Types Of Flies In Kansas

Kansas farmers regularly deal with horn flies and stable flies that bother livestock throughout the growing season. Understanding the different Types Of Flies In Kansas helps you protect your animals, home, and family from these persistent pests. This guide covers the most common fly species you will encounter across the Sunflower State.

Kansas is home to a wide variety of fly species, each with unique habits and habitats. Some are just nuisances, while others can spread diseases or cause significant economic damage to livestock. Knowing which fly you are dealing with is the first step to effective control.

Horn Flies

Horn flies are tiny, about half the size of a housefly. They cluster on the backs and sides of cattle, feeding on blood multiple times a day. You will see them mostly during warm months, from late spring through early fall.

Size: 3-5 mm, smaller than a housefly
Color: Dark gray with two distinct stripes behind the head
Behavior: Stay on cattle almost constantly, only leaving to lay eggs in fresh manure
Damage: Cause weight loss, reduced milk production, and stress in beef and dairy herds

Control involves insecticide ear tags, pour-ons, and strategic manure management. Rotating chemical classes prevents resistance buildup.

Stable Flies

Stable flies look similar to houseflies but have a distinct, piercing mouthpart. They are aggressive biters that target the legs and bellies of livestock. Unlike horn flies, they feed intermittently and rest on fences, barn walls, or vegetation between meals.

Size: 5-7 mm, slightly larger than a housefly
Color: Gray with four dark stripes on the thorax and a checkerboard pattern on the abdomen
Behavior: Bite legs and lower body; prefer horses, cattle, and dogs
Damage: Cause stampeding, reduced feeding, and open wounds that attract other pests

Sanitation is key. Remove wet hay, spilled feed, and decaying organic matter where larvae develop. Traps and biological controls like parasitic wasps also help.

House Flies

House flies are the most familiar pest around homes and farms. They do not bite, but they are filthy. They feed on garbage, manure, and decaying matter, then land on your food or surfaces, spreading bacteria.

Size: 6-7 mm
Color: Gray with four dark stripes on the thorax
Behavior: Feed on liquid or semi-liquid substances; breed in moist organic material
Damage: Transmit diseases like Salmonella, E. coli, and dysentery

Keep kitchens clean, seal trash cans, and use fly screens on windows. Fly traps and UV light traps work well indoors.

Face Flies

Face flies are similar to house flies but slightly larger and darker. They feed on secretions around the eyes, nose, and mouth of cattle. This constant irritation can lead to pinkeye, a costly infection in herds.

Size: 7-8 mm
Color: Dark gray with a yellowish abdomen
Behavior: Cluster on animal faces, especially during sunny days
Damage: Spread Moraxella bovis bacteria, causing pinkeye and reduced weight gain

Control includes insecticide dust bags, face wipes, and fly tags. Pasture rotation and maintaining good herd health reduce susceptibility.

Horse Flies And Deer Flies

These large, painful biters are common near water sources and wooded areas in Kansas. Horse flies are bigger than deer flies, but both have scissor-like mouthparts that slice skin and feed on blood. They are relentless and can chase animals and people for long distances.

Horse fly size: 10-25 mm, with large eyes and clear or patterned wings
Deer fly size: 6-10 mm, with dark bands on the wings
Behavior: Active during daylight; attracted to movement, carbon dioxide, and dark colors
Damage: Cause severe pain, blood loss, and stress; can transmit anaplasmosis in cattle

Traps using black balls or sticky panels are effective. Repellents with DEET or permethrin help, but physical barriers like fly sheets for horses are best.

Blow Flies And Flesh Flies

Blow flies are metallic green or blue, while flesh flies are gray with three dark stripes. Both are attracted to dead animals, garbage, and open wounds. They are important decomposers but can cause myiasis (fly strike) in livestock.

Blow fly: Metallic sheen, loud buzzing, breeds in carrion
Flesh fly: Gray with checkerboard abdomen, gives live birth to maggots
Behavior: Lay eggs or larvae on dead tissue or soiled wool/hair
Damage: Infest wounds, cause secondary infections, and reduce wool quality in sheep

Promptly dispose of dead animals and treat wounds. Use wound dressings and insecticidal sprays to prevent infestations.

Mosquitoes

While not true flies, mosquitoes are often grouped with fly pests. Kansas has over 50 species, and they breed in standing water. They bite humans and animals, transmitting West Nile virus and heartworms in dogs.

Size: 3-9 mm, slender body with long legs
Color: Brown, gray, or black with white markings
Behavior: Females need blood for egg production; active at dawn and dusk
Damage: Itchy welts, disease transmission, reduced livestock productivity

Eliminate standing water in buckets, tires, and bird baths. Use larvicides in ponds and mosquito traps around barns.

Biting Midges (No-See-Ums)

These tiny flies are barely visible but their bites are extremely itchy. They breed in moist soil, mud, and organic debris. They are most active in early morning and evening during humid weather.

Size: 1-3 mm
Color: Gray or brown
Behavior: Swarm near water, feed on blood from mammals and birds
Damage: Cause allergic reactions in some people and animals; transmit bluetongue virus in sheep

Use fine-mesh screens and fans to keep them away. Insect repellents with picaridin or oil of lemon eucalyptus work well.

How To Identify Flies In Kansas

Identifying the exact species helps you choose the right control method. Start by looking at size, color, and where you find them. Biting flies usually have a sharp mouthpart, while non-biters have a sponging mouthpart.

Check the size: Tiny flies (under 5 mm) are likely horn flies or midges. Medium flies (5-8 mm) could be house flies, stable flies, or face flies. Large flies (over 10 mm) are horse flies or blow flies.
Look at color: Metallic green or blue means blow fly. Gray with stripes could be house fly or stable fly. Dark with yellow abdomen points to face fly.
Observe behavior: Do they bite? Where do they land? On cattle backs = horn flies. On legs = stable flies. On faces = face flies. Near garbage = house flies.
Check breeding sites: Manure piles, wet hay, dead animals, or standing water give clues.

