they can be found in a broad range of habitats, including deserts and alpine meadows, depending on the species. Horse flies are strictly outside creatures, and they do not feed or seek shelter indoors unless it is necessary. You may come across one who has mistakenly walked inside your home through an open window or door, in which case a flyswatter or a dependable indoor and outdoor fly spray will make fast work of it.

Horse Fly Habits

Most of the time, these flies may be found in valley meadows near creeks and streams, where they enjoy higher temperatures and more moisture, as well as regions where cattle and people can be located outside. Horse flies are not simply attracted to the open air (especially near pools of water, like mosquitoes). They also love bright sunshine and are most common throughout the summer months, and they seek to avoid dark, shaded regions when possible. Horse flies do not emerge from their lairs at night.

Females are the only ones who bite, as they have powerful, incisor-like mouthparts, whereas males have weak mouthparts, as shown in the photo.

Women (again, as is the case with mosquitoes) bite both animals and humans in order to collect protein in the form of a blood meal, which they use to fertilize eggs. During their development, horse fly larvae live in aquatic or semi-aquatic settings, where they prey on other smaller organisms.

What AttractsHorse Flies?

Female Horse flies can identify humans and animals by their colors and motions, and they are drawn to bright items, warmth, perspiration, and carbon dioxide emitted by humans and animals, among other things.

Can Horse Flies Bite?

Female horse fly bites are extremely painful, but what’s worse is that these insects have the ability to transmit germs and blood pollutants from one host to another. They have the potential to make animals and people severely ill, and in unsheltered cattle, they can even cause growth rates and milk supply to be lowered. If the person or animal who has been bitten has an allergy, the consequences are more severe. Blood-stained horse fly bites on people can cause rashes, dizziness, weakness, and wheezing, as well as other symptoms such as headaches and fatigue.

Likewise, scratching will exacerbate the itching and other side effects of mosquito bites.

Will Horse Flies Bite Your Dogs?

The scissor-like mouth of the female Horse fly can inflict painful bites not only on humans, but also on your dog. Even though the effects and minor irritation are only short-lived, your dog is still at risk for the same danger that comes with all biting pests: the spread of bacteria and other blood contaminants from the female Horse fly’s saliva. In addition to the belly, legs, and neck, larger dog breeds are the most prone to Horse fly attacks. The most common regions where dogs get attacked are the legs, abdomen, and neck.

TheHorse FlyLife Cycle

Female Horse flies deposit their eggs under gravel or plants in close proximity to a water source, but they do not need to be close to it. When the eggs hatch, the pale, spindly larvae crawl into a nearby body of water or moist soil, where they feed on tiny insects and even reptiles for the rest of their lives. When the horse fly larval stage is complete, it can continue up to a year, at which point the larvae burrow themselves into the earth in order to pupate. Horse flies mature after one to two weeks as pupae and another three to ten weeks as developing adults before emerging as fully fledged adults.

Helping Prevent a Horse Fly Problem Outdoors

Horse fly problems in suburban regions are less prevalent than in less-populated, rural locations, where there may be grassy, open fields and cattle in the vicinity. Ideally, pest control chemicals should not be utilized until all other options have been exhausted and the Horse fly problem has not been resolved. Citronella candles and ultraviolet bug zappers are two common cures for flies and other flying insects when used outdoors. Horse flies are not drawn to rubbish or animal corpses, but keeping your yard as clean of standing water as possible will help to keep them to a minimum (as well as mosquitoes, which are also attracted to standing water!)

Fly Killer Treatments

Products for Pest Control For spot-treatment of Horse flies, use a plant oil-based indoor fly killer such as Maggie’s Farm Home Bug Spray or Maggie’s Farm Flying Insect Killer, which are both highly effective. Plants despise flies and other insects just as much as you do, and the natural oils they create to defend themselves are incredibly powerful in killing and repelling insects of all kinds. If you want excellent personal protection against flies (and mosquitoes), use Maggie’s Farm Natural Insect Repellent, which is made from plant oils.

Always read and carefully follow the recommendations on the label of any pest control product, including those for storage and disposal.

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TryMaggie’s Farm pest control solutions for efficient fly control in your house that has been scientifically proven and is safe for your family and the environment.

In order to be the most effective, our plant and mineral-based treatments are created by scientists and experienced pest control specialists.

July Is a Glorious Month to Horseflies, Too (Published 2002)

See the article in its original context from July 21, 2002, SectionCN, Page14 of the New York Times Magazine. Purchase Reprints It is only available to home delivery and digital customers who have access to the TimesMachine. Residents, particularly those who are spending the weekend at the beach, have undoubtedly already noticed, but those pesky horseflies and deerflies will be at their worst from now until the end of the month. When they bite, they are the ones that make you jump out of your skin.

