(844) 211-7378Book Inspection
deer flies

Deer Flies

calendar icon in blue

Free Quote

Request A No Obligation Quote

What Are Deer Flies?

Deer flies (Chrysops spp.) are a group of blood-feeding flies belonging to the family Tabanidae. They are commonly found in various parts of North America, Europe, and other regions with temperate climates. Deer flies are known for their painful bites and can be a nuisance to both humans and animals.

  • Biology: Deer flies are medium-sized flies, typically measuring 1/4 to 1/3 inch in length. They have stout bodies, clear wings, and prominent, often patterned, dark bands on their wings and abdomen. Their characteristic features include large, colorful compound eyes, which are well-developed for visual navigation. Deer flies exhibit sexual dimorphism, with females being the blood-feeding sex, while males primarily feed on nectar and pollen. Female deer flies require blood meals for egg development.

  • Habitat and Distribution: Deer flies are typically found in wooded or forested areas near water sources such as ponds, streams, and lakes. They are most active during the warm months of the year, from late spring to early autumn. Deer fly species may vary in their geographic distribution, but they are commonly encountered in North America, particularly in the eastern United States and parts of Canada, as well as in Europe.

  • Behavior: Deer flies are known for their aggressive feeding behavior. Female deer flies are attracted to their hosts by visual cues, such as movement and color, as well as the carbon dioxide and heat emitted by warm-blooded animals. They use their sharp, scissor-like mouthparts to lacerate the skin and feed on the blood. This feeding process is often painful and can result in red, itchy welts.

  • Deer flies are diurnal insects, which means they are most active during daylight hours. They are agile fliers and can be persistent in their pursuit of a blood meal. After feeding, female deer flies seek suitable locations to lay their eggs near water or moist areas.

  • Life Cycle: The life cycle of deer flies typically consists of four stages: egg, larva, pupa, and adult. Females lay their eggs near water or damp soil, where the larvae hatch and develop. The larval stage of deer flies is aquatic or semi-aquatic, with the larvae preying on smaller invertebrates. After pupation, the adult flies emerge and begin their quest for blood meals to reproduce.

  • Management and Control: Controlling deer flies can be challenging due to their persistence and aggressive feeding behavior. Some strategies for managing deer flies include wearing protective clothing, such as long-sleeved shirts and pants, and using insect repellents on exposed skin. Physical barriers like head nets and screened-in areas can also help prevent deer fly bites. Additionally, reducing breeding sites near water sources can limit the population of these pests.

Deer flies are a group of blood-feeding flies known for their painful bites and aggressive feeding behavior. They are found in wooded areas near water sources and are most active during warm months. Understanding their biology, habitat, behavior, and management strategies is essential for mitigating the annoyance and discomfort they can cause to humans and animals in affected regions.

Yellow Flies

Deer flies (Chrysops spp.) exhibit some variation in coloration, but they typically have specific characteristics that help identify them. The coloration of deer flies can include:

  • Dark and Banded: Deer flies often have dark-colored bodies with prominent, often patterned, dark bands on their wings and abdomen. These bands can vary in color, but they are typically dark brown or black. The exact pattern may differ among species, but these bands are a distinguishing feature of deer flies.
  • Shiny and Metallic: Some deer fly species have a shiny and metallic appearance, with colors ranging from metallic green to bronze or copper tones. This iridescent quality can be particularly noticeable in certain lighting conditions.
  • Large Compound Eyes: One of the striking features of deer flies is their large, colorful compound eyes, which can vary in color but often have a metallic or colorful sheen. These eyes are well-developed for visual navigation.
  • Variable Abdominal Colors: While the abdomen of deer flies is often dark with distinct bands, the specific coloration can vary among species and even within the same species. Some may have a reddish or brownish hue on the abdomen.

The exact coloration of deer flies can vary based on the species, geographic location, and even individual variations. However, the presence of dark bands on their wings and abdomen, combined with their large, colorful eyes, makes them relatively distinctive compared to other fly species. These characteristics are helpful for identifying deer flies in their various habitats.

Biting Yellow Flies

Deer fly bites can be a significant nuisance and source of discomfort for those who encounter these blood-feeding insects.

Deer Fly Bites:

  • Painful Bites: Deer fly bites are known for their painful nature. When a female deer fly lands on a host and bites, it uses scissor-like mouthparts to lacerate the skin and feed on blood. This action can result in an immediate sharp, stabbing pain at the bite site.
  • Quick Feeding: Deer flies are efficient feeders, and their bites are often quick. They take a small amount of blood in a short amount of time and then depart.
  • Itching and Swelling: After a deer fly bite, the affected area may become red, swollen, and itchy. The intensity of the itching and swelling can vary from person to person.
  • Welt Formation: In some cases, deer fly bites can lead to the formation of welts or raised, red, and inflamed bumps on the skin. These welts can be particularly uncomfortable and may persist for several days.

