How Do Big Flies Get in the House: A Comprehensive Guide

Big flies finding their way into your home can be a nuisance. This article from flyermedia.net explains why they might be invading your space and offers effective strategies to keep them out, ensuring a pest-free environment. Learn about fly behavior, entry points, and preventative measures, and gain actionable insights to safeguard your home. Discover the best pest control solutions, natural repellents, and DIY strategies for preventing fly infestations in the long term, ensuring your home remains a comfortable and hygienic space with practical tips on sanitation, sealing entry points, and utilizing fly traps.

1. What Are Cluster Flies and Why Are They in My House?

Cluster flies, often mistaken for common house flies, are similar in size but have distinct characteristics. They fly slower, typically toward windows on the sunny side of a building, and their wings overlap almost completely when at rest. These flies are prevalent in the northern US and other temperate regions, appearing indoors during the cooler months to overwinter.

Cluster flies should not be confused with other medium to large size flies which may appear suddenly. Those flies may appear when a small animal such as a mouse, rat, squirrel or bird dies within a wall, ceiling or floor void. You may or may not detect an odor. Such flies will find the hidden carcass and lay eggs on it. The eggs will hatch into larvae (maggots) which feed on the carcass. Soon, the larvae enter the pupae (cocoon) stage and then eventually hatch out as adults (flies), appearing around windows (just like cluster flies). This process may take from a few days to up to two weeks to complete and for the flies to stop appearing. Until then, open windows or doors to let the flies out or vacuum them up as needed.

Cluster flies, often seen gathering on window sills, seek warmth and light, particularly on sunny sides of buildings.

• Why They Appear: As fall approaches, cluster flies seek shelter from the cooling temperatures, entering homes and buildings in large numbers. They are drawn to west and south-facing buildings due to the warmth they provide.

• Entry Points: They enter through small cracks and crevices around window and door frames, as well as through open or unscreened windows and vents.

• Overwintering: Once inside, they congregate in secluded, safe places like attics or false ceilings to hibernate. These sites are typically on the upper south or west sides of buildings.

• Reactivation: When temperatures rise above 12 degrees Celsius, they become active. If the indoor temperature is consistently above this threshold, they may emerge, mistaking it for spring.

• Attraction to Light: Cluster flies are strongly attracted to light, so they are often found near windows and lamps, especially at night.

2. How Do Big Flies Like Blow Flies Enter Homes?

Blow flies, also known as carrion flies, are larger than house flies and often metallic blue or green. They are attracted to decaying organic matter and can enter your home in several ways.

The metallic green color of a blow fly is a key identifier, often indicating its presence due to decaying matter.

• Attraction to Odors: Blow flies have a keen sense of smell and are drawn to the scent of rotting food, garbage, or even dead animals. According to research from the University of California, Berkeley, in June 2023, blow flies can detect odors from up to several miles away, guiding them to potential breeding sites.

• Open Doors and Windows: Like cluster flies, blow flies can enter through open doors and windows, especially if there are no screens or the screens are damaged.

• Cracks and Crevices: They can also find their way in through small cracks in walls, gaps around pipes, and other structural openings.

• Indoor Breeding: Sometimes, blow flies might enter to lay eggs on a food source inside your home, such as meat left out on the counter or garbage that hasn’t been properly disposed of.

3. What Attracts Big Flies to My House in the First Place?

Several factors can make your home attractive to big flies. Understanding these attractants is crucial for preventing infestations.

• Food Sources: Flies are attracted to any readily available food source, including:

  • Garbage: Uncovered or overflowing garbage cans are a major attractant.
  • Pet Food: Leftover pet food can also draw flies.
  • Spills: Food and drink spills, especially sugary substances, are irresistible to flies.
  • Compost: Open compost bins near your house can be a breeding ground for flies.

• Moisture: Flies need moisture to survive and reproduce. Leaky pipes, damp basements, and standing water can attract them.

• Shelter: As mentioned earlier, cluster flies and other species seek shelter indoors during the cooler months to overwinter.

• Light: Some flies are attracted to light and may enter your home at night through open doors or windows.

• Decomposing Matter: The presence of dead animals, such as rodents or birds, inside walls or attics can attract blow flies and other scavengers.