  1. Magnarelli, the state entomologist, who noted that this month has been no different from any other month this year in terms of complaints.
  2. They have a valid motive for doing so.
  3. Throughout all, there are around 50 different types in the state.
  4. They will automatically attempt to land on a person who has been swimming in the water.
  5. It is the females’ job to bite people and animals in order to obtain the blood they require for depositing their second batch of eggs for the year.
  6. It’s the greenhead horsefly, one of the worst and most prevalent bugs on the east coast, whose brightly colored eyes and aggressive nature afflict people from New Jersey to Cape Cod, to name a few places.
  7. On shore, he said that “they were biting us in the boat, and they were biting us in the boat.” In addition, he stated that there is “no effective means to regulate them.” “It has been attempted.
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In addition, they are too large to be destroyed by sprays.” Mr.

If the black-legged tick (also known as the deer tick) bites the same animal that the horseflies attack, it is possible that the deerflies are a part of a cycle that conveys a disease to the ticks, which in turn passes it to humans.

Magnarelli is collecting samples of deerflies this summer in order to conduct a research in which he aims to determine whether these flies are aiding in the transmission of the blood sickness human granulocytic ehrlichiosis to the microscopic ticks that carry the disease Lyme.

Every year in Connecticut, around 70 persons are infected with human granulocytic ehrlichiosis.

If the flies do really carry disease-causing chemicals, the deer they bite can transmit the disease to more ticks, which in turn can transmit the disease to humans.


He looks for highways that pass through forested, moist, or coastal locations, where the flies are likely to be waiting for their next meal.

They will follow you if you are running through the area.

He claims that certain horsefly species may wander up to a quarter-mile, whereas deerflies tend to stay close to the location where they were born.

Because cows, horses, and deer are less well-equipped to defend themselves against flies, flies frequently bite the legs of these huge species.

“I’ve seen them riding a horse,” I said.

The mouth parts of a mosquito may enter and puncture a capillary, while the mouth parts of a horsefly or a deerfly are saw-like in shape, making them less effective.

Horseflies and deerflies, as venomous as they may appear, play an important role in maintaining the balance of nature.

Their larvae resemble maggots, and they emerge as maggot-like larvae from eggs deposited the previous year each spring.

They even consume one another.

Then, while some types begin to fly around in late May and early June, the majority of them do not begin to fly until mid-July.

Afterwards, they begin biting in order to lay a second and, maybe, a third batch of eggs in order to reproduce.

He recommends that people follow the example of electrical lineman, who wear helmets that have been treated with bug repellant.

Just when some individuals are beginning to believe that the horseflies are no longer there, some of the largest and most obnoxious of them appear.

Fortunately, there aren’t as many of them as there used to be. In addition, the most essential thing to remember, according to Mr. Magnarelli, is that they “are not nearly as deadly as ticks.”

Horse Flies and Deer Flies

|Download the PDF version of ENTFACT-511: Horse Flies and Deer Flies.

by Lee Townsend, Extension EntomologistUniversity of Kentucky College of Agriculture

Horse Fly and Deer Fly are two types of flies. Horse flies and deer flies are both bloodsucking insects that may be a major annoyance to cattle, horses, and people. Horse flies and deer flies are both considered to be a serious pest to humans. Horse flies are around 3/4 to 1-1/4 inches in length and have transparent or strongly colored wings, as well as brilliantly colored eyes, in most cases. Deer flies, which are smaller than horse flies and regularly bite humans, have dark bands across their wings and colored eyes that are similar to those of horse flies.

  • The quantity of flies and the severity of their onslaught varies from one year to the next, depending on the season.
  • It is possible that animals will harm themselves when fleeing from the insects.
  • For their meal, Webb and Wells projected that horse flies would drink 1 cc of blood and that 20 to 30 flies dining for 6 hours would consume 20 tablespoons of blood, according to a USDA Bulletin 1218.
  • Flies such as horse flies and deer flies are more active during the daytime hours.
  • Once they have taken up residence on a host, they slit the skin with their knife-like mouthparts and feed on the blood pool that has formed.
  • The soreness and swelling caused by bites normally subside within a few days.
  • Bites may be painful, and general first aid-type skin lotions can assist to alleviate the discomfort.
  • In terms of animal pests, male flies are of no significance because they feed on nectar.
  • The fly’s painful bites usually provoke a response from the victim, and the fly is compelled to move on to another host as a result.


It is the muck around the borders of ponds and streams, as well as marshes and seepage sites, where horse fly and deer fly larvae grow and mature. Some are aquatic, while others grow in soil that is rather dry. Females lay batches of 25 to 1,000 eggs on vegetation that grows over water or in moist areas, depending on the species. They descend to the ground and feed on decaying organic debris as well as tiny creatures in the soil or water, which they acquire via this process.

The larval stage, which can last anywhere from one to three years depending on the species, is the most common. In order to pupate and eventually emerge as adults, mature larvae must crawl to drier locations.


During the summer, deer flies are generally only active for brief periods of time at a time. Repellents such as Deet and Off (N-diethyl-metatoluamide) can give up to several hours of protection when used outside. Follow the directions on the label since some people might develop allergies after using a product for a long period of time. Also, check for age limitations. Permethrin-based repellents are intended for use on clothes alone, however they often give a longer duration of protection than other repellents.

Even after a remedy has been administered, these flies will continue to swarm and annoy you.

Hats with mesh face and neck veils, as well as neckerchiefs, may provide some protection under severe circumstances.