Seasonal Patterns

Fly activity in Kansas peaks from May through September. Horn flies and stable flies emerge early, while horse flies and deer flies are most common in mid-summer. Face flies stay active until first frost. House flies breed year-round indoors if conditions allow.

Monitor fly populations weekly during warm months. Use sticky traps or count flies on animals to decide when to treat.

Impact On Livestock And Agriculture

Flies cost Kansas farmers millions each year. Horn flies alone can reduce weaning weights by 10-15% in calves. Stable flies cause cattle to bunch together, leading to heat stress and trampled pastures. Pinkeye from face flies can blind animals and require expensive treatment.

Dairy cows produce less milk when bothered by flies. Beef cattle spend less time grazing and more time swatting. Horses can develop summer sores from stable fly bites. Sheep are vulnerable to fly strike from blow flies.

Economic Thresholds

For horn flies, treatment is recommended when you count more than 200 flies per animal. For stable flies, the threshold is 5-10 flies per leg. Face flies become a problem when you see more than 10 per animal face. Monitoring helps you avoid unnecessary insecticide use.

Control Methods For Kansas Flies

Integrated pest management (IPM) combines multiple strategies for best results. Relying on one method often leads to resistance or incomplete control.

Cultural Controls

Manure management: Remove manure from barns and pens weekly. Spread it thinly on fields to dry out fly larvae.
Pasture rotation: Move cattle to fresh pastures every 2-3 weeks to break fly life cycles.
Sanitation: Clean up spilled feed, wet hay, and decaying vegetation. Fix leaky waterers.
Grazing management: Avoid overgrazing, which creates muddy areas where flies breed.

Biological Controls

Parasitic wasps: Tiny wasps that lay eggs inside fly pupae. Release them monthly during fly season.
Dung beetles: These beetles break down manure quickly, reducing fly breeding sites.
Predatory insects: Some beetles and mites eat fly eggs and larvae.

Chemical Controls

Insecticide ear tags: Effective for horn flies. Rotate between pyrethroid and organophosphate tags each year.
Pour-ons and sprays: Apply to cattle for horn flies, stable flies, and face flies. Follow label directions.
Dust bags and back rubbers: Place in gateways so cattle treat themselves.
Larvicides: Add to feed or water to kill larvae in manure. Use with caution to avoid resistance.

Physical And Mechanical Controls

Fly traps: Use sticky traps, bait traps, or UV light traps in barns and homes.
Fly screens: Install on windows and doors to keep flies out.
Fans: Air movement disrupts flying insects, especially stable flies.
Fly masks and sheets: Protect horses and cattle from face flies and biting insects.

Fly Control For Homes And Gardens

Flies also invade Kansas homes, especially during summer. House flies, blow flies, and cluster flies are common indoor pests. Cluster flies are larger and slower, often entering attics in fall to overwinter.

Prevention Tips

Seal cracks around windows, doors, and foundations. Use caulk or weather stripping.
Keep trash cans tightly covered and clean them regularly.
Pick up pet waste daily. Flies breed in dog and cat feces.
Compost properly: Turn piles frequently and cover fresh kitchen scraps with brown material.
Clean gutters and remove standing water from flower pots and bird baths.

Indoor Control

Use fly swatters or electric fly zappers for occasional flies. Sticky traps placed near windows catch many. For severe infestations, consider a professional pest control service. Avoid using outdoor foggers indoors.

Health Risks From Kansas Flies

Flies are more than just annoying. They can transmit pathogens that cause illness in humans and animals. House flies carry over 100 different disease organisms. Stable flies and horse flies can transmit blood-borne diseases.

Diseases Spread By Flies

Salmonellosis: From house flies contaminating food
E. coli: Spread through fly contact with manure
Pinkeye: Face flies spread bacteria between cattle
Anaplasmosis: Horse flies and deer flies transmit this blood parasite
West Nile virus: Mosquitoes spread this to birds, horses, and humans
Bluetongue: Biting midges infect sheep and deer

Protect yourself by using repellents, wearing long sleeves and pants outdoors, and keeping food covered. Wash hands after handling animals or working outside.

Frequently Asked Questions

What is the most common fly in Kansas?

The house fly is the most widespread species, found in homes, barns, and businesses across the state. However, horn flies are the most abundant on livestock.

How can I tell if a fly bites?

Look for a sharp, needle-like mouthpart (proboscis) that sticks out forward. Biting flies like stable flies and horse flies have this. House flies have a sponging mouthpart that looks like a pad.

Do flies in Kansas carry diseases?

Yes. House flies can spread foodborne illnesses like Salmonella and E. coli. Biting flies can transmit blood parasites and viruses to livestock and humans.

When is fly season in Kansas?

Fly activity starts in April or May and lasts until October or November. Peak populations occur in July and August.

What is the best fly control for cattle?

Integrated pest management works best. Combine insecticide ear tags, pour-ons, manure management, and biological controls like parasitic wasps. Rotate chemical classes to prevent resistance.

Final Thoughts On Managing Flies In Kansas

Kansas has a diverse range of fly species that affect both agriculture and daily life. By learning to identify the Types Of Flies In Kansas, you can target your control efforts more effectively. Start with sanitation and monitoring, then add chemical controls only when needed. This approach saves money, reduces chemical use, and keeps your animals and family comfortable.

Remember that fly populations can explode quickly in warm weather. Check your animals and property weekly during summer. Early action prevents small problems from becoming major infestations. With consistent effort, you can keep fly numbers manageable and enjoy a more pleasant environment on your farm or home.