4. What Are the Best Ways to Keep Big Flies Out of My Home?

Keeping big flies out requires a multi-faceted approach, including prevention, sanitation, and exclusion techniques.

• Seal Entry Points: Inspect your home for cracks and crevices, and seal them with caulk or weather stripping. Pay close attention to areas around windows, doors, pipes, and vents.

• Install and Repair Screens: Ensure that all windows and doors have screens, and repair any holes or tears. Screens are a simple but effective barrier against flies.

• Maintain Cleanliness: Regularly clean your home to eliminate food sources and breeding sites:

  • Garbage Disposal: Keep garbage cans tightly covered and empty them frequently. Clean garbage cans regularly to remove food residue.
  • Food Storage: Store food in airtight containers and clean up spills immediately.
  • Pet Areas: Clean pet food bowls and litter boxes regularly.
  • Compost Management: Keep compost bins away from the house and ensure they are properly maintained to minimize odors.

• Use Fly Traps: Several types of fly traps can help control fly populations inside your home.

• Professional Pest Control: For severe infestations, consider hiring a professional pest control service. They can identify the source of the problem and implement effective treatment strategies.

5. What Natural Fly Repellents Can I Use to Deter Big Flies?

If you prefer natural solutions, several plants and essential oils can help repel flies.

Fresh basil, alongside other herbs, serves as a natural deterrent to flies when placed near entry points.

• Plants:

  • Basil: Flies dislike the smell of basil. Place basil plants near doors and windows to deter them.
  • Lavender: Lavender is another effective fly repellent. Grow lavender in your garden or place dried lavender sachets indoors.
  • Mint: Mint plants can also help keep flies away.
  • Marigolds: Marigolds contain pyrethrum, a natural insecticide. Plant them around your home to repel flies and other insects.

• Essential Oils:

  • Peppermint: Peppermint oil is a strong fly repellent. Mix a few drops with water in a spray bottle and spray around your home.
  • Eucalyptus: Eucalyptus oil is another effective option.
  • Lemongrass: Lemongrass oil has a citrusy scent that flies dislike.
  • Clove: Clove oil can also be used to repel flies.

6. Are There Specific Types of Fly Traps That Work Best for Big Flies?

Several types of fly traps are effective for catching big flies. The best option depends on the type of fly and the location of the infestation.

• Sticky Fly Traps: These traps use a sticky surface to capture flies. They are best placed in areas where flies are frequently seen, such as near windows or garbage cans.
• Light Traps: These traps use ultraviolet light to attract flies, then electrocute or trap them. They are ideal for indoor use and are particularly effective for flies attracted to light.
• Bait Traps: Bait traps use a food-based lure to attract flies into a container, where they become trapped and drown. These traps are suitable for outdoor use or in areas with heavy fly infestations.

7. How Can I Prevent Big Flies From Breeding in My Yard?

Preventing flies from breeding in your yard is essential for long-term control.

• Remove Breeding Sites: Eliminate potential breeding sites by:

  • Cleaning Up Pet Waste: Regularly clean up pet waste, as it can attract flies.
  • Managing Compost: Ensure compost bins are properly maintained and covered.
  • Clearing Debris: Remove piles of leaves, grass clippings, and other organic debris that can serve as breeding sites.

• Maintain Proper Drainage: Ensure that your yard has proper drainage to prevent standing water, which can attract flies.

• Use Fly Larvicides: If you have areas where flies are breeding, such as stagnant ponds or manure piles, you can use fly larvicides to kill the larvae.

8. What Role Does Sanitation Play in Preventing Big Flies?

Sanitation is crucial in preventing fly infestations. By keeping your home and yard clean, you eliminate the food sources and breeding sites that attract flies.

• Regular Cleaning: Regularly clean your kitchen, bathrooms, and other areas where flies are likely to congregate.
• Proper Waste Management: Dispose of garbage properly and clean garbage cans regularly.
• Food Storage: Store food in airtight containers and clean up spills immediately.
• Pet Care: Clean pet food bowls and litter boxes regularly.
• Yard Maintenance: Keep your yard clean and free of debris.

9. How Do Weather Conditions Affect Big Fly Infestations?

Weather conditions can significantly impact fly populations.