Horse flies and deer flies may be a real annoyance when they congregate near swimming pools. They may be drawn to the water by the gleaming surface or by the movement of the swimmers in the water. There are currently no viable recommendations for addressing this issue. Permethrin-based sprays are approved for use on animals and horses, according to the label. Because these pesticides are extremely unpleasant to the flies, they are forced to flee nearly soon after landing on the surface. Frequently, the flies do not come into touch with the pesticide for long enough to be killed, and as a result, they continue to be an irritation.

It is possible that repeated applications will be required.

In addition, pyrethrin sprays are effective, although their effectiveness does not continue as long as permethrin.

In the daytime, if animals have access to shelter, they will be able to avoid the relentless onslaught of these vexing pests.


It is extremely difficult to detect and/or destroy the breeding sites of horse flies and deer flies, and it is nearly impossible to do so. The fact that they spawn in environmentally sensitive wetlands raises concerns about the implications of drainage or pesticide treatment on non-target creatures or water supplies. Furthermore, these insects are excellent flyers and have the ability to move in from a distance. Breeding sites may be quite large or located a long distance distant from the location where the issues are occurring.

Some changes in behavior or the use of repellents may be necessary to allow for enjoyment of the outdoors.


Some goods may not be legal to use in your state or nation, depending on where you live.

As a reminder, ALWAYS READ AND COMPLY WITH LABELED INSTRUCTIONS FOR SAFE USE OF ANY PESTICIDE! Images courtesy of the University of Kentucky Entomology Department

Are horsefly bites on the rise?

. or that it aided you in learning something entirely new. We’re wondering if you may be of assistance to us right now. Every year, an increasing number of individuals read our articles to learn about the issues that the natural world is experiencing. Despite the fact that our future is dependent on nature, we are not doing nearly enough to safeguard our life support system. The survival of British wildlife is in jeopardy. The creatures and flora that distinguish our island are fighting for their lives in an increasingly hostile environment.

  1. However, if we do not look after nature, nature will not be able to look after us.
  2. Despite the rising challenges, there is still reason to be optimistic.
  3. A place that encourages study, offers meaning, and provides hope for many, the Museum is a special place.
  4. We require the information gained via scientific discovery if we are to undo the damage we have already done and save the future.
  5. And you may provide a hand.
  6. Every donation to the Museum, no matter how large or little, is important to the work of nearly 300 scientists, who are dedicated to understanding and safeguarding the natural world.
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How to Identify a Horsefly Bite and What to Do Next

There’s a good chance you’ve been bitten by a horsefly more than once in your life. If you’re not familiar with this venomous bug, it’s a huge, black fly that may be rather annoying. Generally speaking, you can tell it apart by its size. In comparison to the typical fly, a horsefly may grow to be as long as 1 inch (2.54 cm), making it significantly bigger than the usual fly. Continue reading to learn what you should do if you get bitten by a horsefly. If you’ve ever been bitten by a horsefly, you understand how painful it can be.

The mandible is the insect’s jaw in its most basic form.

The horsefly’s mandible is additionally equipped with tiny hooks that aid in the horsefly’s ability to latch in and feed more effectively. Once the horsefly has been trapped, it begins to feed on the blood that has leaked from the skin. This bite has the potential to cause:

  • The biting location may be bruised in certain circumstances, and there may be an itching and inflammation surrounding the bite region.

Aside from the temporary discomfort they cause, horsefly bites are not considered to be hazardous to people in general. Horses are generally the only ones who suffer from these bites. This is due to the fact that horseflies are known to transmit equine infectious anemia, often known as swamp fever. When they bite an equestrian animal, they have the potential to spread this potentially fatal illness. If a horse becomes infected with the virus, it may endure fever, hemorrhaging, and overall sickness.

  1. Horseflies may be found all across North America, including Alaska.
  2. Some localities, particularly during the summer months, are plagued with horseflies, which are virtually inescapable in some areas.
  3. They prey on big creatures such as people, dogs, and, of course, horses, among other things.
  4. They’re also drawn to carbon dioxide, which makes sense.
  5. If you’ve ever had the impression that a horsefly was out for vengeance, you could be correct.
  6. If their first bite does not provide them with the gratifying feast they were looking for, they have been known to pursue after their prey for a brief period of time.
  7. The upper half of a horsefly is white, and it is usually distinguished by a few vertical black lines running vertically across it.

Using over-the-counter antiseptic spray or ointment, wipe the bite site and apply it to help keep the wound clean while also decreasing inflammation and itching The majority of the time, a horsefly bite will heal on its own within a few days.

Consult your doctor if you have any unexpected symptoms.

If you are having trouble breathing, have a rash that is spreading, or are experiencing increased discomfort, get medical treatment.

In the majority of cases, you will not suffer any negative side effects.

They will be able to analyze your bite and identify any necessary future actions.

Apply insect repellent before stepping outside to avoid being bitten by horseflies in the future. Wearing light-colored clothes is preferable if at all feasible. Horseflies are drawn to darker hues, therefore using a darker color may help keep them away from your home.