Symptoms and Complications:

While deer fly bites are generally not associated with severe medical complications, they can cause discomfort and potential secondary issues, such as:

  • Itchiness: The itching sensation at the bite site can be intense and may lead to scratching, which can increase the risk of infection.
  • Allergic Reactions: Some individuals may be allergic to deer fly saliva, which can result in more pronounced skin reactions, including larger welts and increased itching.
  • Infection: Scratching the bite area with dirty hands or nails can introduce bacteria, leading to a secondary skin infection.

Deer Fly Bite Treatment:

Treatment for deer fly bites focuses on relieving symptoms and preventing infection. Here are some recommended steps:

  • Wash the Bite Area: Clean the bite area with mild soap and water to reduce the risk of infection. Avoid excessive scrubbing, which can irritate the skin further.
  • Topical Anti-Itch Creams: Over-the-counter anti-itch creams or ointments containing ingredients like hydrocortisone can help alleviate itching and reduce inflammation.
  • Cold Compress: Applying a cold compress to the affected area can provide temporary relief from pain and swelling.
  • Oral Antihistamines: Over-the-counter oral antihistamines, such as diphenhydramine (Benadryl), can help relieve itching and reduce allergic reactions.
  • Avoid Scratching: It's crucial to resist the urge to scratch the bite, as this can worsen the irritation and increase the risk of infection.
  • Seek Medical Attention: If you experience severe allergic reactions, signs of infection (increased redness, warmth, or pus), or if symptoms persist or worsen, consult a healthcare professional.

How To Prevent Deer Fly Bites:

Preventing deer fly bites is essential for avoiding the discomfort they cause. Here are some preventive measures:

  • Protective Clothing: Wear long-sleeved shirts, long pants, and socks to minimize exposed skin.
  • Insect Repellent: Apply an insect repellent containing DEET or picaridin to exposed skin and clothing.
  • Head Nets: When in areas with a high population of deer flies, consider wearing a head net to protect the face and neck.
  • Avoid Peak Activity Times: Deer flies are most active during daylight hours, so planning outdoor activities during the early morning or late afternoon when they are less active can help reduce encounters.
  • Stay Away from Breeding Sites: Avoid areas near water sources where deer flies breed, especially during their peak breeding seasons.

Deer fly bites are known for their painful and itchy nature. While they are generally not dangerous, they can cause discomfort and potential complications. Prompt treatment and preventive measures can help mitigate the effects of deer fly bites and reduce the likelihood of encountering these pests.

Repelling Deer Flies

Repelling deer flies can be essential to avoid their painful bites and reduce the discomfort they cause. Here are some methods and products that can effectively repel deer flies:

Insect Repellents:

  • DEET-Based Repellents: DEET (N,N-Diethyl-meta-toluamide) is a highly effective insect repellent. Products containing DEET are widely available and can provide long-lasting protection against deer flies. Apply DEET-based repellents to exposed skin and clothing according to the product's instructions.
  • Picaridin-Based Repellents: Picaridin is another effective alternative to DEET. It is odorless, non-greasy, and suitable for use on the skin and clothing. Picaridin repellents are available in various formulations.
  • Permethrin-Treated Clothing: Permethrin is a repellent that can be applied to clothing, including hats and shirts. It provides excellent protection when deer flies come into contact with treated fabric. Follow the application instructions on the product label.

Protective Clothing:

  • Wear Long-Sleeved Shirts and Pants: Cover as much skin as possible with clothing to minimize exposed areas where deer flies can bite.
  • Tuck Clothing In: Tuck pants into socks and shirts into pants to create a barrier that makes it more challenging for deer flies to access your skin.
  • Head Nets: Consider using a fine mesh head net that covers your head, neck, and face. This is particularly effective in preventing deer fly bites on these highly vulnerable areas.
  • Beekeeper Suits: In extreme cases or for outdoor work in heavily infested areas, some people opt to wear beekeeper suits, which provide full-body protection against deer flies.

Avoid Peak Activity Times:

  • Deer flies are most active during daylight hours, so if possible, plan outdoor activities during the early morning or late afternoon when their activity is reduced.

Choose the Right Locations:

  • When hiking or spending time outdoors, avoid areas near water sources where deer flies often breed and congregate.

Fans and Wind:

  • Deer flies are not strong fliers, and they tend to avoid windy conditions. Using fans or creating airflow in outdoor spaces can help deter them.

Homemade Remedies:

  • Some individuals have reported success with homemade repellents using natural ingredients like essential oils. Common choices include lemon eucalyptus oil, lavender oil, and citronella. However, the effectiveness of these remedies may vary, and they typically offer shorter-lasting protection than commercial repellents.

Stay Still and Calm:

  • When a deer fly lands on you, try to remain still and calm. Swatting or trying to brush it away can trigger its aggressive feeding behavior. Once it lands, gently and slowly remove it.

Seek Professional Advice:

It's important to choose repellents and protective measures that are suitable for your specific situation and comfort. Additionally, always follow the manufacturer's instructions for proper application of repellent products. By taking these preventive steps, you can significantly reduce the likelihood of deer fly bites and enjoy outdoor activities more comfortably.

Request Your Free Inspection

Complete the form below to request your free inspection.

Latest Blog Posts


What You Should Know About Maggots

January 10, 2024

what do termites look like

What Do Termites Look Like?

January 09, 2024