• Warm Weather: Warm temperatures accelerate the fly life cycle, leading to rapid population growth.
• Rainfall: Rainfall can create breeding sites by providing standing water.
• Drought: Drought conditions can concentrate flies around available water sources.
• Seasonal Changes: As mentioned earlier, cluster flies seek shelter indoors during the cooler months to overwinter.

10. What Are Some Common Misconceptions About Big Flies?

Several misconceptions exist about big flies and how to deal with them.

• Myth: Flies Are Only Attracted to Dirty Homes: While cleanliness is important, flies can be attracted to any home with available food sources or breeding sites, regardless of how clean it is.
• Myth: One Fly Isn’t a Big Deal: Even one fly can lay hundreds of eggs, leading to a rapid infestation if left unchecked.
• Myth: Flies Only Live for a Day: While some flies have short lifespans, others can live for several weeks or even months.

Addressing these misconceptions can help you take proactive steps to prevent fly infestations.

11. How Can Flyermedia.net Help Me with My Aviation Interests?

While this article focuses on pest control, flyermedia.net offers a wealth of information for aviation enthusiasts, pilots, and those considering a career in the aviation industry.

• Pilot Training Information: Flyermedia.net provides comprehensive information on flight schools, certifications, and aviation regulations. If you’re looking to become a pilot, this is a great place to start your research.
• Aviation News and Trends: Stay up-to-date with the latest news, trends, and technologies in the aviation industry.
• Career Opportunities: Explore various career paths in aviation and find resources to help you succeed in this exciting field.

12. What Are the Differences Between House Flies and Other Large Flies?

While this article has explored cluster flies and blow flies, understanding the differences between house flies and other large flies is useful for effective pest management.

• House Flies (Musca domestica):

  • Size: Medium-sized, typically 4-7 mm long.
  • Color: Grayish-black with four dark stripes on the thorax.
  • Habitat: Commonly found around humans, feeding on garbage, food waste, and animal excrement.
  • Behavior: Known for transmitting diseases due to their unsanitary habits.

• Cluster Flies (Pollenia rudis):

  • Size: Slightly larger than house flies, about 8-10 mm long.
  • Color: Dark gray with golden hairs on the thorax.
  • Habitat: Breed in the ground, using earthworms as a food source for larvae. Overwinter in buildings.
  • Behavior: Fly slowly and clumsily, often found near windows. Not known to transmit diseases.

• Blow Flies (Calliphoridae family):

  • Size: Larger than house flies, typically 8-12 mm long.
  • Color: Metallic blue, green, or black.
  • Habitat: Attracted to decaying organic matter, such as carrion and garbage.
  • Behavior: Important decomposers in the ecosystem but can be a nuisance and health hazard in homes.

• Fruit Flies (Drosophila melanogaster):

  • Size: Small, typically 3-4 mm long.
  • Color: Brown or yellowish-brown with red eyes.
  • Habitat: Attracted to overripe fruit, fermenting liquids, and other sugary substances.
  • Behavior: Common pests in kitchens and food storage areas.

13. What Are the Potential Health Risks Associated with Big Flies?

Big flies can pose several health risks due to their ability to transmit pathogens.

• Disease Transmission: Flies can carry bacteria, viruses, and parasites on their bodies and legs, which they can transfer to food and surfaces.
• Food Contamination: Flies can contaminate food with their saliva and feces, leading to food poisoning and other illnesses.
• Allergies: Some people are allergic to fly saliva or feces, which can cause skin irritation and respiratory problems.
• Myiasis: In rare cases, flies can lay eggs on open wounds or sores, leading to myiasis, where the larvae feed on living tissue.

The illustration highlights the transmission of pathogens by flies, emphasizing the need for sanitation and prevention.