About Horseflies

Horsefly is the common English term for members of the Tabanidae family, which includes the horsefly. The terms ‘horse fly’ and ‘horse-fly’ are sometimes used interchangeably, and they are also known by other names in other parts of the world, including breeze flies, clegs or clags, deer flies, and gadflies. During the summer and fall months, adult horseflies are a nuisance to both cattle and their owners. The Tabanidae are genuine flies belonging to the insect order Diptera, which means “fly family.” A large number of tabanid species that attack humans and animals on a regular basis are classified as pests due to the bites they inflict as well as the illnesses and parasites that some of these species carry.

Males are unable to do so because they lack the same mouth pieces (mandibles) that females employ to take blood from their prey.

They are drawn to enormous, dark objects, as well as to particular animal odors and carbon dioxide, among other things.

Horsefly bites

The bite of a horsefly may be quite painful, especially when you consider how light, nimble, and flying the fly is in comparison to other insects. Female horseflies, in contrast to other insects that secretly penetrate the skin with needle-like organs, have particularly developed mouthparts that they utilize to rip and/or slice flesh apart. As the horsefly sucks it up, the blood begins to pour out of the bite wound. In addition to its unpleasant ability to land on the victim without being seen, the horsefly also has the capacity to flee as soon as the victim begins to feel any discomfort.

The bite of a horse fly is regarded to be more painful than the bite of a mosquito in the short term.

Horseflies are most active during the daytime hours in hot weather, which occurs mostly in the summer and fall.

Eggs are typically placed on stones near bodies of water, as well as on plant stems and leaves.

Effects and disease caused by Horsefly bites

Tabanidae are recognized to be vectors for a variety of blood-borne illnesses in both animals and humans, including the horse infectious anaemia virus and many Trypanosoma species, among others. They have also been linked to the transmission of anthrax among cattle and sheep, as well as the transmission of tularemia between rabbits and humans.

When huge flies are present in great numbers, blood loss is a regular concern in various species. Tabanid bites have been reported to cause animals to lose up to 300 mL of blood in a single day, which can cause them to become extremely weakened or even kill them.

Other insects

The H-trap will also catch other biting insects that respond in a similar manner to visual cues and are impacted by factors such as heat, movement, and carbon dioxide (CO2). Mosquitoes and the stable fly are among the insects on this list (Stomoxys calcitrans). Stable flies normally begin around the middle of spring, become severe in the early summer, and then gradually diminish in numbers for the remainder of the summer. Stable flies are similar in appearance to house flies, with the exception of the fact that stable flies have a bayonet-like mouthpart (proboscis) extending from the front of the head and they do not have the four black stripes on the thorax that are characteristic of house flies.

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In addition to piles of damp, rotting plant material (such as grass clippings or hay), piles of animal dung and urine should also be investigated as potential sources of stable flies.

Deer Flies and Horse Flies

When does a horse fly? Phil Pellitteri, University of Washington Insect Diagnostic Lab Revised:4/27/2004 XHT1049 is the item number for this item. In Wisconsin, there are approximately 30 species of blood-feeding deer flies (Chrysops) and horse flies (Tabanus, Hybomitra) that are known to feed on deer blood. They are members of the Tabanid family of flies, which includes a variety of species. From May through September, deer flies and horse flies can be seen in abundance. In the daylight, adult females feed on blood and may be seen in large numbers around swamps and marshes, along pond and stream banks, and at the edges of forested regions.

  1. In addition to being capable of flying considerable distances from their breeding places, tabanid adults will rest in thick grass or on leaves while they await the passing of their chosen hosts (big animals such as cattle, deer, humans, or dogs).
  2. Deer flies are somewhat bigger than house flies and feature dark patterns on their wings, which distinguish them from house flies.
  3. When it comes to adults, they are generally connected with degraded woodlots where they patrol the margins in quest of food.
  4. They are quite persistent, and they will frequently fly over a person’s head until they get an opportunity to bite him or herself.
  5. The smaller species are usually black or gray in appearance, with bright green eyes on a lot of them.
  6. A majority of Tabanids are found in wetlands in their immature phases.
  7. Unlike house fly maggots, larvae are active in moist or wet organic waste and can be either predators or vegetarians.

The majority of species have just one generation every year, while the bigger species might take up to two years to complete their growth and maturation.

In addition, the females have wide, blade-like mouth parts that inflict deep, agonizing wounds on their prey when they repeatedly stab them.

As a result of the hemorrhagic saliva injected into the bite site by the flies, some patients get fevers, severe sores, and allergic reactions.

These illnesses have not historically been a significant concern in Wisconsin, but diseases such as anthrax, tularemia, loiasis, and animal trypanosomes have been linked to deer and horse flies in other parts of the world, including the United States.

It is impossible and environmentally undesirable to treat breeding sites because of the wetland habitat that provides a safe haven for the larvae of these insects.

Fogging, or the application of aerosol insecticides, will only kill flies that are present at the time of treatment; however, more flies can migrate into an area in a matter of minutes after treatment is completed.

Standard insect repellents are only marginally effective in preventing mosquito bites.

Spinning around in a circle of flies or running away from them is counterproductive because these actions only serve to attract more flies.

The use of these products will reduce the number of flies on the person’s person, as well as the inconvenience of flies hovering around the head.

Insecticide sprays on animals are ineffective because the flies land on their hosts for such a brief period of time that contact insecticides do not have enough time to do their job effectively.

The Manning trap is comprised of a large, dark, beach ball-like object that is suspended from a rope by a single thread.

Allowing light to pass through the trap is essential.

The HORSE PAL horse fly trap from Newman Enterprises is an example of a commercial trap that makes use of this design (1-888-685-22444). Photographs Added to the Collection Trap for manning Article in PDF format

Horse Fly

Common Name Horse Fly
Scientific Name Tabanus sp.(Diptera: Tabanidae)
Size 2/3 inches long
Colour Yellow-white to pinkish thick, tough skin
  • Unlike honey bees, adult flies are dark and hairy, strong, and approximately 2/3-inch long, visually resembling them except for the fact that they have only one pair of wings instead of two. The horse bot fly’s wings have slight smoky patches on them, similar to those of a bat. Fully-grown larvae (maggots) are up to 2/3 inch long and have thick, tough skin that ranges from yellow-white to pinkish in color. A pair of powerful, hook-like mouthparts are present on one end (the rear) and a blunt end (the front) on the other (the front). A ring of strongspines surrounds each segment of the body. Several additional species of bot flies are seen on horses, including the chin flyorthroat bot fly, Gasterophilus nasalis(Linnaeus), and the lipornose bot fly, Gasterophilus haemorrhoidalis(Linnaeus) and the lipornose bot fly, Gasterophilus haemorrhoidalis(Linnaeus). Horse flies are distinguished in part by the form of their eggs
  • They eat by sucking blood and may produce a painful and severe bite if they bite the victim. These flying pests are closely related to Deer flies in both appearance and behavior. Horse flies are similar in appearance to Deer flies, but are slightly bigger in size. A dark pattern can be seen on the wings of this fly, and its body can be either brown or black in color. The female of the species feeds on animal blood, while the male of the species is a pollen collector. Horse flies lay their eggs in marshy places near bays, lakes, ponds, and swamps, where they hatch into adult flies. These flies have larvae that feed on insects and may be seen growing in wetlands
  • The female of the species feeds on animal blood, while the male of the species is a pollen collector. Horse flies lay their eggs in marshy places near bays, lakes, ponds, and swamps, where they hatch into adult flies. Insect-eating larvae of this fly can be seen growing in wetlands where they feed on insects.
  • Unlike honey bees, adult flies are dark and hairy, strong, and approximately 2/3-inch long, visually resembling them except for the fact that they have only one set of wings. Slight smokey patches may be seen on the wings of the horse bot fly. Large larvae (maggots) can grow to be up to two-thirds of an inch in length and have thick, tough skin that is yellow-white to pinkish. A pair of powerful, hook-like mouthparts are found on one end (the rear) and a blunt end (the front) on the other (the front). There are strongspines around each segment of the body. In addition to the chin fly or throat bot fly (Gasterophilus nasalis(Linnaeus)) and the lipornose bot fly (Gasterophilus haemorrhoidalis(Linnaeus), several additional species of bot insects are seen on horses. Horse flies are distinguished in part by the form of their eggs
  • They feed by sucking blood and can produce a painful and severe bite if they bite the victim repeatedly. A close relative of Deer flies, these flying pests are a nuisance in the woods. Horse flies are a bit bigger in size than Deer flies, which is why they are frequently misunderstood. The female of this species feeds on animal blood, whereas the male of the species is a pollen collector. The wings of this fly feature dark patterns, and their body is brown or black in color. Horse flies lay their eggs in marshy places around bays, lakes, ponds, and swamps, as well as in the surrounding vegetation. These flies have larvae that feed on insects and may be seen growing in wetlands
  • The female of the species feeds on animal blood, while the male of the species is a pollinator. Horse flies lay their eggs in marshy places around bays, lakes, ponds, and swamps, as well as in the surrounding vegetation. Insect-eating larvae of this fly may be seen growing in wetlands where they feed on them.
  • This species’ larvae grow in the digestive systems of host animals throughout the winter months. Host excrement is contaminated with full-grown larvae that are discovered in the late winter and early spring months. Once they have reached this stage (instar), they burrow into the earth and construct a puparium out of the larval skin from their previous stage. It takes 3 to 10 weeks for them to develop into adult flies within the puparium
  • Adults are active from mid-summer until the end of the summer season. Female horses glue eggs to their coats, notably the coats of their front legs, but also the coats of their belly, shoulders, and rear legs, according to adult females. Depending on the appropriate stimulation (moisture, heat, and friction) provided by the horse licking or chewing egg-infested hair, eggs can hatch in 10 to 140 days. The larvae of the first stage (instar) enter the mouth and burrow into the tongue for around 28 days before molting and traveling to the stomach, where they remain for 9 to 10 months, growing into the third stage after approximately 5 weeks of development. Every year, there is a new generation.
  • During the winter months, larvae grow in the digestive systems of host animals. The larvae are discovered in the feces of the hosts in the late winter and early spring months. As a result, they burrow into the earth and construct a puparium from the larval skin of their final stage (instar). It takes 3 to 10 weeks for them to develop into adult flies within the puparium
  • Adults are active from mid-summer to the end of the growing season. Female horses attach eggs to their coats, notably the coats of their front legs, but also the coats of their belly, shoulders, and rear legs. Depending on the appropriate stimulation (moisture, heat, and friction) provided by the horse licking or chewing egg-infested hair, eggs can hatch in as little as ten to one hundred and forty-four days. The larvae of the first stage (instar) enter the mouth and burrow into the tongue for around 28 days before molting and traveling to the stomach, where they will remain for 9 to 10 months, maturing into the third stage after approximately 5 weeks of development. Each year, there is just one generation.
  • Adult horse fly and deer fly larvae are very ferocious biters. They cause animals to lose weight and have the potential to spread illnesses such as anaplasmosis, anthrax, and others.
  • Because of the nature of this fly, it is hard to completely remove it by spraying operations. The Advantage Fly Trap is the only trap that has had any success with biting flies (such as the Horse fly and the Stable fly). However, the success has been limited in the past. In certain circumstances, the revolutionary technology of this product allows us to attract and trap blood-sucking flies for the first time, which is a first in the industry. Yet, the results vary depending on the species and location
  • However, this trap may capture a wide variety of flies. If Horse Flies are discovered within a building, make sure that all probable access routes have been removed. They will not be discovered reproducing indoors in the same way that a house fly would be. The most effective method of controlling flies is to eliminate all available breeding grounds and food sources. As evidenced by the horse fly’s biology, this form of fly control is nearly impossible with this particular species.