14. How Can I Identify Different Types of Big Flies in My Home?

Identifying the type of fly in your home is essential for effective pest management. Here’s a guide to help you distinguish between common types:

Fly Type	Size	Color	Habitat	Behavior
House Fly	4-7 mm	Grayish-black	Around humans, garbage, food waste, animal excrement	Transmits diseases, unsanitary habits
Cluster Fly	8-10 mm	Dark gray, golden hairs	Breeds in ground, overwinters in buildings	Slow-flying, found near windows, doesn’t transmit diseases
Blow Fly	8-12 mm	Metallic blue, green, black	Decaying organic matter	Important decomposer, nuisance and health hazard in homes
Fruit Fly	3-4 mm	Brown/yellowish-brown	Overripe fruit, fermenting liquids	Pests in kitchens, food storage areas
Drain Fly	1.5-5 mm	Gray/brown	Drains, sewers, damp areas	Breeds in stagnant water, can indicate plumbing issues
Flesh Fly	10-14 mm	Gray with stripes	Carrion, decaying flesh	Similar to blow flies, attracted to decaying matter
Stable Fly	5-7 mm	Grayish-brown	Livestock areas, stables	Bites animals and humans, feeds on blood
Horse Fly	10-25 mm	Gray/black	Open fields, near water	Bites animals and humans, painful bite
Moth Fly	1-5 mm	Brown/gray	Drains, sewers, damp areas	Often mistaken for moths, breeds in standing water
Crane Fly	Up to 25 mm	Brown/gray	Damp areas, lawns	Resembles large mosquitoes, larvae feed on plant roots
March Fly	7-15 mm	Black/brown	Grassy areas, meadows	Can be a nuisance in large numbers, larvae feed on plant roots

This table should help you identify the types of flies you are seeing and better target your control methods.

15. What Are the Best Commercial Fly Sprays and Insecticides?

If natural methods are not sufficient, commercial fly sprays and insecticides can be effective. Here are some options to consider:

• Pyrethrin-Based Sprays: Pyrethrins are natural insecticides derived from chrysanthemum flowers. They are effective against a wide range of insects, including flies.
• Permethrin-Based Sprays: Permethrin is a synthetic insecticide that is similar to pyrethrins. It has a longer residual effect than pyrethrins.
• Cyfluthrin-Based Sprays: Cyfluthrin is another synthetic insecticide that is effective against flies. It has a long residual effect and is often used for outdoor applications.
• Insect Growth Regulators (IGRs): IGRs disrupt the development of fly larvae, preventing them from maturing into adults. They are often used in conjunction with other insecticides.

Note: Always follow the manufacturer’s instructions when using commercial fly sprays and insecticides. Take precautions to protect yourself, your family, and your pets from exposure to these chemicals.

16. How Can I Get Rid of Flies That Are Already Inside My House?

Getting rid of flies that are already inside your house requires a combination of methods.

• Fly Swatters: Fly swatters are a simple and effective way to kill individual flies.
• Vacuum Cleaner: Use a vacuum cleaner to suck up flies that are resting on walls or ceilings.
• Fly Traps: Place fly traps in areas where flies are frequently seen.
• Insecticide Sprays: Use insecticide sprays to kill flies in infested areas.
• Professional Pest Control: For severe infestations, consider hiring a professional pest control service.

17. What Are the Signs of a Fly Infestation?

Recognizing the signs of a fly infestation can help you take action before the problem gets out of control.

• Seeing Flies: The most obvious sign of a fly infestation is seeing flies in your home.
• Fly Specks: Fly specks are small, dark spots of fly feces that can be found on walls, ceilings, and other surfaces.
• Maggots: Maggots are fly larvae that are often found in garbage cans, compost bins, and other areas with decaying organic matter.
• Pupae: Pupae are the cocoon-like stage of fly development. They are often found in secluded areas, such as cracks and crevices.

18. What are the best practices for dealing with dead animals attracting flies?

Dealing with dead animals attracting flies requires a swift and thorough approach to prevent infestations and unpleasant odors.

• Locate the Source: First, identify the location of the dead animal. Common places include attics, walls, crawl spaces, and under decks. Odor can often guide you, but be prepared to investigate thoroughly.
• Protective Gear: Wear gloves, a mask, and protective clothing to avoid direct contact with the carcass and any potential pathogens or parasites.
• Removal: Carefully remove the dead animal. If it’s in a difficult-to-reach area, you may need to cut into a wall or floor. Consider hiring a professional for this task to minimize the risk of exposure to contaminants.
• Disposal: Place the carcass in a sealed plastic bag. Check local regulations for proper disposal methods, which may include burial or disposal with regular trash.
• Clean and Sanitize: Thoroughly clean the area where the animal was found with a disinfectant or a bleach solution (1 part bleach to 10 parts water). Pay attention to any surfaces that may have been contaminated.
• Odor Control: Use odor absorbers like baking soda, activated charcoal, or commercial odor eliminators to neutralize any lingering smells. Air out the area by opening windows and using fans.
• Pest Control: Apply insecticides or fly traps to control any remaining flies or maggots. Focus on areas where they are most likely to be present.
• Preventative Measures: Seal any entry points (cracks, holes) to prevent future infestations. Consider using wire mesh to cover openings that animals might use to enter.
• Professional Help: If the infestation is severe or the animal is difficult to remove, consult with a pest control professional. They have the tools and expertise to handle the situation safely and effectively.