Horse Fly Control: Get Rid of Horse Flies in the House

  • Throughspraying programs are unable to completely remove this fly due to its biology. With biting flies (such as the Horse fly and the Stable fly), the Advantage Fly Trap is the only trap that has had any success
  • However, this success has been limited. For the first time, we are able to actually attract and trap blood-sucking flies using the innovative technology of this product, in some cases. The results vary depending on the species and location, but this trap is effective against a wide range of flies. If Horse Flies are discovered within a structure, make sure that all probable access holes have been sealed up. When compared to the house fly, they are less likely to be seen reproducing indoors. The most effective method of controlling flies is to eliminate all possible breeding grounds and feeding sites. As evidenced by the horse fly’s biology, this form of fly management is nearly impossible with this species.


The female horse fly, which feeds on blood, has blade-like mouthparts that cut tissues and blood arteries, causing blood to flow to the wounds they produce. Females then soaking up blood with their sponge-like mouthparts is what they are known for. Males solely eat on pollen and nectar, and their mouthparts are identical to females’, but considerably weaker.

Horse Fly vs. Deer Fly

Horse flies and deer flies are closely related, and both are members of the Tabanidae family. The two most distinguishing characteristics of them are their total size and the shape of their wings. Horse flies are often significantly bigger than other species, with a stouter body and a very massive head with extremely huge eyes. When it comes to their wings, they are often transparent or hazy, whereas deer flies have black bands or patches across their wings.


While male horse flies feed on pollen and plant nectars, female horse flies are aggressive blood feeders, whilst female horse flies do not.

Finding Prey

When it comes to finding hosts, female horse flies employ a combination of chemical and visual signals in the same way that other blood sucking insects do, such as mosquitoes. A long-range indication provided by warm-blooded animals attracts horse flies from a distance, whereas visual cues such as motion, size, form, and dark color attract horse flies from a shorter distance, according to the National Horsefly Association.


They hardly seldom bite close to the head. In addition to animals of practically all sizes, horse flies also have a wide range of hosts that include humans and their pets, as well as cattle. If a female horse fly is interrupted while attempting to feed, she will fly away but immediately return to bite another host, or she will proceed to another host to take a whole blood meal from that host.

Horse Fly Bites vs. Deer Fly Bites

Large, non-moving creatures are frequently bitten on the legs or torso by female horse flies. Deer flies, on the other hand, attack moving hosts and tend to target high-up on the body, such as the head or neck, to feed.


When someone is bitten, they may experience the following symptoms and bite reactions:

  • The bite area will swell and become itchy, then the swelling will subside. Itching and scratching of bite wounds that persists for an extended period of time and can result in subsequent bacterial infections if the bite is not cleaned and sanitized
  • The fact that horse flies inject anticoagulant-containing saliva while feeding on humans increases the risk of significant responses, particularly among those who are strongly sensitive to the anticoagulant chemicals. An itchy rash all over the body, wheezing, swelling around the eyes, swelling of the lips, and dizziness or weakness are all possible symptoms.

ReproductionLife Cycle

Horse fly growth areas include freshwater and saltwater marshes and streams, wet forest soils, and even rotting wood that has soaked up moisture from the environment. In most cases, females lay their egg masses on damp soil or vegetation that overhangs bodies of water. Larvae are active in organic stuff that is damp or wet, and they have a similar appearance to house fly maggots. Depending on the species, horse flies have anywhere from 6 to 13 larval stages. The pupal stage begins in the spring after the last larval stage has completed its overwintering period.