19. How Can I Prevent Big Flies in Commercial Settings?

Preventing big flies in commercial settings, such as restaurants and food processing plants, is crucial for maintaining hygiene and preventing food contamination.

• Implement Strict Sanitation Practices:
  • Regular Cleaning: Clean all surfaces, equipment, and floors regularly with appropriate disinfectants.
  • Proper Waste Management: Use tightly sealed garbage containers and empty them frequently. Clean garbage containers regularly.
  • Food Storage: Store food in airtight containers and rotate stock to prevent spoilage.
  • Grease Management: Properly dispose of grease and clean grease traps regularly.
• Maintain Structural Integrity:
  • Seal Entry Points: Seal cracks, crevices, and gaps around windows, doors, and pipes.
  • Install and Maintain Screens: Ensure all windows and doors have screens, and repair any damage promptly.
  • Air Curtains: Install air curtains at entrances to prevent flies from entering.
• Use Professional Pest Control Services:
  • Regular Inspections: Schedule regular pest control inspections to identify and address potential problems.
  • Integrated Pest Management (IPM): Implement an IPM program that combines preventive measures, sanitation practices, and targeted pesticide applications.
• Train Employees:
  • Hygiene Practices: Train employees on proper hygiene practices, including handwashing and food handling procedures.
  • Fly Control Procedures: Educate employees on how to identify and report fly infestations and how to use fly control products safely.
• Monitor and Document:
  • Fly Activity: Monitor fly activity and document any sightings.
  • Control Measures: Keep records of all fly control measures taken, including pesticide applications and sanitation efforts.

20. What Role Do Drain Flies Play in Overall Fly Infestations?

Drain flies, also known as moth flies or sewer flies, are small, fuzzy flies that breed in drains, sewers, and other areas with stagnant water. While they are not as directly associated with food contamination as house flies or blow flies, they can contribute to overall fly infestations and indicate underlying sanitation problems.

• Breeding in Stagnant Water: Drain flies lay their eggs in the gelatinous film that forms on the inside of drains and pipes. This film is composed of bacteria, fungi, and other organic matter.
• Indicator of Sanitation Issues: The presence of drain flies often indicates that there is a buildup of organic matter in your drains or pipes.
• Nuisance Pest: While drain flies do not typically bite or transmit diseases, they can be a nuisance due to their presence in large numbers.
• Control Measures: To control drain flies, you need to eliminate their breeding sites by cleaning your drains and pipes.

Here are some steps you can take to control drain flies:

1. Clean Drains: Use a drain brush or snake to scrub the inside of your drains and pipes.
2. Use Drain Cleaners: Use a drain cleaner that contains enzymes or bacteria to break down organic matter.
3. Pour Boiling Water: Pour boiling water down your drains to kill fly larvae and eggs.
4. Monitor and Repeat: Monitor your drains for fly activity and repeat these steps as needed.

By implementing these comprehensive strategies, you can effectively manage and prevent big fly infestations in your home or commercial setting.

Conclusion

Dealing with big flies in the house requires a proactive and comprehensive approach. By understanding what attracts these pests, sealing entry points, maintaining cleanliness, and utilizing natural repellents and traps, you can keep your home free from unwanted guests. For those interested in aviation, flyermedia.net is a valuable resource for pilot training information, aviation news, and career opportunities. Fly high and keep your home fly-free with these tips. Visit flyermedia.net for more information on aviation careers, training and news. Our Address is 600 S Clyde Morris Blvd, Daytona Beach, FL 32114, United States. You can call us at +1 (386) 226-6000.