Fertile females will deposit their eggs on the undersides of leaves, and the larvae will hatch out and drop off the leaf in around 2-3 days after the eggs have been laid.

The majority of horse fly species produce just one generation each year, but some can take up to two years to complete their life cycle, according to the CDC.

Horse Fly Larvae vs. Deer Fly Larvae

During field study, researchers discovered that horse fly larvae prey on midges, crane flies, and even other horse fly larvae. As a result of their cannibalistic tendencies, horse fly larvae are typically seen living in isolation. Deer fly larvae, on the other hand, tend to congregate in large numbers. Pupae do not consume food. When it comes to producing viable fly eggs, female horse flies require a blood meal to be successful. A female can lay anywhere between 100 and 800 eggs every year.


Horse flies are present in nearly every region of the United States, and there are more than 160 different species to be found.

Prevention Tips

However, even the most potent insect repellents are only somewhat successful in keeping insects away. A better alternative for prevention is to cover and protect exposed areas of the body in order to lessen the probability of being bitten by horse flies.

It’s horsefly season and they feed off humans – how to treat their nasty bites

The recent mild weather may have been just what the doctor ordered for another year of vacationing at home, but the horseflies are taking advantage of the favorable conditions. The flies, which are also known as clegs, are found in grassland and woods and are capable of delivering a painful bite. Although horseflies are most commonly associated with horses and cows, they are also known to prey on humans and dogs as well as other animals. People are taking dinghies onto ‘hazardous’ North East reservoirs as a result of the heatwave, according to the BBC.

If you are unfortunate enough to get bitten by a horsefly, what should you do next is to seek medical attention.

What are horseflies and where do you find them?

It may be that the recent mild weather is perfect for spending another year at home, but the warmer temperatures also create excellent circumstances for horseflies to reproduce. The flies, which are also known as clegs, are found in grassland and woods and are known to bite viciously. Although horseflies are most commonly associated with horses and cows, they are also known to prey on humans and canines as well as livestock. individuals taking dinghies onto ‘hazardous’ North East reservoirs is causing a heatwave, according to the National Weather Service Northumberland Wildlife Trust states that horseflies may be seen between May and September, which implies we are now in the midst of horsefly season.

For the most part, you should be alright, but avoid scratching it, and keep an eye out for any attractive girls who may approach you.

Why do they bite?

The female flies require blood in order to be able to lay eggs and reproduce.

In addition to cutting skin with their sharp teeth, the flies also emit an anti-coagulant to prevent the blood from clotting while they are eating. The nectar is what the male flies eat.

How do I know If I’ve been bitten by a horsefly?

Your skin will get red around the bite region after it has injured you for the first time. A rash, dizziness, and weakness are all possible symptoms, according to the National Health Service. Some folks experience wheezing as well.

What should I do if I get bitten?

Maintain the cleanliness of the wound with antiseptic soap and warm water to prevent it from becoming infected. Aside from that, you won’t often be required to do anything. But if you develop indications of an infection, including pus or growing pain, redness, and swelling, you should see your doctor. Some people experience allergic responses, however this is an uncommon occurrence. Dizziness, wheezing, difficulty breathing, a blotchy skin rash, and significant swelling, which may be apparent in your lips or tongue, are all symptoms of a bacterial infection.

Also, refrain from itching the bite!

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Why Do Horseflies Bite, Will They Chase You? 7 Facts

Any links on this page that direct you to things on Amazon are affiliate links, which means that if you make a purchase, I will receive a compensation. Thank you in advance for your assistance — I much appreciate it! My next-door neighbor’s son just showed us his arm, which was covered with horsefly bites. He claims that if he goes within a mile of a horsefly, it chases him away. I was intrigued by his statement, and I began to wonder why horseflies bite and whether they actually do hunt people.

  • Protein is required for the development of their fertilized eggs.
  • And, sure, horseflies will hunt you down in order to acquire their food from your blood.
  • If you’ve ever been chased by horseflies, you’re well aware of how unpleasant the experience can be.
  • This is one of many questions I get asked about horse fly behavior, and this is one of the answers I provide.

Horsefly bites

Horsefly bites are painful and can result in swelling, itching, and a burning feeling. It’s also conceivable that a horsefly bite can leave a bruise on your skin. The good news is that horsefly bites do not usually result in long-term health problems in people. To make matters worse, horseflies are extremely deadly to horses because when they bite, they emit anticoagulants from their saliva, which helps to keep the blood flowing. Equine infectious anemia, which can be deadly in certain horses, can be carried and transmitted by saliva.

Why are horseflies so aggressive?

In addition to their aggressive attitude, horseflies are also notorious for their blood-feeding habits. Their hunger increases as a result of their exposure to humans and other animals, and their aggression increases as a result of their search for food. Female horseflies are active, flying around in search of blood meals that will offer the protein necessary for the growth of their fertilized eggs; male horseflies are passive, hanging out on flowers and other plants. As soon as a horsefly has selected a target, it uses its strong jaws to pull free skin and drain blood from the flesh of animals and people.

Furthermore, when horseflies bite people, they do not begrudge us their strength; they utilize the same biting force on us as they would on a thick-skinned animal.

Horsefly bites are extremely painful because of the power and tearing action of their teeth. In order to survive, male horseflies must feed on pollen from plants. They do not attack humans.

How do you keep horse flies from biting you?

In addition to their aggressive attitude, horseflies are notorious for their blood-feeding habits, which contribute to their reputation. Their hunger increases as a result of their exposure to humans and other animals, and their aggressiveness increases as a result of their food hunting. Female horseflies are active, flying around in search of blood meals that will give the protein necessary for the growth of their fertilized eggs; male horseflies are passive, hanging out on plants or in flowering shrubbery.

Considering that the vast majority of horsefly victims are cattle with thick skin, their bite must be quite strong.

Horsefly bites are very painful due to the power and tearing action of their teeth.

  • Comfort and fit were given a 1 rating. 70 percent UV protection is provided. Extra comfort is provided by a soft, sturdy, and breathable mesh cap. Hair is kept out of your horse’s eyes thanks to a patented forelock opening. A portion of the earnings from the sale of all fly masks with orange trim will be given to Benefit Animal Rescue. Size: Ears and nose are not included in this horse’s standard appearance.

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Can horse flies bite through clothing?

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Why do horseflies bite me and not others?

When it comes to horseflies, they are most active during their mating season, which occurs in the summer. And they always seem to bite the son of my next-door neighbor. Consequently, I was curious as to whether there is a reason why they bite certain people but not others. Horseflies are attracted to certain individuals more than others. Horseflies are attracted to humans by motion, dampness, dark hues, and specific fragrances. Horseflies are attracted to children and adults who are dressed in dark clothing, notably dark blues, moving fast, and sweating.

Horseflies will not regard two people in the same way if one is sitting peacefully and dressed in bright attire, and the other is rushing around sweating and clothed in a dark blue costume.

What do horse flies hate?

To battle horseflies efficiently, you must first understand your adversary. To put it another way, what do horseflies despise and will keep them away from your home? Do they have any particular odors or colors that they avoid? Horseflies are particularly attracted to some herbs, including eucalyptus, rosemary, basil, lemongrass, and clove.

It appears that they also avoid Avon Skin-So-Soft, as well as apple cider vinegar, white vinegar, and citronella. Some of these smells are used in commercial horsefly sprays, and they are quite efficient in keeping horseflies away from the horse.

Will horseflies chase you?

First and foremost, it is critical to emphasize the fact that horseflies are capable of chasing you down the street. When a female horsefly lights on you and is pushed off before it can complete its protein requirements, she will frequently return and attempt again. If you begin to move away from the house, the tenacious pest will pursue you. Horseflies are attracted to people for a variety of reasons other than the need to get blood. For starters, they are drawn to moving objects, particularly dark moving objects that are warm in temperature.

Horseflies are attracted to people who move around a lot because they see it as a constant.

I occasionally go for a run at a park that is surrounded by trees and has a pond in the middle.

After a while, I came across a group of walkers, and the horsefly opted to annoy them rather than bothering me.

During the hottest part of the day, their activity is heightened.

Moreover, based on my own running experience, I am aware that they want warm, sweaty bodies.

Generally speaking, pheromones are substances created and released into the air by animals or insects that have the ability to influence the behavior of other members of their species.

When a person is really involved in their workout, they may gallop by a few horseflies, and when the horseflies detect the aroma of pheromones and perspiration, they will take off after the individual.

You may, however, take precautions to reduce the likelihood of horseflies pursuing you.

If you find yourself being pursued by horseflies on a frequent basis, these suggestions are definitely worth considering.

Are horseflies good for anything?

Horseflies are known to carry lethal infections, agitate animals and people, and inflict a severe bite on their victims. Even the most little things in our lives, however, usually have some usefulness to them. So I was curious as to what advantages horseflies bring. Horseflies are harmful to everyone and everything.

You may use your creativity to make the case that they are a component of the environmental food chain. However, because it is used as a food source, its influence is minimal. Yes, horseflies are consumed by birds, but not in sufficient quantities to have a significant influence on their diet.

Where do horseflies live?

Horseflies are known to carry lethal infections, agitate animals and people, and inflict a severe bite on those who come into direct contact with them. However, even the most little things in our lives have some practical value. Consequently, I was curious as to what advantages horseflies provide. No matter what they do, horseflies are harmful. To be more imaginative, you might say that they are a component of the environment food chain. In terms of being a food supply, however, it has little influence.


Yes, and some DIY horse fly sprays are just as successful as commercial horse fly sprays in terms of reducing horse fly populations. Furthermore, most homemade fly sprays are both safer and less expensive to create than store-bought fly sprays. In this post, you will learn more about how to make your own horsefly spray.

Do you know why horses attract horseflies?

Flies are drawn to huge, warm, and dark moving things, mainly horses and cows, although humans dressed in black attire may suffice in some situations. If you want to learn more about what horses are attracted to, read the following article: What Causes Horses to Attract Flies? Number 2 Might Take You By Surprise

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